Methodology

Compound Interest Calculator

Not modeled

• Returns are modeled as a smooth constant rate. Real markets deliver an average made of very good and very bad years, and the order those arrive in changes the outcome — especially once you start withdrawing.
• Results are nominal unless you use the inflation field. A projection showing $1,000,000 in thirty years describes dollars that will buy considerably less than $1,000,000 buys today.
• No taxes are applied. What you actually keep depends on whether the money sits in a taxable brokerage account, a traditional 401(k), or a Roth, and those three produce very different after-tax results from the same balance.
• Investment fees are not deducted. An expense ratio of 0.5% a year compounds against you exactly the way returns compound for you.

Dividend Calculator

Not modeled

• Dividend yield and growth are assumptions you supply. Companies cut dividends, and unusually high yields are frequently a symptom of a falling share price rather than an opportunity.
• Taxes are not applied. Qualified dividends get long-term capital gains rates; non-qualified dividends, including most REIT distributions, are taxed as ordinary income.
• A dividend is not free money — the share price adjusts downward by roughly the dividend amount on the ex-dividend date. Reinvesting converts value that left the price back into shares.
• It models a single yield for the whole portfolio. Real holdings pay at different rates and on different schedules.

Common questions

How much capital do I need to live off dividends?

Annual spending divided by portfolio yield. At a 3% yield, $60,000 of spending requires $2,000,000. The temptation is to solve the size problem by assuming a higher yield, which usually means accepting concentration or credit risk rather than genuinely needing less capital.

What yield is realistic?

A broad US stock index has generally yielded 1% to 2% in recent decades. A dividend-focused portfolio might reach 3% to 4% without reaching for distressed payers. Above roughly 5% to 6% you are usually being paid for a specific risk.

Are dividends taxed differently from other income?

Qualified dividends are taxed at long-term capital gains rates, which for 2026 are 0% on taxable income up to $49,450 single and $98,900 married filing jointly, then 15% and 20%. Non-qualified dividends are taxed as ordinary income.

Should I reinvest dividends?

In a tax-advantaged account, reinvesting compounds without any annual tax event. In a taxable account the dividend is taxable whether or not you reinvest, so reinvesting defers nothing — though it does raise your cost basis, which reduces the eventual capital gain.

FIRE Calculator

Not modeled

• It uses a fixed withdrawal rate. The research behind the 4% rule tested 30-year retirements against US historical returns — a 50-year early retirement is outside what it examined, which is why 3% to 3.5% is common for very early targets.
• No taxes are applied to withdrawals. Money in a traditional 401(k) or IRA is taxed as ordinary income when withdrawn, so the gross amount you need is higher than your spending target.
• Health insurance before Medicare eligibility at 65 is the largest missing line for most early retirees, and marketplace premiums for a family can run well into five figures a year.
• It does not model early-access mechanics. Most retirement money carries age restrictions, so an early retiree needs a taxable bridge, a Roth conversion ladder, or a section 72(t) arrangement.
• Returns are modeled as a smooth average. Sequence-of-returns risk — a bad market arriving early in retirement — is the main way a plan with adequate average returns still fails.

Common questions

What withdrawal rate should I use?

Four percent is the common starting point, drawn from research on 30-year retirements using US historical returns. For a retirement expected to last 40 or 50 years, many planners use 3% to 3.5% instead, because longer horizons give a bad return sequence more chances to do damage.

Where does the 25x number come from?

It is the 4% rule inverted. Withdrawing 4% a year means the portfolio must be 25 times annual spending, since 1 divided by 0.04 is 25. At a 3.5% rate the multiple becomes roughly 28.6x, and at 3% about 33x.

Does this account for Social Security?

No. Benefits are calculated from your highest 35 years of indexed earnings, so retiring very early leaves zero years in that average and permanently reduces the eventual benefit. It does not disappear, but it will be smaller than a full-career projection implies.

What is sequence-of-returns risk?

The risk that poor returns arrive early in retirement rather than late. Withdrawing from a portfolio while it is down permanently removes shares that would have participated in the recovery, so two retirees with identical average returns can end up in very different places.

Net Worth Calculator

Not modeled

• Asset values are your estimates. Property, private business interests, and collectibles are worth what someone pays, not what a spreadsheet says.
• Retirement account balances are pre-tax for traditional accounts, so a dollar there is worth less than a dollar in a Roth or taxable account.
• Percentile comparisons use survey data collected in a prior year and describe the population, not people in your situation.
• Net worth is a snapshot, not a plan. Two households with identical net worth and different savings rates end up in very different places.

Retirement Savings Calculator

Not modeled

• Returns are a smooth constant rate; real sequences vary and the order matters once you begin withdrawing.
• It does not apply taxes on withdrawal. A traditional 401(k) balance and a Roth balance of the same size fund very different amounts of spending.
• Required minimum distributions are not modeled. Traditional accounts force taxable withdrawals on the IRS schedule in your seventies whether or not you need the money.
• Employer match rules, vesting schedules, and plan-specific limits are not modeled — check your plan documents for those.
• Contribution limits are indexed annually. A multi-decade projection at today's limit understates what you will be permitted to contribute in later years.

Common questions

What return should I assume?

There is no correct answer, only more and less honest ones. Long-run US stock returns are often cited near 10% nominal, roughly 7% after inflation. Using 7% real is a common convention; using 10% and ignoring inflation quietly assumes purchasing power that will not exist.

How much do I need to retire?

A common framing is 25 to 33 times annual spending, corresponding to a 3% to 4% withdrawal rate. The number depends far more on your spending than on your income, which is why two people with the same salary can need very different amounts.

Should I count on Social Security?

Benefits are a real part of most retirement plans, based on your highest 35 years of indexed earnings. The Social Security Administration publishes a personalized estimate in your online account, which is more reliable than any general assumption.

Does the employer match count toward the contribution limit?

No. Employer matching and profit-sharing contributions sit outside the employee deferral limit and count instead against a separate, much higher combined annual additions limit that very few employees approach.

Roth vs. Traditional Calculator

Not modeled

• The comparison turns on your tax rate now versus in retirement, which nobody knows. Treat the result as a sensitivity test rather than an answer.
• It does not model required minimum distributions, which apply to traditional balances and not to Roth IRAs during the owner's lifetime.
• Income phase-outs for Roth IRA eligibility and traditional IRA deductibility are not modeled.
• State tax now versus state tax in retirement can flip the answer, particularly if you expect to move between a high-tax and a no-income-tax state.

Social Security Calculator

Not modeled

• It estimates from the benefit formula using the earnings you enter. Your actual benefit uses your full indexed earnings record, which the SSA holds and publishes in your online account.
• Future cost-of-living adjustments are unknown. The 2026 COLA is confirmed at 2.8%; later years are not.
• The earnings test, which temporarily reduces benefits for people claiming before full retirement age while still working, is not modeled.
• Spousal, survivor, and divorced-spouse benefits follow separate rules not covered here.
• Taxation of benefits is not modeled — up to 85% of benefits can be taxable depending on combined income.

RMD Calculator

Not modeled

• It uses the Uniform Lifetime Table, which applies to most account owners. A different table applies when the sole beneficiary is a spouse more than ten years younger, and inherited accounts follow separate rules entirely.
• The calculation uses the prior December 31 balance. Market movement since then does not change this year's required amount.
• Multiple accounts have different aggregation rules: IRA distributions may be taken from any IRA, while each 401(k) generally requires its own distribution.
• It does not model the tax consequence of the distribution, which is ordinary income and can affect Medicare premiums and the taxable portion of Social Security.

Trump Account Calculator

Not modeled

• Program rules are still being implemented and some details may change. Confirm current terms before relying on a projection.
• Growth is modeled at a constant rate. Actual returns vary, and a long horizon amplifies the difference between the assumed rate and the real one.
• Tax treatment at withdrawal depends on the use of the funds and on rules that differ from 529 plans and custodial accounts.
• It does not compare against the alternatives on an after-tax basis, which is the comparison that usually decides between account types.

HSA Calculator

Not modeled

• Eligibility requires enrollment in a qualifying high-deductible health plan and no other disqualifying coverage — the calculator assumes you have confirmed that.
• Growth projections assume the balance is invested. Many HSAs hold cash by default and require a minimum balance before investing is permitted.
• Withdrawals for non-qualified expenses before 65 are taxable and carry a 20% penalty; after 65 they are taxable but not penalized.
• Contributions made through payroll also avoid FICA; contributions made directly to the account afterward do not. The calculator does not distinguish them.

Federal Income Tax & Refund Estimator

Not modeled

• It estimates federal income tax only. State and local income taxes, and payroll taxes, are separate.
• It models the standard deduction and common credits. Itemized deductions, business income, capital gains, and the alternative minimum tax are not part of the calculation.
• Phase-outs for credits and deductions are modeled where included, but the interaction between several phase-outs at once is where real returns get complicated.
• A refund estimate depends on withholding you enter. If that figure is wrong, the estimate is wrong by the same amount.

Self-Employment Tax Calculator

Not modeled

• It calculates self-employment tax only. Federal income tax on the same earnings is separate and additional, as is state income tax.
• Business deductions must be applied before you enter net earnings. The tax is computed on profit after deductible expenses, not on gross revenue.
• It does not model an S corporation election, which changes the calculation substantially for some businesses and is worth a conversation with a CPA rather than a rule of thumb.
• Quarterly estimated payments are not scheduled here. Owing $1,000 or more generally triggers the requirement, and skipping them adds an underpayment penalty computed like interest.

Common questions

Why is the tax 15.3%?

It is both halves of FICA. A W-2 employee pays 7.65% and their employer pays a matching 7.65%. Self-employed people are both parties, so they pay 12.4% for Social Security plus 2.9% for Medicare. It is not an extra tax on freelancers — it is the employer half becoming visible.

Why does it apply to only 92.35% of my earnings?

Because a W-2 employee never pays income tax on the employer half of FICA, since it never enters their wages. The 92.35% factor excludes an equivalent slice so the treatment is comparable.

Is any of it deductible?

Yes. One-half of your self-employment tax is deducted as an adjustment to income on Form 1040, available whether or not you itemize. It reduces income tax, not the self-employment tax itself.

Does the tax stop at a certain income?

The Social Security portion does, at $184,500 of combined wages and net self-employment earnings for 2026. The Medicare portion has no cap, and an Additional Medicare Tax of 0.9% applies above $200,000 single or $250,000 married filing jointly.

Sales Tax Calculator

Not modeled

• It uses each state's population-weighted average combined rate. Actual rates are set by county, city, and special districts, and within a single state can span more than two percentage points.
• Exemptions are not modeled. Most states exempt or reduce the rate on unprepared groceries and prescription drugs, and a few exempt clothing — with statutory boundaries that are genuinely peculiar.
• Sales tax holidays are not modeled. Many states exempt qualifying purchases below a price cap for a weekend each year.
• For an exact amount, use the combined rate at the delivery address, which your state or county revenue department publishes.

Common questions

Why does sales tax differ between two stores in the same state?

Because states authorize counties, cities, and special districts to add their own rate on top of the state rate. Two stores a mile apart can sit in different jurisdictions and charge different amounts on the same item.

Which states have no sales tax?

Alaska, Delaware, Montana, New Hampshire, and Oregon have no statewide sales tax. Alaska is the exception among them: it permits local sales taxes, so the average combined rate paid there is about 1.82% rather than zero.

Do I owe sales tax on online purchases?

Generally yes. After the Supreme Court's 2018 decision in South Dakota v. Wayfair, states may require out-of-state sellers to collect once they exceed a threshold of sales in that state. Where a seller does not collect, most states impose a corresponding use tax the buyer owes directly.

Why was I charged tax on some items and not others?

States decide independently what is taxable. Most exempt unprepared food, nearly all exempt prescription drugs, and the line between exempt groceries and taxable prepared food, candy, or soft drinks is drawn differently in every state.

Car Loan Interest Deduction Calculator

Not modeled

• Eligibility depends on vehicle assembly location, loan origination date, and income thresholds — conditions that exclude many buyers who assume they qualify.
• It is a deduction, not a credit. It reduces taxable income rather than reducing your tax bill dollar for dollar.
• Only interest on a qualifying new vehicle loan counts. Refinanced loans, leases, and used vehicles are treated differently.
• The provision has a scheduled expiry, so it is not a permanent feature of the tax code.

Tips & Overtime Deduction Calculator

Not modeled

• These are deductions on your federal return, not exemptions from withholding. Your paycheck does not change; the benefit arrives at filing.
• Eligibility depends on occupation, income thresholds, and the definitions in the statute, which are narrower than the headlines suggest.
• State treatment is separate. A federal deduction does not automatically reduce state taxable income.
• The provisions have scheduled expiry dates, so a benefit available this year may not be available in a later one.

Child Tax Credit Calculator

Not modeled

• It models the Child Tax Credit and its refundable portion. Other dependent-related credits and the Earned Income Tax Credit are separate.
• Qualifying-child rules — age, relationship, residency, support, and a valid Social Security number — must be met, and are not tested here.
• The phase-out thresholds are fixed in statute rather than inflation-indexed, so they do not move year to year even as the credit amount does.
• The refundable portion depends on earned income, so a household with little earned income may not receive the full amount.

Paycheck Calculator

Not modeled

• State income tax is exact only for states with no wage income tax or a single flat rate. Everywhere else the estimate applies the top marginal rate rather than the real progressive brackets, which overstates the tax for most earners — the result is labeled accordingly.
• Local and city income taxes are not modeled at all. Where they apply, your actual withholding is higher than the estimate.
• Withholding is not your tax. It is your employer's estimate based on your Form W-4, and the difference is settled on your return as a refund or a balance due.
• It assumes one job and one employer. A second job, a working spouse, or income without withholding all cause under-withholding that this calculator cannot see.
• Benefit deductions must be entered manually. Pre-tax health premiums, HSA and FSA contributions, and retirement deferrals each interact with income tax and FICA differently.

Salary to Hourly Calculator

Not modeled

• It converts gross pay. Take-home is lower by taxes, FICA, and benefit deductions, and the gap varies with your state and elections.
• Salaried and hourly work are not equivalent even at the same effective rate: overtime eligibility, benefits, and paid time off differ substantially.
• A standard 2,080-hour year assumes 40 hours a week with no unpaid time off. Actual hours worked change the real hourly figure considerably.
• Contractor rates need to cover self-employment tax, health insurance, unpaid time off, and equipment — a straight salary-to-hourly conversion understates what a contractor needs to charge.

Bonus Tax Calculator

Not modeled

• The 22% flat rate is a withholding convention, not your tax rate. What you actually owe is settled on your return against your marginal bracket, and the difference can be substantial in either direction.
• Employers may instead use the aggregate method, which combines the bonus with regular wages and withholds at the resulting rate. Your employer chooses; you do not.
• State supplemental withholding rules vary and are not modeled.
• FICA applies to bonuses in the normal way, on top of income tax withholding.

How Much House Can I Afford?

Not modeled

• It applies the conventional 28/36 debt-to-income guideline. Automated underwriting frequently approves higher ratios with compensating factors, and being approved for more is not the same as it being affordable.
• The ratios use gross income, before tax. A household at the 36% limit on gross income may be committing well over 45% of take-home pay to debt.
• It does not count the expenses a lender ignores but a homeowner pays: maintenance at roughly 1% of home value a year, higher utilities than a rental, and the repair the inspection did not catch.
• Down payment and closing costs are separate piles of cash. Reaching the down payment target without reserves left over is the most common way a purchase goes wrong in the first year.

Common questions

What is the 28/36 rule?

A conventional underwriting guideline: total housing costs at or under 28% of gross monthly income, and all debt payments together at or under 36%. It is a convention used throughout mortgage underwriting and CFPB consumer guidance, not a legal limit — lenders approve above it regularly.

Do I need 20% down?

No. Twenty percent is the threshold that avoids private mortgage insurance on a conventional loan, not a minimum to qualify. Conventional loans go as low as 3% down for eligible buyers, FHA to 3.5%, and VA and USDA can require nothing down for those who qualify.

How much cash do I need beyond the down payment?

Closing costs of roughly 2% to 5% of the purchase price, plus reserves after closing, plus moving and immediate repair costs. On a $400,000 home with 10% down, the realistic total is closer to $64,000 than to the $40,000 down payment alone.

Does paying off a car loan help me qualify for more?

Substantially. A monthly debt payment directly displaces borrowing capacity inside the back-end ratio. At a 6.58% rate over thirty years, removing a $450 car payment frees roughly $70,000 of additional mortgage.

Mortgage Calculator (PITI + PMI)

Not modeled

• Property tax uses a state average. Rates are set by county, city, and school district, and can vary by more than a full percentage point between neighboring jurisdictions within one state.
• Homeowners insurance is an estimate, not a quote. Premiums vary sharply by region, construction, claims history, and have risen steeply in some markets.
• It models principal, interest, taxes, and insurance. It does not include HOA dues, maintenance, or utilities, which together often add several hundred dollars a month to the real cost of owning.
• Closing costs are not part of the monthly payment and are not included here — budget 2% to 5% of the purchase price separately.
• The default interest rate is a survey average from a specific week, not a quote for you. Your actual rate depends on credit score, loan-to-value, property type, and occupancy.

Rent vs. Buy Calculator

Not modeled

• The break-even depends heavily on how long you stay, and that is the input people are least honest with themselves about. A buy-and-sell round trip commonly costs 8% to 10% of the price, which appreciation has to cover before ownership gets ahead.
• It cannot know your local price-to-rent ratio, which is the single biggest determinant of the answer and varies enormously between metros and even neighborhoods.
• Home price appreciation is an assumption, not a forecast. Small changes to it move the result a great deal, which is a reason to test a pessimistic case rather than trust a single run.
• The mortgage interest deduction is worth nothing to filers who take the standard deduction, which is now most of them. Do not count it unless your itemized deductions genuinely exceed the standard amount.

Common questions

How long do I need to stay for buying to beat renting?

Commonly five to seven years, though it depends on your local price-to-rent ratio, your interest rate, and what prices do. The threshold exists because the round-trip transaction cost of buying and selling — often 8% to 10% of the price — must be recovered first.

Is renting throwing money away?

Rent buys a month of shelter, and so does the interest portion of a mortgage payment. Early in a 30-year loan, most of the payment is interest, taxes, and insurance — none of which builds equity. The honest comparison is unrecoverable cost against unrecoverable cost.

What is the price-to-rent ratio?

Home price divided by annual rent for a comparable property. Lower ratios favor buying, higher ratios favor renting. A $400,000 home versus $2,000 monthly rent gives about 16.7; the same home where the equivalent rents for $3,300 gives about 10.1.

Should I count the down payment as a cost?

You should count its opportunity cost. Money used as a down payment is not invested and not available, and a fair comparison assumes the renter invests both that sum and any monthly difference — which most renters do not actually do, and which is a genuine behavioral argument for buying.

Rental Property ROI Calculator

Not modeled

• Vacancy, maintenance, and capital reserves are estimates you supply, and they are the lines first-time landlords most often understate. A roof does not fail every year, which is exactly why it gets left out.
• Property tax and insurance vary by parcel. Use the actual bill and a real quote rather than a state average for any property you are serious about.
• Net yield deliberately excludes the mortgage, because it measures the asset rather than your financing. Cash-on-cash return is the metric that includes debt service.
• Depreciation and its recapture at sale are not modeled. Residential rental property is depreciated over 27.5 years, and the IRS taxes the accumulated depreciation when you sell.
• Self-managing is not free. If you do not price your own time, you are comparing a job against a passive investment.

Common questions

What is the difference between gross and net yield?

Gross yield is annual rent divided by purchase price and ignores every cost of ownership. Net yield subtracts operating expenses and uses total acquisition cost as the denominator. For a typical US single-family rental, net commonly lands near half the gross figure.

What is the 50% rule?

A screening heuristic: operating expenses excluding the mortgage tend to run about half of gross rent over the long run, once vacancy, maintenance, reserves, taxes, insurance, and management are counted. If your projected expenses come to 25% of rent, something is missing.

Does leverage always improve returns?

No. Positive leverage requires the net yield to exceed your borrowing rate. If a property nets 3.7% and the mortgage costs 6.5%, borrowing reduces your return rather than amplifying it.

What expense do new landlords forget most often?

Capital expenditure reserves. Spreading the expected replacement cost of a roof, furnace, or water heater across its useful life is what turns a lucky quiet year into an honest number.

Capital Gains Tax on Home Sale

Not modeled

• The gain is measured against your adjusted basis, not your mortgage balance. The loan is irrelevant to the calculation, and treating it as the cost is the most common error.
• Capital improvements raise your basis and reduce the gain — but only the ones you can document. Repairs and maintenance do not qualify.
• It does not model depreciation recapture. If the home was ever a rental, depreciation you claimed or could have claimed is taxed separately and is not covered by the exclusion.
• State tax is not included. Some states tax capital gains as ordinary income, several have no income tax, and the difference can be substantial on a large gain.
• Partial exclusions for a qualifying early sale — a job move, a health reason, certain unforeseen circumstances — are not modeled here.

Common questions

How much gain is excluded?

Up to $250,000 for a single filer and $500,000 for married filing jointly, under Internal Revenue Code section 121. These amounts are fixed in statute and not adjusted for inflation, so they cover a shrinking share of a typical long-tenured gain.

What are the ownership and use tests?

You must have owned the home at least two of the five years before the sale, and lived in it as your main home at least two of those same five years. The periods need not be continuous or simultaneous. You generally cannot have used the exclusion on another sale in the prior two years.

What counts as a capital improvement?

Work that adds value, prolongs the home's life, or adapts it to new uses: an addition, a new roof, a kitchen remodel, central air, a finished basement. Repainting and fixing a leak do not count. Keeping receipts matters — improvements reduce a taxable gain dollar for dollar decades later.

What do I owe on gain above the exclusion?

Long-term capital gains tax, at 0%, 15%, or 20% depending on total taxable income including the gain. A 3.8% net investment income tax may also apply above $200,000 of modified adjusted gross income single, or $250,000 married filing jointly.

HELOC Calculator

Not modeled

• HELOC rates are variable and typically tied to the prime rate. A payment that is comfortable today can change materially over a ten-year draw period.
• The transition from the interest-only draw period to the repayment period is where payments jump sharply — often by a factor of two or more.
• Your home is the collateral. Unlike credit card debt, failing to repay a HELOC puts the house at risk.
• Deductibility of the interest depends on whether the proceeds were used to buy, build, or substantially improve the home securing the loan, and only if you itemize.

Refinance Break-Even Calculator

Not modeled

• The break-even assumes you keep the new loan long enough to recover the closing costs. Selling or refinancing again before that point makes the refinance a loss.
• Resetting to a new 30-year term lowers the payment while extending the debt, which can raise total interest even at a lower rate.
• Cash-out refinances price above rate-and-term refinances, and the difference is not modeled unless you enter it.
• It cannot tell you what rates will do. A break-even is arithmetic on today's offer, not a forecast.

Property Tax Calculator

Not modeled

• The state rate is an average. Property tax is set by county, city, and school district, and rates within a single state can differ by more than a full percentage point.
• Assessed value is not market value in most jurisdictions, and several states cap how fast an assessment can rise for existing owners.
• Exemptions are not modeled. Most states offer a homestead exemption, and many offer additional reductions for people over 65, veterans, or those with disabilities.
• Deducting property tax federally is limited by the SALT cap and only available if you itemize, which most filers no longer do.

Extra Payment Calculator

Not modeled

• It assumes the extra payment is applied to principal. Servicers do not always do that by default — some hold it as a prepaid future payment — so the instruction must be given in writing and verified on the next statement.
• It does not check your note for a prepayment penalty. These are restricted on most qualified mortgages and prohibited on FHA, VA, and USDA loans, but auto and personal loans vary by contract and state.
• Precomputed-interest loans do not behave this way. Where interest is calculated up front for the full term, paying early saves considerably less than a simple-interest schedule implies.
• It does not compare the extra payment against other uses of the money — an employer retirement match, high-rate debt, or an unfunded emergency fund all usually outrank it.

Common questions

Should I shorten the term or lower the payment?

Shortening the term saves far more interest, because it removes payments from the end of the schedule where the balance was outstanding longest. Lowering the payment through a recast frees monthly cash flow instead. Most servicers keep the term unless you specifically request a recast.

Why do early extra payments matter so much more?

Amortized loans front-load interest, so a dollar of principal removed in year one avoids interest for the entire remaining term. The same dollar sent in year twenty avoids only a few years of it.

Will an extra payment lower my next monthly payment?

No, unless you request a recast. A normal extra payment shortens the schedule but leaves the required monthly amount unchanged. Recasting reamortizes the reduced balance over the remaining term and does lower the payment, usually for a modest fee.

Is paying off a mortgage early always worth it?

It produces a certain return equal to your loan rate, which is genuinely valuable. Whether it beats the alternative depends on the rate: below roughly 4%, investing the difference often wins on expected value; in double digits, paying down almost always wins on certainty.

True Cost of Car Ownership

Not modeled

• Depreciation rates vary enormously by make, model, and market conditions. The shape of the curve is consistent; the specific numbers for your vehicle are not knowable in advance.
• Insurance differs by vehicle far more than most buyers expect, and by driver, location, and coverage level on top of that. Get a real quote for the specific model.
• Maintenance and repair costs rise with age in a way a flat annual figure does not capture.
• Sales tax and registration vary by state, and several states treat leases differently from purchases.
• It does not model gap insurance or the negative equity that long loan terms produce in the early years.

Common questions

What actually determines a lease payment?

The negotiated price, the residual value the lender assigns at lease end, and the money factor. The payment covers the depreciation between those two values plus a finance charge, which is why a car with a high residual leases cheaply even at a high sticker price.

How do I convert a money factor to an interest rate?

Multiply it by 2,400. A money factor of 0.00250 is roughly a 6% APR. Dealers are not required to present it as a rate, which is why converting it yourself is worth the ten seconds.

Is paying cash always cheapest?

On total dollars paid, usually — you avoid finance charges entirely. But the money is then unavailable for anything else. With a promotional 0% or 1.9% manufacturer rate, financing and keeping the cash is frequently the better use of it.

What is negative equity and how does it happen?

Owing more than the vehicle is worth. It is common with long terms and small down payments, because depreciation outpaces principal reduction early on. Rolling the shortfall into the next car loan carries the problem into the following vehicle.

Personal Loan Calculator

Not modeled

• It calculates from the interest rate, not the APR. If the loan carries an origination fee, your true cost is higher than the payment schedule shows — compare offers by APR.
• Origination fees are commonly deducted from the disbursement, so a $10,000 loan with a 5% fee puts $9,500 in your account while you owe and pay interest on $10,000.
• It does not model optional add-ons sold at signing. Credit life and disability products are frequently financed into the loan, so you pay interest on the premium as well.
• It assumes every payment is made on time. Late fees and any penalty rate in the contract are outside the schedule.

Common questions

Should I compare loans by rate or APR?

APR, when the loans are the same type and term. APR folds in origination fees and other finance charges, which is exactly why the Truth in Lending Act requires it to be disclosed. A low rate with a large fee frequently costs more than a higher rate with none.

Does applying to several lenders hurt my credit score?

Much less than people assume. Scoring models treat multiple hard inquiries for the same loan type within a short window — commonly 14 to 45 days — as a single inquiry, specifically so comparison shopping is not penalized. Many lenders also prequalify with a soft pull.

What term should I choose?

The shortest whose payment you can comfortably make. On $15,000 at 11%, a 36-month term costs about $2,676 in interest and a 72-month term about $5,592 — the same money, $2,916 more expensive.

Is a personal loan a good way to consolidate credit card debt?

The arithmetic usually works, since personal loan rates sit below card rates and a fixed term forces a payoff date. It fails when the cards get used again, leaving you with the loan and new balances. Decide what happens to the cards before the money arrives.

Debt Payoff Calculator

Not modeled

• It assumes rates and minimum payments stay fixed. Variable card rates move with the prime rate, and minimums are typically a percentage of the balance, so both change as you pay down.
• It does not model a promotional 0% period expiring, which is the single most common reason a real payoff plan goes off track.
• New spending on the accounts is not modeled. A payoff plan and continued card use cancel each other out.
• It compares strategies on arithmetic only. Avalanche minimizes interest; snowball clears small balances first and finishes more plans in practice. The cheaper method is not the better one if you abandon it.

Credit Card Payoff Calculator

Not modeled

• Minimum payments are modeled from a typical formula. Your issuer sets its own, and the exact minimum affects the payoff timeline considerably.
• It assumes no new purchases on the card. Adding spending while paying down is the main reason projected payoff dates are missed.
• Promotional and penalty rates are not modeled. A 0% period ending, or a penalty rate triggered by a late payment, changes the schedule sharply.
• Card interest usually compounds daily on the average daily balance, so real interest can differ slightly from a monthly-compounding estimate.

Student Loan RAP Calculator

Not modeled

• RAP took effect July 1, 2026 and parts of its administration are still being implemented. Confirm details with your servicer before acting on an estimate.
• Payments are computed from adjusted gross income, so a change in income changes the payment at your next recertification, not immediately.
• Parent PLUS loans and consolidation loans containing them are not eligible for RAP and are not modeled.
• The forgiveness timeline and the treatment of qualifying payments for Public Service Loan Forgiveness are the details most worth confirming directly with Federal Student Aid.

50/30/20 Budget Calculator

Not modeled

• The 50/30/20 split is a starting framework, not a rule. It fails immediately in very high cost-of-living areas where housing alone exceeds half of take-home pay.
• It works from take-home pay, so pre-tax retirement contributions and benefit deductions are already excluded and should not be double-counted.
• Irregular expenses — annual insurance, car registration, holidays — need a sinking fund rather than a monthly category, or they will keep breaking the budget.
• The categories are a guide. What matters is that the three add to your income, not that they hit those exact percentages.

Emergency Fund Calculator

Not modeled

• The months-of-expenses benchmark should be built from essential expenses, not total spending. Discretionary spending is what you cut in an emergency.
• The right number depends on how replaceable your income is. A dual-income salaried household and a single-income freelancer with the same expenses need very different funds.
• It does not account for the specific risks in your situation — a specialized role in a narrow job market may need a fund sized to replacement time rather than to a round number of months.
• Where you keep the money matters as much as how much. A balance that can fall 30% is not an emergency fund.

Cost of Living Calculator

Not modeled

• It uses regional price parity, a broad index of overall price levels. Your personal difference depends on your specific spending, and housing dominates the variation.
• State and local income tax differences are a large part of a real relocation comparison and are only approximated here.
• Salaries do not scale with cost of living automatically. A move to a cheaper area often comes with lower pay, sometimes disproportionately.
• It cannot price the things that actually decide a move: commute, schools, family, climate, and career opportunity.

Inflation Calculator

Not modeled

• The CPI measures an average basket, and nobody buys the average basket. A homeowner with a fixed mortgage and a renter in a tight market experience very different real inflation in the same year.
• Housing enters the index through owners' equivalent rent, a survey-based estimate that moves slowly and lags actual market rents.
• Historical figures describe the past. They are the right tool for converting amounts across time and the wrong tool for forecasting the next decade.
• Regional variation is not modeled. Inflation in a high-cost metro and a low-cost rural area can differ meaningfully within the same year.

Common questions

Which inflation measure does this use?

The Consumer Price Index published monthly by the Bureau of Labor Statistics. Note that several versions exist: CPI-U is the headline figure, CPI-W drives the Social Security cost-of-living adjustment, and chained CPI indexes federal tax brackets.

Why does the official rate not match my experience?

Because your basket is not the average basket. Your personal rate depends on whether you rent or own, how far you drive, whether you pay for childcare, and what your medical costs are — any of which can put you several points above or below the national figure.

What inflation rate should I assume for planning?

The Federal Reserve targets 2% annual inflation on a related index and has publicly committed to steering toward it; long-run US history has generally run somewhat above that. The more useful exercise is checking whether your plan still works at a rate one or two points higher.

What is core inflation?

The index excluding food and energy, which swing for reasons unrelated to broad monetary conditions. It is watched as a cleaner signal of the persistent trend, not because food and energy do not matter — headline CPI is what actually drives indexing decisions.

Currency Converter

Not modeled

• Rates shown are reference rates, not the rate any consumer service will give you. The gap between the reference rate and your actual rate is the spread, and it is where most of the cost hides.
• It does not include your card issuer's foreign transaction fee, commonly around 3%, or an ATM operator's charge.
• It cannot account for dynamic currency conversion — the offer to be charged in dollars at a foreign terminal — which typically adds a 3% to 7% markup chosen by the merchant's processor.
• Rates move continuously. A figure from earlier today is a reference point, not a quote you can transact at.

Common questions

What is the mid-market rate?

The midpoint between buy and sell prices for a currency pair in the wholesale market — the rate shown on financial sites. No consumer service gives you exactly this rate, and the difference between it and what you are offered is often the largest fee you pay even when nothing is labeled a fee.

Should I accept when a foreign terminal offers to charge me in dollars?

No. That is dynamic currency conversion, and the merchant's processor picks the rate and adds a markup commonly running 3% to 7%. Always choose the local currency and let your card network do the conversion.

Is it worth exchanging cash at the airport?

Only for a small amount you need on arrival. Airport counters have captive customers and price accordingly, frequently with spreads far above what a bank ATM in the destination country charges. "No commission" usually means the fee is in the rate instead.

Debit or credit card abroad?

A credit card with no foreign transaction fee for purchases, because the network rate is close to mid-market and fraud protection is stronger. A debit card for ATM withdrawals. Never a credit card cash advance abroad — it typically carries a fee plus interest accruing immediately with no grace period.

Tip Calculator

Not modeled

• Tipping norms vary by service, region, and situation, and they are conventions rather than rules. The percentages offered here are common US practice, not an obligation.
• It does not know whether a service charge or automatic gratuity is already on your bill, which is standard for large parties and increasingly common elsewhere.
• Whether to tip on the pre-tax or post-tax total is a matter of preference; the calculator lets you choose, and the difference is small.
• It does not model tip pooling or how a tip is distributed among staff, which varies by establishment.

Common questions

What is a standard tip in the United States?

For sit-down restaurant service, 15% to 20% of the bill is the common range, with 18% to 20% typical for good service in most metros. Counter service, delivery, and personal services follow different conventions.

Should I tip on the pre-tax or post-tax amount?

Either is accepted. Tipping on the pre-tax subtotal is the more common convention and slightly cheaper; tipping on the total is simpler arithmetic. On a $100 meal the difference is usually a dollar or two.

Do I still tip when there is a service charge?

Generally the service charge replaces the tip, but it is worth checking whether it goes to the staff. Automatic gratuity for large parties is a tip by another name; a "service fee" may not reach servers at all, in which case an additional tip is reasonable.

Are tips taxable income for the server?

Yes. Tips are taxable wages and must be reported, though recent federal law created a deduction for a portion of qualified tip income for eligible workers — a deduction on the return, not an exemption from reporting.