A down payment has a job and a deadline. On closing day the money has to be there, in full, in cash. That single constraint eliminates most of the investment universe before any discussion of returns begins.
The useful question is not how to maximize the return on this money. It is how to earn something without ever risking the deadline.
Why the stock market is the wrong tool here
Over long horizons, equities have delivered the best returns available to ordinary investors. Over two- and three-year windows they have delivered anything at all, including deeply negative outcomes.
Look at the asymmetry honestly. Invest $60,000 for three years and a good outcome is perhaps $72,000 — an extra $7,000 or so over what a savings account would have produced. A bad outcome is $45,000, which does not merely reduce your house; it may end the purchase and reset your timeline by years.
Downturns also correlate with the things that delay home purchases. A recession that cuts the market is the same recession that puts jobs at risk, so the loss and the income disruption tend to arrive together.
The extra few thousand dollars is not worth that. This is the clearest case in personal finance where the right answer is a boring one.
High-yield savings accounts
The default, and for most people the right answer. Rates on online high-yield savings accounts track short-term interest rates, so they rise when the Federal Reserve raises rates and fall when it cuts.
The properties that matter here are all satisfied: the balance cannot fall, funds are available within a day or two, FDIC insurance covers up to $250,000 per depositor per institution per ownership category, and the rate is respectable.
The trade-off is that the rate is variable. If short-term rates fall while you save, so does your yield. For a purchase within a year or two, that is a minor cost.
Treasury bills
Short-term US government debt, issued in maturities from four weeks to one year. You buy at a discount to face value and receive face value at maturity; the difference is your return.
Two features make them attractive for this purpose. First, credit risk is as low as it gets. Second, and often overlooked, interest on Treasury securities is exempt from state and local income tax. For someone in a state with a high income tax, that exemption can raise the effective after-tax yield by a meaningful margin relative to a savings account paying the same nominal rate.
They can be bought directly through TreasuryDirect or through a brokerage. If you need the money before maturity you can sell in the secondary market, where the price may be slightly above or below what you paid depending on rate movements — a small consideration on a four-week or eight-week bill.
There is also no insurance cap to worry about, since these are direct obligations of the government rather than bank deposits.
CDs and CD ladders
A certificate of deposit locks a rate for a fixed term. That is an advantage if rates are falling and a disadvantage if they are rising, and it comes with an early withdrawal penalty that typically forfeits some months of interest.
The specific risk for a home purchase is timing. Closings move. A seller who wants to close six weeks early turns a locked CD into a penalty.
A ladder addresses this: split the money across several maturities — three, six, nine, and twelve months — so a portion becomes available regularly. It preserves most of the rate advantage while keeping something liquid at all times.
For a purchase with a genuinely firm date well in the future, a single CD maturing before it is clean and simple.
Money market funds, and a naming trap
Two different products share nearly the same name, and the difference matters.
A money market deposit account is a bank product and is FDIC insured like a savings account.
A money market mutual fund is a security. It is not FDIC insured. Government money market funds hold short-term Treasuries and repurchase agreements and are extremely conservative, and they are widely used as cash holdings inside brokerage accounts, but the legal structure is different from a deposit.
For most people saving a down payment, this distinction is more of a footnote than a decision — but knowing which one you hold is worth thirty seconds.
What not to use
Series I savings bonds have a twelve-month lockup and a three-month interest penalty if redeemed within five years, which makes them awkward for a purchase on an uncertain date.
Bond funds, including short-term ones, can and do lose value when rates rise, which is exactly the environment where you might be waiting.
Crypto and individual stocks are volatile enough that the deadline and the asset are simply incompatible.
And a 401(k) loan, occasionally suggested for a down payment, converts a savings problem into an employment risk: leaving the job typically accelerates repayment, and failure to repay is treated as a distribution with tax and potentially a penalty.
A reasonable split
Buying within a year: high-yield savings, possibly with a portion in short Treasury bills. Full liquidity is worth more than a few basis points.
Buying in one to three years: a mix of high-yield savings and a Treasury bill or CD ladder, keeping several months of the total immediately accessible.
Buying in more than five years: this is a different question, and some equity exposure becomes defensible — but only if you are genuinely willing to delay the purchase rather than sell into a decline.
And keep the down payment separate from the emergency fund, in a different account. Money with two jobs eventually fails at one of them.