Private mortgage insurance (PMI) is a monthly cost that comes with putting down less than 20% on a conventional mortgage — and a lot of homeowners let it run longer than it needs to simply because they're waiting for their lender to cancel it automatically, without realizing they can request removal sooner.
The two thresholds: 80% (you request) vs. 78% (automatic)
The federal Homeowners Protection Act sets up two distinct points. At 80% loan-to-value (LTV) — meaning your loan balance has dropped to 80% of the home's ORIGINAL value — you can formally REQUEST that your lender cancel PMI. This isn't automatic; you have to initiate it, typically in writing, and you may need to meet requirements like a good payment history and no other liens on the property. If you never request it, your lender is still legally required to cancel PMI automatically once your balance reaches 78% of the original value, on the loan's original amortization schedule — but that's a full 2 percentage points of equity later than the earliest point you could have requested it yourself.
How extra payments and rising home values both help
Two separate levers get you to 80% LTV sooner. First, extra principal payments accelerate how fast your actual loan balance shrinks relative to the home's original value — every extra dollar toward principal is a dollar closer to being able to request cancellation. Second, and often overlooked, if your home's market value has risen since you bought it, your loan-to-value ratio may already be below 80% even without a single extra payment, purely because the home is worth more relative to the same loan balance. Documenting that typically requires ordering a new appraisal, at your own cost, to present updated value evidence to your lender.
A worked example
A borrower bought a $400,000 home with 10% down, taking out a $360,000 loan (90% LTV) and PMI. Automatic cancellation at 78% of the ORIGINAL $400,000 value happens once the balance reaches $312,000 — on schedule, that might take several years of normal amortization. But if the borrower makes consistent extra principal payments, or if the home's value has appreciated to $440,000 (making even the un-paid-down $360,000 balance equal to just under 82% of the new value — close to, though not yet at, the 80% threshold), they could request cancellation notably earlier than the automatic 78% date, saving potentially years of unnecessary PMI payments.
Common mistakes
Waiting passively for automatic cancellation at 78% is the single biggest mistake — the 80% request option is available two percentage points of equity earlier, and nobody but you is going to initiate that request. The second is forgetting that home value appreciation is a legitimate, often faster path to 80% LTV than extra payments alone, especially in a rising local market. The third is not confirming your specific loan servicer's exact process and paperwork requirements in advance, since procedures for a borrower-requested cancellation vary somewhat by servicer.