"You need 20% down" is one of the most repeated pieces of homebuying advice — and one of the most misunderstood. Twenty percent isn't a requirement to get a mortgage. It's the threshold for one specific cost: private mortgage insurance. Below that line, the math changes a bit. Above it, the benefits get smaller the higher you go. Here's how to think about where you actually fall.
Where the 20% figure comes from
On most conventional loans, if your down payment is less than 20% of the home's price, the lender will require private mortgage insurance, or PMI. PMI doesn't protect you — it protects the lender if you default. It's an added monthly cost on top of your principal, interest, taxes, and insurance, and it typically stays in place until your equity (the portion of the home you actually own) crosses that 20% line, at which point it can usually be removed.
That's the entire origin of the "20% rule." It's not about what you can afford or what's financially optimal — it's the point at which one specific monthly cost disappears.
The case for a bigger down payment
Lower monthly payment. A smaller loan amount means a smaller principal and interest payment, every month, for the life of the loan.
Less interest over time. Borrowing less means paying less interest in total — sometimes by a substantial amount on a 30-year term.
No PMI. Crossing the 20% threshold removes that extra monthly cost entirely.
More equity from day one. A bigger down payment gives you more of a cushion if home values dip, and can make your offer more competitive in a tight market.
The case for a smaller down payment
Cash flexibility. Keeping more money liquid means you're not stretched thin for moving costs, repairs, furniture, or an emergency fund — all of which tend to show up right after closing.
Opportunity cost. Money tied up in home equity isn't earning interest or growing in other investments. For some buyers, putting less down and keeping the difference invested or in savings makes more sense than maximizing equity in one asset.
Low-down-payment programs exist for a reason. FHA loans, conventional loans with as little as 3-5% down for qualifying buyers, VA loans for eligible veterans, and USDA loans in eligible areas all exist specifically because 20% down is out of reach for many buyers — and lenders have built products around that reality.
What changes at different down payment levels
It helps to think of this as a sliding scale rather than a single cutoff:
3-5% down: The most accessible entry point. Expect PMI on top of your regular payment, and a higher loan amount means a higher principal and interest payment.
10% down: Still likely to carry PMI, but a smaller loan amount than the minimum-down scenario, and somewhat lower monthly costs.
20% down: The point where PMI typically disappears entirely — often the biggest single jump in "value per dollar" of down payment.
25%+ down: Each additional dollar still reduces your loan amount and interest paid, but the returns are more gradual. At this point it's worth weighing whether that money might do more for you elsewhere.
Key takeaway
There's no universally "right" down payment — there's a trade-off between your monthly payment, how much cash you keep on hand, and how long you plan to stay in the home. The 20% line matters mainly because of PMI, not because it's a magic number.
Find your number
The affordability calculator below shows how different down payment amounts change your estimated monthly payment, your maximum home price under common lending guidelines, and whether PMI applies — so you can compare a few scenarios side by side before deciding what makes sense for your situation.