Should You Put 20% Down? The Honest Math

Where the 20% rule came from

Somewhere along the way, “you need 20% down to buy a house” became gospel. It isn’t — and it hasn’t been for decades. Conventional loans allow as little as 3% down, FHA allows 3.5%, and VA and USDA loans can allow zero down for eligible buyers. What 20% actually does is remove private mortgage insurance (PMI) and shrink your loan.

So the real question isn’t “can I buy with less than 20% down?” — it’s “should I?” And that answer depends on math worth doing carefully.

The case for putting 20% down

There are genuine advantages. No PMI means a lower monthly payment. A smaller loan means less interest over time. More equity from day one gives you cushion if the market softens. And in competitive situations, a larger down payment can strengthen an offer.

If you have the 20% sitting in savings and healthy reserves left over after closing, it’s often a fine choice.

The case for putting less down

Here’s the part the rule of thumb leaves out.

Time costs money. If saving 20% takes three more years, that’s three more years of rent — with nothing building toward ownership — while home prices do whatever they’re going to do. In much of Middle Tennessee, waiting has historically been the more expensive choice, though no one can promise what the future holds.

PMI is smaller and more temporary than its reputation. On a conventional loan, PMI can be removed at 20% equity and cancels automatically at 22%. Between your payments and market appreciation, many homeowners get there faster than they expect.

Cash reserves matter more than people think. Emptying every account to hit 20% and then facing a roof repair with no savings is a worse position than paying a modest PMI premium with money in the bank. Lenders think this way too — reserves strengthen a file.

How to actually decide

Run both scenarios side by side: payment with 20% down versus payment with less down plus PMI, and look at what each leaves in your savings. My mortgage calculator estimates PMI automatically by loan program and down payment, so you can compare in about a minute.

Then pressure-test it against your life: how stable is your income, what will the house need in year one, and what does your emergency fund look like the day after closing?

There’s no universally right answer — which is exactly why this is a conversation, not a formula. Reach out and I’ll run your real numbers across both paths, with no pressure toward either one.

Blessings,

Andrew MeyersLicensed Mortgage Broker · Thrive Lending LLCNMLS #2320581 · Thrive Lending LLC NMLS #2191014

For information purposes only. This is not a commitment to lend or extend credit. All loans are subject to credit approval. Payment examples are estimates and will vary based on credit profile, loan program, and final underwriting. Equal Housing Opportunity.