2-1 Buydown Explained: How Temporary Rate Buydowns Work
A 2-1 buydown is one of the more misunderstood tools in mortgage financing — often pitched hard by builders and sellers in a slow market, and often genuinely useful, but only if you understand exactly what it does and doesn't do to your loan.
What it actually is
A 2-1 buydown temporarily lowers your interest rate for the first two years of the loan, then settles at the permanent rate for the remaining term:
- Year 1: your rate is 2 percentage points below the note rate
- Year 2: your rate is 1 percentage point below the note rate
- Year 3 onward: you pay the full permanent (note) rate for the life of the loan
Your actual loan balance and permanent rate never change — only your monthly payment in years one and two is reduced.
Who actually pays for it
The discount isn't free — someone funds the difference between what you're paying and what the permanent rate would normally cost, deposited upfront into an escrow-style account. In most cases that's the seller or homebuilder, using it as an incentive to close the sale, especially in markets where buyers are rate-sensitive. It's rarely the buyer paying for their own buydown, though it's technically possible.
The single most important thing to check
Because your rate resets to the full permanent rate in year three, you need to qualify — and budget — based on that permanent payment, not the discounted year-one payment. A buydown makes the first two years easier; it does not make the loan itself cheaper or smaller. If the permanent payment would strain your budget, a temporary discount just delays that problem by two years.
2-1 buydown vs. discount points
These are often confused but work differently. Discount points are a one-time upfront payment that permanently lowers your rate for the entire loan term — you're buying a genuinely cheaper rate forever. A 2-1 buydown only delays the full rate by two years and then it's gone. Points make sense if you're confident you'll hold the loan a long time; a buydown makes more sense if you expect your income to rise, or expect to refinance before the discount period ends anyway.
When it's genuinely worth taking
A seller- or builder-paid buydown is close to free money if it's offered as a straight incentive with no price markup elsewhere in the deal. The catch to watch for: sometimes the cost of the buydown gets quietly built into a higher purchase price. Compare the same home's price with and without the buydown offer before assuming it's a pure bonus.
How we verify this: figures on this page are computed from standard published formulas and checked against our own calculators. Assumptions are stated inline. Found an error? Let us know — see our editorial approach.