A 2-1 buydown is one of those tools that sounds like fine print and is actually simple: someone deposits money at closing to pre-pay part of your interest, so your payment starts lower and steps up to the real number over two years. Year one, you pay as if your rate were 2% lower. Year two, as if it were 1% lower. Year three onward, you pay the actual note rate you qualified at.
The math, on a real house
Take a $395,000 loan at 6.5%. The full principal-and-interest payment is about $2,497. With a 2-1 buydown: year one is calculated at 4.5% — roughly $2,001, saving about $496 a month. Year two is calculated at 5.5% — roughly $2,243, saving about $254. The total two-year savings (about $9,000 in this example) is exactly what the seller deposits at closing. That’s the whole trick: it’s your money, parked in an escrow account, metered back into your payment monthly.
Why sellers and builders love offering it
A buydown credit sounds enormous to a buyer (“your payment drops $500/month!”) while costing the seller about the same as a modest price reduction — sometimes less. Builders in particular advertise buydowns because the headline payment moves buyers off the fence without lowering the neighborhood’s comp prices. None of that makes buydowns bad — it just means you should always run the alternative.
Buydown vs. price cut: the honest comparison
The same ~$9,000 as a price reduction lowers your payment by roughly $55/month — forever, and it shrinks your loan balance. The buydown gives you ~$496/month, then ~$254/month — temporarily. So the decision hinges on your situation:
- The buydown tends to win when the first two years are genuinely tighter than what follows: you’re early in a career with rising income, absorbing moving costs and furniture, or expecting to refinance if rates fall (unused funds are credited back).
- The price cut tends to win when you’ll hold the loan a long time at the same income, or the market gives you real negotiating leverage — permanent beats temporary given enough years.
The three flavors
2-1 (2% off year one, 1% off year two) is the workhorse. A 1-0 is the budget version — 1% off for one year, costing roughly a third as much, often the right ask in a mild negotiation. A 3-2-1 stretches three years and costs enough that a price cut usually deserves a harder look. Your agent negotiates which one the seller funds; your lender papers it.
Quick answers
Does my rate permanently change with a 2-1 buydown?
No. The note rate — the rate you qualified at — never changes. A deposit paid at closing (usually by the seller or builder) covers part of your interest for the first two years, so your payment is lower while the deposit lasts.
Who pays for a 2-1 buydown?
Almost always the seller or builder, as a concession negotiated in your offer. Lenders generally do not allow buyers to fund their own temporary buydown — and you wouldn’t want to; those dollars usually work harder elsewhere.
What happens if I refinance before the buydown ends?
Unused buydown funds are typically credited back — often toward your loan payoff. You don’t lose them. Ask your lender to walk through the exact treatment before you commit.