How Does a 2-1 Buydown Work? Costs, Payment Jump, and Tax Treatment

A 2-1 buydown works like this: someone pays a lump sum at closing that temporarily lowers your mortgage interest rate for the first two years. In year one you pay two percentage points below your note rate, in year two you pay one point below, and from year three through the end of the loan you pay the full note rate. The money that covers the gap sits in an escrow account and is drawn down each month to pay the lender the difference between your reduced payment and the full amount owed.¹

The Rate Schedule and What You Actually Pay

The schedule is fixed and tied to the permanent rate on your promissory note. On a 7% note rate:

Year one: your effective rate is 5%.
Year two: your effective rate is 6%.
Year three through year 30: you pay the full 7%.

On a $400,000 loan at a 7% note rate, that works out to roughly $2,147 a month in principal and interest during year one, about $2,398 in year two, and about $2,661 from year three onward.¹ The lender is not forgiving any interest. The full note-rate payment is still being made each month; part comes from you, and part comes from the escrow account funded at closing.

Expect the upfront funding to run roughly $8,000 to $12,000 on a $400,000 loan, depending on the note rate and balance.

Who Pays For It

In most purchase transactions the seller or home builder funds the buydown as a concession, which is common in slower markets where sellers prefer offering a buydown to cutting the sale price. The lender can also fund it, and in some cases the buyer pays directly.¹

Whoever pays, the full amount has to be deposited into a separate escrow account at closing. That account is protected from creditors of the lender, seller, builder, and buyer. Each month the servicer pulls from it to cover the gap between your reduced payment and the full amount owed.² Your monthly statement shows only the reduced payment for the first 24 months.

Seller Concession Caps

When a seller, builder, or other interested party funds the buydown, the cost counts against the maximum interested party contribution allowed for your loan type. These caps can be the binding constraint on whether a seller can actually cover the full buydown plus your other closing costs.

For conventional loans backed by Fannie Mae, the caps depend on your loan-to-value ratio:³

LTV above 90% (down payment under 10%): 3% of sale price or appraised value, whichever is lower.
LTV of 75.01% to 90% (down payment of 10% to 25%): 6%.
LTV of 75% or less (down payment above 25%): 9%.
Investment properties: 2%, regardless of LTV.

FHA loans cap total seller concessions at 6% of the lower of sale price or appraised value, and buydown costs count toward that limit. VA loans cap seller concessions at 4% of the reasonable value of the property, and seller- or builder-funded buydowns count as concessions.¹ A buydown on a $400,000 loan can easily hit $9,000 or $10,000, which blows past the 3% cap for a low-down-payment conventional buyer once other closing costs are added in.

Whether You Can Get One

Fannie Mae permits temporary buydowns on all fixed-rate mortgages and on some adjustable-rate mortgages, with restrictions on the ARM side.² FHA allows buydowns only on fixed-rate loans; ARMs are excluded.⁴ VA loans also allow them.

Property eligibility is narrower than people expect. Under Fannie Mae guidelines, 2-1 buydowns are available for primary residences and second homes only. Investment properties don’t qualify.² FHA buydowns apply to fixed-rate loans on one-to-four-unit properties where the borrower lives in one of the units.⁴

One rule matters more than any other for approval: you have to qualify at the full note rate, not the reduced year-one or year-two rate. Your debt-to-income ratio and ability-to-repay analysis are measured against the payment you’ll owe from year three on.² VA underwriters may treat the buydown as a compensating factor in borderline cases, but the baseline qualification still uses the permanent rate.¹ A buydown cannot stretch you into a loan you otherwise couldn’t afford on paper.

If You Sell or Refinance Early

If you sell or refinance before the 24 months are up, money is left in the escrow account. Fannie Mae’s guidelines say those unused funds should be applied to your mortgage payoff balance, reducing what you need to close out the loan. The buydown agreement can also specify that the remainder goes back to you or to the lender (if the lender funded it).²

If you hold the loan through the full two-year period, the account drains on schedule and there’s nothing to refund. The funds aren’t refundable in any other scenario; your only right to them is to have them applied to your payments as they come due.²

The Year-Three Payment Jump

The main risk is the step-up when the subsidy ends. On the $400,000 example, the payment rises from about $2,398 in year two to about $2,661 in year three, roughly a $263 increase or about 11% in one month. Measured from year one, the total swing is over $500 a month.

You qualified at the full rate, so on paper you can afford it. In practice, two years of a lower payment can reshape a household budget. If income doesn’t grow as expected, or you take on new debt during the buydown period, the transition can feel sharper than the numbers suggest.⁵

Buydown vs. Discount Points

Both cost money upfront to lower your rate, but the mechanics are different. A discount point typically costs 1% of the loan amount and permanently lowers your note rate by roughly 0.25%, with the exact reduction varying by lender and market. The savings are smaller per month but run the full life of the loan.

A 2-1 buydown leaves your note rate alone and just subsidizes the first 24 payments. After month 24 you’re paying what you would have paid anyway. The savings are larger per month but concentrated in two years.

Points tend to pay off if you expect to hold the loan for many years. A 2-1 buydown tends to fit better if you expect to refinance within a few years (for example, if you think rates will fall), or if you need breathing room while your income catches up to the new housing cost. Future rate movements are never guaranteed.

When It’s Actually Worth It

A 2-1 buydown earns its keep in a few specific situations:

The seller or builder is offering it as a concession, so the cost isn’t yours. In a buyer’s market this is often preferable to a price cut from the seller’s side.
You expect your income to rise, and the lower first-year and second-year payments give you time to grow into the full payment.
You’re buying during a period of elevated rates and plan to refinance if rates drop.

If you’re paying for it yourself with no refinancing plan, putting the same money toward discount points or a larger down payment often delivers better long-term value. Fannie Mae sets no dollar cap on buydown size itself; the practical limit is usually the seller concession cap for your loan type.²

Tax Treatment

When a seller pays for your buydown, the IRS generally treats the contribution as a reduction in the home’s purchase price rather than income to you. That can lower your cost basis in the property, which may slightly increase a future capital gains calculation when you sell. The IRS applies a similar principle to seller-paid discount points, which explicitly reduce basis.⁶

Whether you can deduct interest that the subsidy covers for you is less clear. IRS Publication 936 says you cannot deduct mortgage interest paid for you under certain government assistance programs, and the same logic likely applies to seller-funded buydown subsidies, meaning you’d deduct only the portion of interest you actually paid out of pocket.⁷ The IRS has not addressed buydown subsidies in explicit published guidance, so run the deduction question past a tax professional before you rely on it.

1
Department of Veterans Affairs. Temporary Buydowns – VA Home Loans
2
Fannie Mae. B2-1.4-04, Temporary Interest Rate Buydowns
3
Fannie Mae. Interested Party Contributions (IPCs)
4
U.S. Department of Housing and Urban Development. Adjustable Rate Mortgages and Interest Buydowns
5
Federal Housing Finance Agency Office of Inspector General. Temporary Interest Rate Buydowns Dashboard
6
Internal Revenue Service. Publication 551, Basis of Assets
7
Internal Revenue Service. Publication 936, Home Mortgage Interest Deduction