Fannie Mae Guidelines: Temporary Interest Rate Buydowns

What Is a Temporary Interest Rate Buydown

A temporary interest rate buydown reduces your mortgage payment for a limited period by having someone pay part of your interest upfront. The most common version is a 2-1 buydown, where your rate drops 2% in year one and 1% in year two before returning to the full note rate in year three.

Say you get a 30-year fixed loan at 7% with a 2-1 buydown. Your payments would be calculated at 5% in year one, 6% in year two, and 7% for the remaining 28 years. Someone deposits enough money into a special account to cover the difference between what you pay and what the full payment would be.

The key point: you still qualify based on the 7% rate. The lender underwrites your application as if you'll be making the full payment from day one, even though the buydown temporarily reduces what you actually pay.

Who Can Fund Your Buydown

Several parties can provide buydown funds, each with different rules.

Seller-funded buydowns are the most common. The home seller deposits money into the buydown account as part of the transaction. This counts toward Fannie Mae's interested party contribution limits, which cap seller contributions at 3% to 9% of the sales price depending on your down payment [[B3-4.1-02]].

Lender-funded buydowns come from your mortgage company. The lender might offer this as a promotion or competitive tool. When the lender funds the buydown, they must transfer the account to any new servicer if your loan gets sold.

Family members or employers can also fund buydowns. These follow the same rules as other gift funds, requiring proper documentation and gift letters.

Required Documentation

Your lender needs specific paperwork to process a buydown loan.

The buydown agreement is the central document. This written contract between you and whoever is funding the buydown spells out all terms: how much money goes into the account, when payments get reduced, and what happens to leftover funds if you pay off the loan early.

You'll also need a copy of the purchase contract if the seller is funding the buydown. The contract should show the buydown as part of the seller's contributions to closing costs.

For gift-funded buydowns, expect the same documentation required for any gift funds: a gift letter stating the money doesn't need to be repaid, bank statements showing the donor has the funds, and proof the money was transferred.

How Lenders Qualify You

Fannie Mae requires lenders to qualify you based on the full note rate, not the temporary buydown rate. This protects you from payment shock when the buydown period ends.

Using our 7% loan example, the lender calculates your debt-to-income ratio using the payment at 7%, not the reduced payments at 5% or 6%. You need to prove you can afford the full payment even though you won't make it initially.

This qualification method differs from some other loan programs. With an ARM, lenders might qualify you at the initial rate. With buydowns, there's no such break.

The logic makes sense: the buydown is temporary assistance, not a permanent payment reduction. Fannie Mae wants assurance you can handle the full payment when the help runs out.

Buydown Account Rules

The buydown account operates under strict guidelines that protect all parties.

The account must be fully funded before your loan closes. No partial funding or promises to add money later. The lender won't complete your purchase until every dollar is deposited in a custodial bank account.

You have no direct access to this money. Your only right is to have it applied to reduce your payments as scheduled. You can't withdraw funds for other purposes or use them to catch up on missed payments.

If you sell or refinance during the buydown period, leftover funds typically get credited toward your payoff amount. Some agreements allow the funds to return to whoever provided them originally.

Property and Transaction Restrictions

Fannie Mae limits which properties and transactions can use temporary buydowns.

Eligible properties include primary residences and second homes. Investment properties cannot use buydowns under any circumstances.

Prohibited transactions include cash-out refinances. You can use a buydown for a rate-and-term refinance of your primary residence or second home, but not if you're taking cash out above standard closing costs.

ARM restrictions apply to adjustable-rate mortgages. Most ARM products don't allow buydowns, though some exceptions exist. Check the specific ARM plan requirements if you're considering an adjustable-rate loan with a buydown.

Common Buydown Structures

Fannie Mae allows various buydown patterns as long as they follow the basic rules.

2-1 buydowns reduce your rate by 2% in year one and 1% in year two. This is the most popular structure because it provides meaningful payment relief while staying within Fannie Mae's limits.

1-1-1 buydowns reduce your rate by 1% for three consecutive years. This spreads the benefit over a longer period with smaller annual increases.

3-2-1 buydowns provide the maximum allowed reduction: 3% in year one, 2% in year two, and 1% in year three. These require substantial upfront funding but offer the most payment relief.

Custom structures are possible as long as the rate reduction never exceeds 3% and annual increases stay at 1% or less. You could do a 1-0.5 buydown or other variations that fit your situation.

What Could Go Wrong

Several scenarios can complicate buydown transactions.

Funding shortfalls occur when the calculated buydown amount proves insufficient. Interest rate changes between application and closing can affect the required deposit. Always verify the final funding amount before closing.

Servicing transfers can create confusion about buydown accounts. When your loan gets sold to a new servicer, the buydown account must transfer too. Occasionally, communication gaps cause temporary payment processing issues.

Early payoff complications arise when borrowers refinance or sell during the buydown period. While agreements typically address leftover funds, disputes can occur over who gets the money and when.

Qualification challenges surprise some borrowers who assume they'll qualify at the buydown rate. Remember: underwriting happens at the full note rate. If you're stretching to qualify, a buydown won't help with approval.

MBS Pool Limitations

Lenders who sell loans to Fannie Mae face restrictions on buydown concentrations in mortgage-backed securities pools.

Significant buydowns like 3-2-1 structures have limits on how many can be included in a single MBS pool [[C3-2-01]]. This doesn't affect your ability to get a buydown loan, but it might influence your lender's willingness to offer certain structures.

Moderate buydowns like 2-1 or 1-1-1 plans face fewer pooling restrictions. These are generally easier for lenders to manage in their loan sales to Fannie Mae.

References

For the official guidelines, see B2-1.4-04: Temporary Interest Rate Buydowns in the Fannie Mae Selling Guide.