Homebuilders sometimes advertise mortgage rates below broader market averages. Those offers can be valuable, but the headline rate rarely explains the complete transaction. It may apply only to a particular home, loan type, down payment, credit profile, occupancy, closing date, or affiliated lender—and it may require the builder to fund a temporary subsidy or discount points.
Before comparing a builder offer with another property, determine whether the advertised benefit is temporary or permanent, how much it costs, and what payment the borrower must qualify for.
What is a builder mortgage buydown?
A builder buydown uses money from the builder, lender, seller, buyer, or a combination of parties to reduce the borrower's cost. Two structures are commonly described with the same word:
- Temporary buydown: Subsidy funds reduce the borrower's payment for an initial period, but the mortgage note keeps its full rate and payment schedule.
- Permanent buydown: Discount points paid at closing reduce the mortgage's note rate for the life of that loan.
These structures have different risks. Ask for the note rate, the payment schedule, the source and amount of the subsidy, and the same loan priced without the incentive.
Temporary buydowns: the note rate does not disappear
In a 2-1 temporary buydown, the borrower's payment is commonly calculated as if the rate were two percentage points below the note rate during year one and one point below during year two. Beginning in year three, the borrower pays the full note-rate payment.
Fannie Mae's current temporary buydown requirements state that the mortgage documents reflect the permanent payment terms, the buydown cannot change the note, and the borrower is qualified using the note rate. The written agreement must also explain the subsidy.
For a hypothetical $400,000, 30-year loan with a 6.50% note rate, a 2-1 schedule would produce approximate principal-and-interest payments of:
- Year one, using 4.50% for the subsidized payment: $2,027 per month
- Year two, using 5.50%: $2,271 per month
- Year three and later, at the 6.50% note rate: $2,528 per month
Taxes, insurance, mortgage insurance, dues, and other costs are excluded. The buyer remains responsible for the note payment if the subsidy is unavailable. Underwrite the household budget using the full payment—not the first-year payment.
Fannie Mae also lists investment properties as ineligible for temporary buydowns under this program. Other loan programs can have different rules, so investors must confirm eligibility instead of assuming a consumer builder promotion applies to a rental purchase.
Permanent buydowns: lower rate, higher upfront cost
A permanent buydown usually means paying discount points to obtain a lower note rate. The CFPB explains that points trade upfront cost for a lower interest rate. One point equals 1% of the loan amount, but one point does not reduce every loan by the same number of percentage points.
If the builder pays those points, the offer can reduce the buyer's permanent payment. But it still has an economic cost. The builder may be less willing to reduce the price or provide another concession, and financing-concession limits can apply.
Fannie Mae's interested-party contribution rules include builder-funded temporary and permanent buydown costs in the applicable contribution calculation. The lender must disclose and approve the structure.
Compare the buydown with a price reduction
A lower payment is not automatically a better deal than a lower price. Ask the builder for alternatives in writing, such as:
- The advertised buydown package
- The same home with a price reduction instead
- The same home with closing-cost credits
- The same home with no builder financing incentive
Then obtain comparable Loan Estimates. A price reduction can lower the principal, down payment, taxes in some jurisdictions, and resale basis. A permanent rate reduction may create more monthly savings when the loan will be held long enough. A temporary subsidy mainly changes payment timing.
There is no universal winner. Compare cash to close, principal balance, monthly payments, total five-year cost, and the likely time you will keep the loan and property.
Read the advertised rate's assumptions
Before visiting a model home, capture the advertisement and its fine print. Verify:
- Which homes or inventory units qualify
- Whether the rate is temporary or the actual note rate
- Required loan type, term, down payment, and occupancy
- Credit-score or other underwriting assumptions
- Points, origination charges, and annual percentage rate
- Required use of an affiliated or preferred lender
- Contract and closing deadlines
- Whether the offer can be combined with price or closing-cost concessions
An advertised rate is not a loan approval. A buyer's actual offer can change after underwriting, appraisal, or changes to the application.
Compare Loan Estimates, not sales-office worksheets
The CFPB's Loan Estimate explainer shows where to review the rate, monthly payment, closing costs, points, lender credits, and cash to close. Request an official Loan Estimate from the builder's lender and at least two outside lenders for the same loan structure.
For an apples-to-apples comparison:
- Use the same purchase price and loan amount
- Use the same loan type and term
- Use the same rate-lock period
- Compare the same number of points
- Separate temporary payment subsidies from permanent rate reductions
- Compare APR and five-year cost, not only the first payment
An outside lender may not match a builder-funded incentive, but the comparison reveals the incentive's actual value and whether other fees offset part of it.
Do not assume you will refinance before the payment rises
A temporary buydown can be appropriate when the full note payment already fits the budget. It should not depend on rates declining before the subsidy ends. Refinancing depends on future rates, credit, income, property value, eligibility, and closing costs.
If the full payment is unaffordable today, the temporary payment does not solve that problem. Review our guide to mortgage-rate changes and deal stress testing before building a plan around a future refinance.
Builder-buyer due diligence
Financing is only one part of a new-home purchase. Also investigate:
- Independent inspection rights and construction milestones
- Builder warranty terms and exclusions
- Homeowners association documents and future dues
- Property taxes after the home is fully assessed
- Insurance availability and cost
- Comparable completed-home prices and resale supply
- Deposit refundability if financing, appraisal, or inspection fails
A favorable rate does not compensate for an inflated price, unsuitable location, poor construction, or restrictive contract.
If an existing home is being considered instead, compare the builder offer with other financing paths, including an approved FHA, VA, or USDA mortgage assumption. Eligible owner-occupants should also investigate down payment assistance programs, while recognizing that assistance has its own rules.
How JustPropertySearch fits
JustPropertySearch can help you research properties across markets with multi-location search and monitor candidates in Live Lists. It does not display or guarantee a builder's private financing terms. Confirm every incentive with the builder and lender, and review our data methodology for the limits of property records.
Builder buydown checklist
Before signing, confirm in writing:
- Note rate and complete payment schedule
- Temporary subsidy amount and funding source
- Permanent points and their dollar cost
- APR, five-year cost, and cash to close
- Full payment used for borrower qualification
- Occupancy and property eligibility
- Contribution limits and appraisal treatment
- Lock expiration and deadline-extension policy
- Price-reduction and credit alternatives
- Contract exits if financing or appraisal fails
The bottom line
A builder buydown can reduce early payments or permanently reduce the note rate, but those are different benefits. Price the same home and loan with and without the incentive, qualify using the full obligation, and compare official disclosures before choosing the headline rate.
This article provides general educational information, not legal, tax, lending, or investment advice. Builder promotions and underwriting rules change. Consult licensed professionals about a specific transaction.
