Buying New Construction in Washington: Builder Rate Buydowns, REET and Tax Lags
Updated October 2026
A builder’s advertised payment can make a new Washington home look cheaper than a resale while leaving out the most important comparison: the payment after the incentive ends and the completed home reaches the property-tax roll. Evaluate the financing package alongside the purchase price, not separately.
Identify what the rate incentive buys
A temporary buydown reduces the borrower’s scheduled payment for an initial period using a funded subsidy. It does not change the note rate. Qualification generally uses the full note-rate payment. A permanent buydown instead uses discount points to reduce the contractual rate.
Request competing Loan Estimates with the same loan amount, lock period and closing assumptions. Compare:
- Note rate, annual percentage rate and discount points.
- Payment during each temporary subsidy year and afterward.
- Builder credits tied to a preferred lender or title provider.
- Price reductions available instead of financing incentives.
- Lock-extension costs if construction runs late.
Use today’s rates as a comparison starting point and model the unsubsidized payment with the monthly payment calculator. The Consumer Financial Protection Bureau provides guidance for comparing mortgage disclosures.
Read the REET allocation in the contract
Washington’s graduated state real estate excise tax applies marginally to most ordinary residential sales:
| Portion of selling price | State rate |
|---|---|
| First $525,000 | 1.10% |
| $525,000 through $1.525 million | 1.28% |
| $1.525 million through $3.025 million | 2.75% |
| Above $3.025 million | 3.00% |
Local REET commonly adds 0.25%–0.50%. Sellers generally pay REET, but builder contracts may allocate its economic cost to the buyer. Read that clause before treating a credit as a net savings. The highest applicable state rate does not apply to the entire price.
Budget for the completed assessment
An early tax estimate may reflect vacant land or partially completed construction. Ask what assessed value supports the lender’s escrow estimate and request a full-improvement estimate. A later escrow analysis can increase payments and identify a shortage.
Washington’s constitutional regular-property-tax limit generally concerns aggregate rates relative to market value; the commonly cited 1% annual levy-budget growth restriction is statutory, not a cap on an individual homeowner’s bill. New construction and voter-approved school levies complicate comparisons. Review the Washington Department of Revenue’s property-tax resources.
Before closing, reconcile completion approval, the final walkthrough, incentive funding and the expected fully assessed tax payment.
Compare Current Mortgage Rates
Compare current APRs, points, fees, and estimated monthly payments from participating lenders below.
Loan Program Comparison: 2026 Benchmarks
Buying New Construction in Washington: Builder Rate Buydowns, REET and Tax Lags — Choose a mortgage by comparing eligibility, upfront cash and total monthly costs, not the advertised rate alone. Conventional, FHA, VA and USDA serve different borrowers. Confirm county limits, taxes, insurance and lender requirements before comparing personalized Loan Estimates for your household.
Historical 2025 one-unit comparison: conforming $806,500; FHA floor $524,225. County and unit-count limits can differ.
| Loan program | Down payment / equity | 2026 one-unit baseline | Costs and page-specific comparison |
|---|---|---|---|
| Conventional | 3%–5% subject to eligibility | $832,750 | PMI generally below 20% down |
| FHA | 3.5% at 580+; 10% at 500–579 | $541,287 floor | 1.75% upfront MIP; 0.55% annual for >95% LTV, base loan ≤$726,200, term >15 years |
| VA | 0% for eligible borrowers | No VA limit with full entitlement | No monthly PMI; funding fee unless exempt |
| USDA | 0% for eligible borrowers | Income, address and repayment eligibility | Guarantee and annual fees; confirm current schedule |
| Jumbo | Lender-specific cash and reserves | Above applicable conforming limit | Lender-specific pricing and insurance |
| Home Equity / Refinance | Equity and underwriting dependent | Property and lender dependent | Compare closing costs, term and break-even |
Sources: FHFA limits; HUD FHA limits.
Editorial Methodology & Primary Sources
Verification date: Not recorded; check the primary source and lender timestamp before relying on an estimate.
Rate comparisons use participating lender feeds, not a whole-market survey or guaranteed offers. Freddie Mac PMMS is a market benchmark, not a personalized quote. Calculator models rely on published regulatory formulas and disclosed assumptions rather than fabricated first-person loan testing.
Monthly principal and interest use the amortization formula P × r / (1 − (1 + r)−n), where r is the monthly note rate and n is the number of payments; at zero interest use P / n. PITI adds monthly property taxes and homeowners insurance; PMI is separate. APR includes applicable finance charges under Regulation Z and is not the note rate used for payments. Compare lender Loan Estimates for actual APR and fees.
- Consumer Financial Protection Bureau (CFPB) — Loan Estimates, APR and borrower disclosures; Regulation Z.
- U.S. Department of Housing and Urban Development (HUD / FHA) — FHA program guidance.
- U.S. Department of Veterans Affairs (VA) — VA loan eligibility and benefits.
- Freddie Mac Primary Mortgage Market Survey (PMMS) — published rate benchmarks.
- U.S. Census state tax collections — state property tax benchmarks; confirm parcel-specific assessments and exemptions with the state revenue department and local assessor.
The payment snapshot uses illustrative annual taxes of 1% of home price, $1,200 insurance and 0.5% PMI below 20% down, not verified local quotes. Other calculators disclose their inputs and assumptions. Published guidance and lender feeds may change independently; confirm current program rules, taxes and offers before a decision.