How Mortgage Payments Work in Washington
A standard mortgage payment in Washington is calculated using the amortization formula:M = P[r(1+r)^n] / [(1+r)^n - 1]
Where P is the loan principal, r is the monthly interest rate (annual rate ÷ 12), and n is the number of monthly payments. On a $575K home in Washington with a 12% down payment at 6.77% over 30 years, your principal and interest payment comes to approximately $3,289/month— not including property taxes or homeowner's insurance.
Washington's property tax rate of 0.98% adds roughly $470/month to your total housing cost on a $575K home. This rate is near the national average of ~1.1%.
Washington vs. National Average
| Metric | Washington | National Avg |
|---|---|---|
| Median Home Price | $575,000 | $420,000 |
| Property Tax Rate | 0.98% | 1.07% |
| Avg Mortgage Rate | 6.77% | 6.85% |
| Cost of Living Index | 118 | 100 |