Washington property taxes are due in two equal installments: the first half on April 30 and the second half on October 31

Washington State splits the property tax year into two payment periods. The first installment covers January through June and is due by April 30. The second installment covers July through December and is due by October 31. Both dates are firm important date — if your payment arrives after these dates, the county assessor's office will charge a penalty and interest.

Your county treasurer's office sends the tax bill in the spring, usually by late March. The bill shows the total amount due for the year, the split between the two installments, and the exact due dates. If you do not receive a bill by early April, contact your county treasurer directly rather than waiting — missing a important date because you did not get the notice does not erase the penalty.

Key Takeaways

  • Property taxes in Washington are due April 30 for the first half and October 31 for the second half, with penalties applied to late payments.
  • Your county treasurer mails the tax bill in spring, and you can also pay online, by mail, or in person at the treasurer's office.
  • If you own property jointly or have a mortgage, your lender may pay taxes from an escrow account, so check your loan documents to confirm who pays.
  • Washington has no state income tax, so property tax is a primary source of local government funding and cannot be deferred or forgiven without a formal appeal.
  • If you believe your assessed value is too high, you can file a formal appeal with your county assessor, but this does not delay the tax payment important date.

How to pay your property taxes

You can pay your property taxes in several ways depending on your county. Most Washington counties accept online payments through their treasurer's website, which is the fastest method and shows confirmation when ready. You can also mail a check to your county treasurer's office — allow at least two weeks for mail delivery so the payment arrives by the important date. Some counties accept in-person payments at the treasurer's office during business hours, and a few accept credit card or electronic transfer payments, though these may carry a processing fee.

When you pay, include your property tax account number, which appears on your tax bill. If you are paying by mail, write the account number on the check itself. If you pay online, the system will ask for this number before processing. Paying without the account number can delay crediting and may result in a penalty even if the payment arrived on time.

What happens if you miss the important date

Washington State charges a penalty of 1% of the unpaid tax amount if payment arrives after the due date. Interest also accrues at a rate set by the state each year — currently around 12% annually, though this varies. The penalty and interest are added to your bill when ready, so a late payment costs more than the original tax amount.

If you remain unpaid for three years, the county can foreclose on your property and sell it to recover the taxes owed. This process is called a tax deed sale. The county must follow specific legal steps and give you notice, but the end result is loss of ownership. If you know you cannot pay by the important date, contact your county treasurer when ready to discuss a payment plan — many counties will work with you to avoid penalties if you communicate before the due date passes.

If your mortgage lender pays your taxes

If you have a mortgage, your lender may require you to pay property taxes through an escrow account. This means you pay a portion of the annual tax bill each month as part of your mortgage payment, and the lender pays the county directly on your behalf. Check your mortgage documents or contact your lender to confirm whether taxes are escrowed.

If your lender pays the taxes, you do not need to pay the county yourself — the lender handles both installments. However, you are still responsible if the lender fails to pay. Review your mortgage statement each year to confirm the tax payment was made. If you refinance your mortgage, confirm with the new lender that they will continue to pay taxes on time, as escrow arrangements sometimes change during refinancing.

Appealing your assessed property value

If you believe your property's assessed value is too high, you can file a formal appeal with your county assessor. The appeal process is separate from paying your taxes — filing an appeal does not delay or reduce the amount due on April 30 or October 31. You must still pay the full amount by the important date even while your appeal is pending.

The important date to appeal is typically 30 days after you receive your tax bill, though this varies by county. Contact your county assessor's office for the exact important date and the forms required. If your appeal is successful, the assessor will reduce your assessed value, and you may receive a refund or credit for overpaid taxes in future years. The appeal process usually takes several months, so do not expect a refund before your next tax bill arrives.

Understanding Washington's property tax system

Washington State has no income tax, which means local governments rely heavily on property taxes to fund schools, roads, and public services. Because of this, property taxes are a significant source of revenue and are enforced strictly. The state legislature sets limits on how much property tax can increase each year — currently capped at 1% annually unless a new levy is approved by voters — but this does not mean your bill will not rise.

Your property tax bill is calculated by multiplying your assessed property value by the tax rate set by your county and local taxing districts. The assessed value is determined by the county assessor based on recent sales of similar properties in your area. Even if your assessed value stays the same, your bill can increase if the tax rate rises due to new school levies or other voter-approved measures.

Frequently Asked Questions

Can I pay my property taxes in one lump sum instead of two installments?

Yes. You can pay the full year's amount by April 30 if you prefer, rather than splitting it into two payments. This does not reduce the amount owed, but it simplifies your record-keeping. Contact your county treasurer to confirm they will accept a full-year payment and to ask whether paying early earns any discount — some counties offer small reductions for early payment, though this varies.

What if I own property in multiple Washington counties?

Each county sends a separate tax bill for each property you own within that county. You must pay each bill by the same important date — April 30 and October 31 — to the respective county treasurer. Keep track of all bills and due dates, as missing a important date on any property results in penalties on that property alone.

Do I have to pay property taxes if I am retired or on a fixed income?

Property taxes are required regardless of income. However, Washington offers a property tax exemption for seniors and disabled homeowners who meet income limits. You must file for this exemption with your county assessor — it does not happen automatically. Contact your county assessor's office to learn the current income limits and required documents.

What if my property tax bill seems wrong?

First, confirm the property description and assessed value on the bill match your actual property. If there is an error — such as the wrong square footage or an extra building listed — contact your county assessor when ready. Errors can sometimes be corrected without an appeal. If the assessed value is correct but you believe it is too high compared to similar properties, file a formal appeal within 30 days of receiving the bill.

Can I deduct Washington property taxes on my federal income tax return?

Yes, if you itemize deductions on your federal return. Property taxes paid to Washington State are deductible on Schedule A (Form 1040), though there is a limit of $10,000 per year for all state and local taxes combined. Consult a tax professional to determine whether itemizing benefits you, as this depends on your total deductions and income.