Published:
September 1, 2024
Last updated:
May 13, 2026
How Washington State Property Taxes Affect Your Mortgage Payments

Key Takeaways

  • Washington property taxes are usually included in monthly mortgage payments through escrow.
  • Homes in Washington are assessed at 100% of fair market value, often using comparable sales.
  • Washington limits property tax rates to 1% of a home’s fair value, or $10 per $1,000.
  • If an assessment seems too high, homeowners can dispute it with the county assessor and appeal to the Board of Equalization.
In This Article

You probably already know that a typical mortgage payment includes both the principal and interest. But did you know property taxes often get lumped in as well?

Property taxes are actually one of several components that can influence the size of your monthly payments. So it’s important to understand what they are and where they come from.

In this guide, we’ll look at how Washington State property taxes affect your mortgage payments, and how those taxes are determined.

A Crash Course in Washington State Property Taxes

In Washington state, all real estate property is subject to taxation unless it’s specifically exempted by law. This applies to detached homes, condos, townhomes, and other types of housing units.

According to the Washington State Department of Revenue, property taxes account for roughly 30% of the state and local taxes. The state uses these revenues for a wide range of purposes, but mainly for public schools, libraries, parks and recreation, and fire protection.

Washington property tax law requires county tax assessors to appraise homes at 100% of their fair market value. This is the amount that a buyer would be willing to pay for the property, based on current market conditions and the home’s unique features.

County tax assessors can use a variety of methods to determine the fair market value of a home. In the state of Washington, they typically use one of the following methods:

  • Market or sales comparison: This is the most common method in Washington. With this approach, the property value is estimated by reviewing multiple sales of similar properties. This is what real estate agents refer to as comparable sales or “comps.”
  • Cost approach: This method estimates the property value based on how much it would cost to replace the structure with a similar one that serves the same purpose. It’s mostly used to value new construction, rather than existing homes.

The Washington state constitution limits the annual property tax rate for individual properties to 1% of their fair value (or $10 per $1,000). This is often referred to as the “$10 limit.”

All counties in the state revalue properties annually. County officials must also conduct a physical inspection at once every six years, according to state law.

How Property Taxes Affect Mortgage Payments

Your property taxes can affect the size of your monthly mortgage payments, though to a lesser degree when compared to the principal and interest.

In a typical mortgage scenario, the monthly payments consist of four individual components. The acronym PITI is often used to describe these four components.

Here’s what PITI stands for:

  • P = Principal: This is the actual amount of money you borrow to purchase a home. Each mortgage payment you make reduces the outstanding principal.
  • I = Interest: This is the cost of borrowing money from a lender, expressed as a percentage of the loan amount. Interest is paid monthly as part of each mortgage payment.
  • T = Taxes: These are the property taxes assessed by the local government, which are based on the value of the home. Property taxes are usually held in an escrow account and paid monthly as part of the mortgage payments.
  • I = Insurance: Homeowners insurance offers protection from damages or loss caused by a variety of hazards. Mortgage lenders typically require this insurance to protect their investment. The monthly premium gets rolled into the mortgage payment.

The principal and interest make up the bulk of the monthly mortgage payments, while the property taxes and insurance typically make up a smaller portion.

It’s important to understand how all of these things are connected. If the county reassesses your home and adjusts the value upward, it could result in higher property taxes and a bigger monthly mortgage payment.

How to Challenge Your Assessed Value

If you believe that your home has been overvalued for tax purposes, you can dispute the Washington property tax assessment. Here’s a step-by-step guide based on the official guidelines from the state’s Department of Revenue:

1. Contact your county assessor’s office.

This should always be the first step. Discuss your concerns with the assessor and try to reach an agreement. Often, disagreements can be resolved directly at this level. You can also request the comparable sales information that the assessor used to determine your property’s value.

2. File an appeal with the county Board of Equalization (BOE).

If you can’t settle with the assessor, file an appeal with the BOE. Get the appeal form from the assessor’s office, BOE office, or download it here: https://dor.wa.gov/forms-publications/forms-subject/property-tax-forms

3. Meet the filing deadline for your BOE.

The completed petition must be filed with the BOE by July 1 of the assessment year you are appealing, or within 30 days of the date the change of value notice was mailed, whichever is later. Some counties offer extensions up to 60 days. Check with your BOE (where the property is located) for their specific deadline.

4.  Gather evidence to support your claim.

Don’t just say the valuation is too high. Provide concrete evidence to support your claim. This can include a recent property appraisal, examples of similar properties that sold for less, or proof of excessive deterioration that might lower your home’s value.

5. File the completed petition with the BOE.

Submit the appeal form with all supporting evidence by the deadline. The BOE will review your case and issue a decision. If you or the assessor disagree with the BOE’s decision, you can appeal further to the State Board of Tax Appeals (BTA).

To successfully challenge your assessed value, you have to provide strong market evidence that contradicts it. Your goal is to provide evidence that clearly shows the assessed value does not align with the current market value of the home.

Key Points to Take Away From This

We’ve covered some important information here that all Washington home buyers and homeowners should know. So let’s summarize the key takeaways:

  • Property taxes are included in mortgage payments in Washington State. They are one of the components that influence the size of your monthly payments.
  • Washington state property taxes contribute to public services including schools, libraries, parks, and fire protection.
  • Homes are assessed at 100% of fair market value. County tax assessors in Washington use methods like sales comparisons and cost approaches to determine this value.
  • The tax rate is limited to 1% of the property’s fair market value. This is also known as the $10 limit per $1,000.
  • Property taxes affect your mortgage payment. If your home’s assessed value increases, your property taxes and monthly mortgage payment could rise as well.
  • You can challenge your property assessment. If you believe your home is overvalued, you can conduct a property tax dispute in Washington by contacting your county assessor and, if necessary, filing an appeal.

Real estate taxes in Washington are just part of the overall cost of homeownership. While having a home that’s valued at a high price is great for equity purposes, it also means that you’re paying more in property taxes. It’s important to know how your Washington State property taxes affect your mortgage payments so you can budget accordingly.

Have Mortgage Questions?

Are you thinking of buying a home some time soon? If so, we’re here to help. Sammamish Mortgage works with home buyers and homeowners all across the state of Washington, as well as Colorado, Idaho, Oregon, and California. Since 1992, we’ve been offering multiple mortgage programs with flexible qualification criteria to borrowers across the Pacific Northwest, including our Diamond Homebuyer ProgramCash Buyer Program, and Bridge Loans. Visit our website to get an instant rate quote or to use our online mortgage calculator. Or, contact us if you’re ready to get pre-approved for a mortgage.

FAQs

Are property taxes included in mortgage payments in Washington State?

They often are. Many lenders collect property taxes through an escrow account and include a portion of the annual tax bill in the monthly mortgage payment.

How do property taxes affect a monthly mortgage payment?

Property taxes increase the total monthly housing payment when they are escrowed with the loan. If the assessed value or tax amount rises, the monthly payment can also go up.

What does PITI mean on a mortgage payment?

PITI stands for principal, interest, taxes, and insurance. These are the four common parts of a monthly mortgage payment.

How are homes assessed for property taxes in Washington State?

County assessors appraise homes at 100% of fair market value, which is the amount a typical buyer would likely pay based on market conditions and property features.

What methods do Washington county assessors use to value homes?

They commonly use the market or sales comparison approach and, in some cases, the cost approach. The sales comparison method is typically the most common for existing homes.

Is there a limit on property tax rates in Washington State?

Yes. The Washington State constitution limits the annual property tax rate for individual properties to 1% of fair value, often described as the $10 per $1,000 limit.

How often are properties revalued in Washington State?

Counties revalue properties annually, and state law also requires a physical inspection at least once every six years.

Why might my mortgage payment increase even if my interest rate stays the same?

A higher property tax bill or a change in insurance costs can raise the monthly payment even when the loan’s principal and interest stay unchanged.

Can I challenge my property tax assessment in Washington State?

Yes. A homeowner can first contact the county assessor’s office and, if needed, file an appeal with the county Board of Equalization.

What evidence can help when appealing a property tax assessment in Washington?

Useful evidence can include a recent appraisal, comparable sales showing lower values, or documentation of property condition problems that affect market value.