King County Washington Senior and Disabled Property Tax Relief

Last updated: May 16, 2026. This guide is written for King County, Washington homeowners, disabled homeowners, family helpers, and people trying to understand disability-related property tax relief.

The three paths people mix up

King County property tax relief can mean several different things. The right choice depends on the problem you are trying to solve.

What the senior and disabled exemption does

Washington’s senior citizen and people with disabilities exemption may reduce the property tax owed on a qualifying primary residence. It can also freeze the taxable value of the residence for property tax purposes. A frozen value does not mean the home stops being appraised. It means the taxes are calculated using the protected value rules if the homeowner stays eligible.

King County’s guide says the exemption can apply to a primary residence and up to one acre of land. It also says a mobile home may qualify, even if the land under the mobile home is leased or rented. The exact result depends on your income level, property value, levy rates, and the tax year.

The important point is this: an exemption is a reduction. It is not a loan. It does not have to be repaid as long as the approval was correct and you continue to meet the rules.

Who may qualify in King County

For the exemption, Washington Department of Revenue guidance says the applicant must own and occupy a primary residence in Washington, have qualifying income, and meet an age, disability, disabled-veteran, or continuing-surviving-spouse rule.

For a 2026 King County exemption application, the county form asks whether the applicant was age 61 or older on December 31, 2025. It also allows an application based on a disability determination effective on or before that date. Disabled veterans have a separate box on the county form for an 80% service-connected evaluation or compensation at the 100% rate due to service-connected disability for that application year.

State law and forms can change. If you are applying as a disabled veteran, or if you are helping a surviving spouse or domestic partner, check the current King County form for the exact tax year before relying on an older rule.

King County exemption income numbers for 2026 taxes

For property taxes due in 2026, King County’s paper application says 2025 income documents are required. It lists the following combined disposable income ranges:

The Washington Department of Revenue publishes county income thresholds. For tax years 2024 through 2026, the state threshold table lists King County exemption thresholds of $60,000, $72,000, and $84,000, and a senior/disabled deferral threshold of $88,998.

Because the income year and the tax year are not the same thing, match your documents to the application year. A 2026 property tax exemption application asks for 2025 income documents. A future application may use different income numbers.

Documents to gather before applying

Most delays happen because the county needs proof. Before you start, gather documents that match your situation. You may not need every item on this list, but these are common:

• Parcel number or property tax account number.
• Photo ID, driver’s license, passport, or birth certificate for age proof.
• Disability award letter from SSA or VA, or a King County proof-of-disability statement if disability is the basis for applying.
• Full federal tax return if you file one.
• SSA-1099, 1099-R, W-2, 1099-DIV, 1099-INT, pension, IRA, annuity, rental, business, capital gain, and other income documents if they apply.
• Receipts or paid invoices for deductible medical or care expenses, such as certain prescription drugs, Medicare premiums, in-home care, long-term care insurance, durable medical equipment, medically prescribed oxygen, and similar items listed in the county instructions.
• Trust documents, deed, life-estate documents, co-op share certificate, or other ownership proof if your ownership is not simple.
• Death certificate or divorce/legal-separation documents if family status affects the application.
• Power of attorney document if someone signs for the applicant.

King County’s paper instructions tell applicants not to email personal documents for security reasons and to redact Social Security numbers and account numbers before submitting documents. Use the current filing instructions from the King County forms page or the online application portal.

How to apply in King County

King County recommends applying online for faster service. You can start through the county’s senior exemption portal. Paper applications are also posted on the county forms page.

Use the application for the property tax year you are asking about. Do not send a 2024 form for a 2026 application unless the county specifically tells you to. The form year matters because income documents, thresholds, and instructions can change.

After you apply, King County says it sends an acknowledgment by email or letter. The county may approve the application, deny it with reasons and appeal rights, or ask for more information. If you get a request for more documents, answer it quickly. The county instructions say additional documentation may be requested in writing, and the applicant may have a 30-day window from the request letter to submit it.

What can go wrong with an exemption

A denial does not always mean the person was never eligible. Sometimes the problem is missing paperwork, the wrong income year, a misunderstanding about combined disposable income, or proof that does not match the rule.

Common problems include:

• Using federal taxable income instead of Washington combined disposable income.
• Forgetting Social Security, pension, annuity, interest, dividends, or capital gains that must be counted.
• Not attaching proof of disability.
• Not proving ownership or occupancy.
• Applying for the wrong tax year.
• Missing a renewal request.
• Not reporting a change in income, ownership, occupancy, disability status, or living situation.

If you are approved, keep copies of the approval and the documents you used. Washington rules require renewal at least once every six years, as directed by the assessor. A homeowner must also report changes that affect eligibility. King County and state rules warn that incorrect information can lead to back taxes, interest, and penalties.

When a deferral may be the better question

A deferral is different from an exemption. An exemption can reduce the tax. A deferral delays payment. For a deferral, the Washington Department of Revenue pays the taxes on your behalf, and the amount you defer must be repaid with interest when a triggering event happens.

King County’s senior or disabled page says you may qualify for a deferral if you are age 60 or older, or retired because of physical disability, own and live in the home, meet an income limit, and meet equity requirements. For 2025 income, the King County page lists the senior or disabled deferral threshold as $88,998.

Deferral rules are serious because the deferred taxes and interest become a lien on the property. The state deferral brochure says taxes deferred on or after January 1, 2007 accrue interest at 5% annually. It also says repayment is triggered if ownership is transferred, the applicant no longer permanently resides at the residence, the property is condemned, required insurance is not maintained in a way that protects the state, or the applicant dies unless a qualifying surviving spouse, domestic partner, heir, or devisee files and qualifies within the required time.

If the bill is high because the value is high

Sometimes the right issue is not senior or disabled relief. The issue may be the assessed value. A relief application usually looks at age, disability, income, ownership, and occupancy. A value appeal looks at whether the Assessor’s market value is too high for the assessment date.

For a King County valuation appeal, the Board of Equalization says petitions must be filed by the later of July 1 of the assessment year or within 60 days from the mailing date printed on the value notice or other notice of determination. Separate petitions are needed for separate parcels.

Use facts, not hardship alone. Stronger appeal evidence may include recent comparable sales, property condition problems, incorrect property records, square footage errors, zoning or access issues, or other facts showing the assessed value is above market value. A high tax bill by itself usually is not enough.

King County says the Assessor sends a response at least 21 business days before the hearing, and evidence must also be submitted at least 21 business days before the hearing. The Board sends its decision after the hearing. If either side disagrees, a further appeal can be filed with the Washington State Board of Tax Appeals within 30 days of the mailing date of the Board’s decision.

If your exemption or deferral was denied

Read the denial letter before doing anything else. Look for the reason, the deadline, the form named in the letter, and whether the county is asking for missing documents.

King County’s Board of Equalization forms page includes an Exemption Petition form for appealing the Assessor’s exemption, deferral, or destroyed-property determination, including a Senior Citizen Exemption denial. This is separate from the standard real property petition used to appeal assessed value.

If the denial is about missing proof, gather the exact documents requested. If it is about income, ask for a clear explanation of how the county calculated combined disposable income. If it is about disability, check whether the county needs an SSA or VA award letter, or a proof-of-disability statement signed by a physician.

If you are late or confused

Do not guess. Contact the office that handles the specific problem.

• For senior, disabled, or disabled-veteran exemption questions, contact the King County Assessor’s exemption unit or use the county’s online application page.
• For senior or disabled deferral questions, contact King County’s deferral staff and ask how the lien and repayment rules would apply.
• For a value appeal deadline, contact the King County Board of Equalization.
• For a denial appeal, use the form that matches the denial, not the form for a different problem.
• If you are facing tax foreclosure, contact the county immediately and consider contacting a legal-aid office. Do not wait for the next bill cycle.

The Board of Equalization forms page also lists forms for certain late-filing situations, such as waiver or no-notice issues. These are not automatic approvals. They are options to review when you missed a deadline and have a reason the Board is allowed to consider.

Official places to verify before acting

For applications and county instructions, start with the King County Assessor senior or disabled relief page and the King County forms page. For statewide rules, use the Washington Department of Revenue pages for senior and disabled exemptions, property tax exemptions and deferrals, and income thresholds. For appeals, use the King County pages for how to appeal and appeal forms.