Mason County seniors who own their home and live in it full-time may be eligible for a Washington State property tax exemption that can substantially reduce the annual tax bill — but the exemption is not automatic, and the clock is ticking on the April 30, 2026, first-half payment deadline. This is what homeowners 61 and older in Shelton, Belfair, Allyn, Union, and every other Mason County community need to know about qualifying, applying, and what to do in the meantime.
Who Qualifies for the Mason County Senior Property Tax Exemption
Washington State’s senior citizen and disabled-person property tax exemption is administered at the county level. To qualify in Mason County, a homeowner generally must meet all of these conditions:
- Age or disability — Be 61 years or older by December 31 of the year before the exemption takes effect, or be retired from regular employment because of a physical disability, or be a disabled veteran with an 80% or greater service-connected disability rating.
- Ownership — Own the home as of December 31 of the qualifying year, and hold the title in the applicant’s name (or through a qualifying life estate or trust).
- Primary residence — Live in the home as a primary residence for at least nine months of the year.
- Income — Have a total household disposable income of $55,000 or less per year. Mason County’s income threshold was increased to $55,000 effective for the 2024 tax year and remains the qualifying ceiling for the current program.
Income under the program includes Social Security, pensions, IRA distributions, wages, rental income, interest, and dividends. Some items can be deducted — for example, non-reimbursed medical expenses and certain long-term care costs — which means households that look over the threshold on paper may still qualify once deductions are applied.
What the Exemption Actually Does to Your Tax Bill
The exemption is tiered by income. At the lowest income tier, a qualifying senior’s property value is frozen at the level it was when they first qualified (preventing future increases from raising the tax bill) and a portion of regular levy taxes is removed. At higher income tiers within the $55,000 ceiling, the reduction is smaller but still meaningful. For many Mason County seniors on fixed incomes, the difference between qualifying and not qualifying can run into the hundreds or low thousands of dollars per year.
The exemption does not apply to special assessments like fire district fees, local improvement districts, or conservation district fees. Those remain payable in full regardless of exemption status.
How to Apply Through the Mason County Assessor
Applications for the senior and disabled exemption go through the Mason County Assessor’s Office, not the Treasurer. This is an important distinction — the Treasurer collects taxes, but the Assessor determines who qualifies for the exemption that reduces those taxes in the first place.
Questions and application packets are available at 360-427-9670, extension 491. Applicants need to provide:
- Proof of age (birth certificate, driver’s license) or proof of disability (from Social Security, VA, or a physician)
- Proof the home is the primary residence
- Documentation of total household income — typically prior-year tax returns plus Social Security and pension statements
First-time applicants should plan for the process to take several weeks after paperwork is received. Retroactive refunds may be available if it turns out the applicant has qualified for prior years and was unaware of the program.
What to Do About the April 30, 2026, Deadline in the Meantime
If a qualifying senior has not yet applied — or has applied but not yet been approved — the April 30 first-half property tax payment is still due at the full amount. Missing the deadline creates interest and penalties that accrue beginning May 1, 2026, and those charges are not waived retroactively even if the exemption is later granted.
Mason County seniors who are close to the income threshold or think they may qualify should do two things right now: (1) pay the first-half bill by April 30 through any of the three available methods — in person at 411 N. 5th Street in Shelton, by mail postmarked on time, or online/by phone through Point & Pay at 1-855-331-3631; and (2) start the exemption application process through the Assessor so it is in place for the October 31 second-half bill and future years.
For broader payment guidance on the April 30 deadline, see our complete Mason County property tax payment guide. For the full picture of how the county government works and how the Assessor and Treasurer fit together, see how Mason County government works.
The Federal Deferral Program (Different From the Exemption)
Washington State also runs a property tax deferral program for seniors and disabled residents, separate from the exemption. The deferral does not reduce the tax — it delays payment, with the deferred amount becoming a lien against the property that is collected when the property is sold or transferred. The deferral program is useful for residents whose income qualifies but who want to preserve liquidity in a given year rather than reduce the long-term cost. The Assessor’s Office can explain both options during the application conversation.
Frequently Asked Questions
What is the income limit for the Mason County senior property tax exemption in 2026?
The current income threshold for the Mason County senior and disabled-person property tax exemption is $55,000 per year in total household disposable income. Mason County raised the limit from $40,000 to $55,000 effective for the 2024 tax year, and that threshold applies to the current program. Deductions for non-reimbursed medical expenses and long-term care costs can bring households under the ceiling even if gross income looks higher.
How do I apply for the Mason County senior property tax exemption?
Applications are filed with the Mason County Assessor’s Office, not the Treasurer. Call 360-427-9670 extension 491 to request an application packet. You will need to provide proof of age or disability, proof the home is your primary residence, and documentation of your total household income from the prior year. The application is not automatic and must be renewed periodically.
Do I still have to pay the April 30 property tax bill if I’ve applied for the senior exemption?
Yes. If your exemption has not yet been approved by April 30, 2026, you must pay the first-half property tax at the full billed amount. Interest begins accruing May 1 on any unpaid balance and is not waived even if the exemption is later granted. Once the exemption is approved, future bills reflect the reduction. Ask the Assessor’s Office whether you qualify for any retroactive refund for prior years you may have been eligible but unenrolled.
What’s the difference between the senior exemption and the senior deferral in Mason County?
The senior exemption reduces the amount of property tax owed for qualifying homeowners. The senior deferral program delays payment rather than reducing it — deferred amounts become a lien on the property that is paid when the property is sold or transferred. Both are administered through the Assessor’s Office. Seniors below the income threshold can generally choose either program based on their cash-flow needs.
Does the Mason County exemption apply to all property taxes?
No. The exemption applies to regular levy property taxes. It does not apply to special assessments such as fire district fees, local improvement districts, conservation district fees, or similar non-ad-valorem charges. Those continue to be billed and owed in full regardless of exemption status. The Treasurer’s Office can explain which portions of your specific bill are and are not subject to the exemption.
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