Mason County property owners have until Thursday, April 30, 2026, to pay the first half of their 2026 property taxes. The Mason County Treasurer’s Office has confirmed that delinquent charges begin Friday, May 1, 2026, and is urging anyone who can pay early to do so before last-minute mail and online backlogs create problems. Here is the complete payment guide for every property owner from Shelton to Dewatto — what you can pay, how you can pay, what it costs, and what happens if you miss the deadline.
April 30 Is a Hard Deadline Under State Law
Under Washington state law, property tax payments of $50 or more can be split into two halves: the first due on or before April 30 and the second due on or before October 31 of the same year. Payments under $50 must be paid in full by April 30. This is not a Mason County-specific rule — every county treasurer in the state enforces the same schedule — but Mason County Treasurer’s Office has reminded local taxpayers that mail delivery times through the USPS may be delayed, so payments should be mailed well ahead of the deadline.
Payments postmarked on or before April 30 are considered on time. After that, interest and penalties accrue on the unpaid balance beginning May 1.
Three Ways to Pay Your Mason County Property Tax
The Mason County Treasurer’s Office offers three primary methods for the 2026 first-half payment.
1. Pay in Person
The Mason County Treasurer’s Office is located at 411 N. 5th Street, Shelton, WA. In-person payments accept cash, check, cashier’s check, money order, and credit or debit cards. Office hours are generally Monday through Friday during standard business hours; Mason County residents making the trip should call ahead to confirm hours on the day of payment.
2. Pay by Mail
Mail-in payments must be postmarked on or before April 30, 2026, to be considered on time. The Treasurer’s Office recommends mailing early — delivery windows through the USPS can stretch several business days, and a payment received after the deadline but postmarked on time is still credited as timely. Checks should be payable to the Mason County Treasurer and include the property account number or parcel number on the memo line.
3. Pay Online or by Phone
Mason County uses Point & Pay for online and telephone credit/debit card processing. The online portal is accessible from masoncountywa.gov, and the automated phone payment system can be reached at 1-855-331-3631. Accepted cards are Visa, MasterCard, Discover, and American Express. Visa Debit and E-Checks are not available over the phone but are available online.
A processing fee applies to credit card payments: 2.5% of the amount due, with a $2.00 minimum. E-checks carry a flat fee that is generally lower than the card fee for larger payments; the exact amount is disclosed at checkout on the Point & Pay portal.
What If You Can’t Pay the Full Amount by April 30?
Mason County offers payment plan arrangements for taxpayers who cannot pay in full by the deadline. These are not advertised on the standard payment page — they are handled case-by-case through the Treasurer’s Office at 360-427-9670, extension 475. Interest generally continues to accrue on the unpaid balance during a payment plan, so contacting the office before April 30 typically produces a better outcome than waiting until after the deadline has passed.
Senior and Disabled Property Tax Exemptions
Mason County participates in Washington State’s senior citizen and disabled-person property tax exemption program. The program can reduce or freeze the taxable value of a primary residence for qualifying owners. Eligibility generally requires the applicant to be 61 years or older, or to be disabled, and to own and occupy the home as a primary residence. The income threshold for Mason County was raised to $55,000 per year effective for the 2024 tax year and remains the current qualifying ceiling for the program.
The exemption is applied for through the Mason County Assessor’s Office, not the Treasurer, and does not happen automatically. Applicants must file paperwork and provide income documentation. Questions about qualification or how to apply can go to the Assessor’s Office at 360-427-9670, extension 491.
What Happens If You’re Late
Interest accrues on delinquent property taxes under state law. In Washington, unpaid first-half taxes accrue interest at 1% per month beginning May 1, and additional penalties compound as the tax remains unpaid. Extended delinquency can eventually place the property at risk of foreclosure, though that process plays out over multiple years and involves formal notice before any action. The Treasurer’s Office will work with property owners who contact them early; the worst outcomes almost always involve owners who do not reach out.
Why the April 30 Deadline Matters to Every Mason County Community
Property taxes fund the services that show up in every Mason County community from Shelton to Dewatto. That includes the Mason County Sheriff’s Office, county roads, district courts, public health, planning, and the county elections office that runs votes like the North Mason levy special election on April 28. A high percentage of first-half collections is what keeps those services funded through the summer months until the October 31 second-half deadline brings in the next major revenue cycle.
For a broader look at how Mason County government departments interact with each other and with residents, see our guide on how Mason County government works. Property owners weighing how the North Mason School District levy on the same election cycle affects their tax bill can also consult our coverage on what the levy means for your tax bill.
Key Contacts and Deadlines at a Glance
- First-half property tax due: Thursday, April 30, 2026
- Second-half property tax due: Saturday, October 31, 2026
- Treasurer’s Office: 411 N. 5th Street, Shelton, WA
- Treasurer general line: 360-427-9670, extension 484
- Payment plans: 360-427-9670, extension 475
- Senior/disabled exemption (Assessor): 360-427-9670, extension 491
- Automated phone payment (Point & Pay): 1-855-331-3631
- Online portal: masoncountywa.gov
Frequently Asked Questions
When is the Mason County property tax deadline in 2026?
The first-half 2026 Mason County property tax payment is due Thursday, April 30, 2026. The second-half payment is due Friday, October 31, 2026. Payments postmarked on or before the deadline are considered on time. Delinquent charges begin accruing the day after the deadline.
How do I pay my Mason County property tax online?
Mason County uses Point & Pay to process online property tax payments. Access the portal from masoncountywa.gov and select the property tax payment link. Visa, MasterCard, Discover, and American Express cards are accepted, along with E-checks. A 2.5% fee ($2.00 minimum) applies to credit card transactions. You can also pay by phone at 1-855-331-3631 using the same system.
Can I split my Mason County property tax into two payments?
Yes. Under Washington state law, any Mason County property tax bill of $50 or more can be split into two halves. The first half is due April 30 and the second half is due October 31. Bills under $50 must be paid in full by April 30. You do not need to file a special request — half-payment is the default if your bill is $50 or more.
What happens if I miss the April 30 Mason County property tax deadline?
Interest and penalties begin accruing May 1 under Washington state law. Interest is charged at 1% per month on the unpaid balance. Extended delinquency eventually places the property at risk of foreclosure, though that process takes years and involves multiple formal notices. If you cannot pay in full, contact the Treasurer’s Office at 360-427-9670 extension 475 before the deadline to discuss payment plan options.
Does Mason County have a senior property tax exemption?
Yes. Mason County participates in Washington State’s senior citizen and disabled-person property tax exemption. Owners who are 61 or older or disabled, own and occupy a primary residence in Mason County, and have an annual household income of $55,000 or less may qualify. Applications go through the Mason County Assessor’s Office at 360-427-9670 extension 491. The exemption is not automatic — you must apply and provide income documentation.
Can I set up a payment plan for Mason County property tax?
Yes. Mason County Treasurer’s Office works with property owners who cannot pay the full amount by the deadline. Payment plans are arranged case-by-case. Contact the Treasurer’s Office at 360-427-9670 extension 475 to discuss options. Interest continues to accrue during a payment plan, so reaching out before April 30 typically produces a better outcome than waiting until after the deadline.
Where is the Mason County Treasurer’s Office located?
The Mason County Treasurer’s Office is located at 411 N. 5th Street, Shelton, WA. In-person payments accept cash, check, cashier’s check, money order, and credit or debit cards. Confirm office hours at 360-427-9670 extension 484 before visiting, especially close to the April 30 deadline when lines can be long.
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