Mason County Washington - Government Information
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Office Hours
8:30 - 4:30 M-F

Treasurer Home

Online Tax Info
Online Tax Affidavit Search

2014 Minimum Bid Sheet

Basic Real Property Tax information

Property Tax Payment Info
Credit Card Payments
Investment Policy
Tax Foreclosure General Information
Who determines the amount of your tax bill?

Forms / Brochures / Handouts

2015 Levies
2015 Levy Certification
2014 Report to the Citizens
2012 Report to the Citizens
2011 Report to the Citizens
2010 Annual Revenue Collections Report
Levy Breakdown
Year End Report
Auto Pay Cancellation Form
Auto Pay Instructions
Auto Pay Setup Form
DNR Fire Protection Assessment Form
Excise Tax Affidavits
Guide to Paying Taxes Under Protest

Property Tax Payment Information


Have your tax payment automatically deducted from your bank checking or savings account, on the due date. Click here to get the enrollment form.

Pay Online or by Phone

Visit our credit card payment information section

Pay by Mail

Return your tax statement(s) and check made payable to MASON COUNTY TREASURER, in the envelope provided to you, to PO BOX 429, SHELTON WA 98584-0429. If you wish a receipt, please enclose a written request with your payment otherwise your check is your receipt. Taxes are due April 30th and October 31st of each year. The postmark (US Post Office Cancellation) is the determining payment date for all mailed payments (RCW 1.12.070). To comply with this state regulation, all mail is reviewed by postmark date for payment of property taxes and assessments. NOTE: Postage machine dates are not valid. If you drop your mail into any mail receptacle, you must make certain the US Post Office cancellation will be appropriate for legal payment date. Payments with late postmarks will be returned for applicable interest and penalty charges.

Pay in Person

Our office hours are 8:30 am to 12:30 pm and 1:30 pm to 4:30 pm, Monday through Friday. We are located in the Mason County Building 1, 411 N 5th Street, Shelton, Washington, on the 2nd floor. A payment drop box is available at our counter during tax time.

**Please note that current law does not allow for partial payments.

A $30 service fee is charged on all returned checks and payments will be voided for each parcel’s taxes paid by that check. This $30 service fee applies to Automatic Tax Payments that funds are not available for. Each account is then subject to applicable interest, penalty and costs.

All accounts accrue interest at 1% per month on the FULL amount owing; a 3% penalty is added on June 1st and 8% penalty is added on December 1st. Administrative costs are added during the personal property distraint and real property foreclosure collection process. Personal property includes Mobile Homes, BoatHouses, Farm Equipment, Businesses and Leased Equipment.

Certified funds (bank-certified, cashier checks and cash) are required on all delinquent accounts for personal property distraint and real property foreclosure.