A $40 returned item fee will be assessed on all payment types returned by the bank to the Treasurer’s Office for any reason. Payments will be voided for each parcel’s taxes paid by that payment type. Taxes are then subject to delinquent charges.


Certified funds (bank certified, cashier’s checks and cash) are required for payment on all delinquent accounts subject to personal property distraint or property tax foreclosure.


Taxes are due on April 30th each year. Taxes $50 or more can be paid in two installments, half being due on or before April 30th and the second half due on or before October 31st of each year. There is NO grace period. The postmark (US Post Office Cancellation) is the determining payment date for all mailed payments (RCW 1.12.070). To comply with state statute, all payments are reviewed by postmark date to determine if they are on time. NOTE: The date written on your check will not be considered the payment date. If you drop your payment into any mail receptacle, you must make certain the US Postal Service postmark will be appropriate for the legal payment date. We are not responsible for US Postal Service postmarks. This is between the taxpayer and the US Postal Service. Please check with your local US Postal Service office for pick up and mail delivery cut off times. We suggest mailing early three (3) to (5) days early.

If a due date falls on a Saturday or Sunday, the next Monday is the acceptable due date for payments to be considered on time.


Per RCW 84.56.020 (5) Delinquent Tax Payments: Interest, penalties are as follows:

Until December 31, 2022, the interest rate is 12 percent per annum for all nonresidential real property, residential real property, and personal property. Penalties on delinquent taxes under this section may not be assessed beginning January 1, 2022 through December 31, 2022.

Beginning January 1, 2023, the interest rates are as follows:

Nine (9) percent per annum for all residential real property with four or fewer units per taxable parcel, including manufactured/mobile homes for taxes levied in 2023 and after.

Twelve (12) percent per annum for all other property.

Beginning January 1, 2023, the penalties are as follows:

Delinquent taxes are subject to penalties on nonresidential real property, residential real property with greater than four units per taxable parcel and personal property.

A penalty of three (3) percent of the amount of tax delinquent is assessed on June 1st of the year in which the tax is due.

An additional penalty of eight (8) percent is assessed on the delinquent tax amount on December 1st of the year in which the tax is due.

Penalties may not be assessed on residential real property with four or fewer units per taxable parcel, including manufactured/mobile homes.

Administrative collection costs are added during the personal property distraint and real property collection and foreclosure process.

Business Personal Property is subject to distraint proceedings as soon as it becomes delinquent in the year it is billed.

Personal Mobile Homes are subject to distraint proceedings three years from the tax due date.

Real Property is subject to foreclosure proceedings three years from the tax due date.


Real Property taxes – assessed on land and improvements – (Please note that improvements can include any well, septic, driveway, home, out buildings and mobile homes not assessed as personal property).

Personal Property taxes – include mobile homes not assessed as real property, boat houses, farm equipment, business equipment and leased equipment.


Have your tax payment automatically deducted from your US bank checking or savings account on its due date April 30th and October 31st. Click here for more information.


You may pay online by visiting Paydici. Enter your parcel number and then follow the instructions to pay. A convenience fee will be charged.

Point and Pay Automated Phone Payment System – 1-855-331-3631

Online/Phone Payment Fees

There are fees associated with these payment options, pursuant to RCW 36.29.190. “County Treasurers are authorized to accept electronic payments for payment of any kind including, but not limited to, payment of taxes, fines, interest, penalties, special assessments, fees, rates, charges, or moneys due counties. ………. A payer using electronic payment must pay the transaction processing cost…..”

The Mason County Treasurer contracts with a third-party vendor for credit/debit card and e-check services. Mason County does not receive the fees associated with these types of payments. The fees associated with these payments are charged by our third-party vendor Point and Pay.


  • Credit Cards – 2.5% of the amount due, a minimum of $2.00
  • Visa and Mastercard Debit Cards – Flat rate of $3.95 (Note: this option is only available for over the counter or online payments).
  • E-check – Flat rate of $1.25 (Note: this option is only available for over the counter and online payments).

Please note that payments made over the counter, online or by phone using electronic payment methods will NOT be posted the same day. The Treasurer’s office will receive next day confirmation of your payment and will receive your funds within three (3) business days. We will post your payment to your account when the funds are received. Your payment ID is your confirmation receipt.


Return your tax statement(s) and check made payable to the MASON COUNTY TREASURER, in the envelope provided to you, or using your own envelope, mail to:

Mason County Treasurer's Office
PO Box 429
Shelton, WA 98584-0429

If you wish a receipt, please enclosed a written request and a postage paid return envelope with your property tax payment. Otherwise, your check is your receipt.


Office hours are 9:00 a.m. to 4:00 p.m., Monday through Friday, with the exception of legal holidays. We are located on the 2nd floor of Mason County Building 1, 411 N 5th St, Shelton, Washington.

A drive-up payment drop box is located in the alley adjacent to Mason County Building 1.