You can pay online using an electronic check, major credit card or VISA debit card. For an electronic check payment there is a $1.00 transaction fee. Credit card payments are charged a 2.50% convenience fee of the payment amount by the vendor. For a VISA debit card payment there is a $3.95 convenience fee charged by the vendor. Please note that all convenience fees are charged whether the payment is made online or in person at the office.
Online Payment Options
- Credit Card/any non-Visa Debit Card - Credit Card and any non-Visa debit card payments are charged at 2.5% convenience fee of the payment amount by the vendor.
- E-Check - A $1 transaction fee is charged by the vendor.
- Visa Debit Card (Non Business) - A convenience service fee of $3.95/transaction is charged by the vendor.
To pay using one of these methods, please click below and search for your property. From there, you can select what you would like to pay.
Property SearchPayment Due Dates
The entire year’s tax is due on or before April 30th. You may choose to pay half by April 30th and half by October 31st (if applicable). Interest and penalty will be charged on the entire principal balance. Real and Personal Property taxes less than $50.00 are due in full by April 30th. By Washington State law, the postmark is considered the received date for interest calculations. (RCW 1.12.070)
Payments By Mail/Drop Box
CHECK PAYMENTS (Endorsed to Benton County Treasurer and include Remit Coupon)
BY MAIL:
Benton County Treasurer
Tax Processing Center
7122 W Okanogan Pl #E110,
Kennewick, WA 99336
**Payments received via mail are applied according to the date of the US postmark. Please allow time for processing by the US Post Office to ensure timely payment.
DROP BOX LOCATIONS: Kennewick and Prosser drop boxes are now open. (Richland drop box will open April 15th, 2026)
Drop boxes will be closed at 5pm on the due date. (If the April 30th or October 31st due date falls on a Saturday or Sunday the due date then becomes the following Monday.)
Prosser: Benton County Courthouse, 620 Market St. Prosser, WA 99350 (MAP)
Kennewick: Benton County Administration Building, 7122 W Okanogan Pl #E110, Kennewick, WA 99336 (MAP)
Richland: Richland City Hall, 625 Swift Blvd, Richland, WA 99352 (MAP)
SEMI-ANNUAL PLAN
This program allows for two automatic withdrawals from your designated checking/savings account in April and October at no cost. Click the link below for additional information. The cutoff dates to apply for the Semi-Annual payment plan are April 15th for the first half and October 15th for the second half of each year.
ACH Semi-Annual Property Tax Payment Plan Form
MONTHLY INSTALLMENT PLAN
ACH Monthly Property Tax Payment Plan Form
INTEREST/PENALTY
Interest and penalty on delinquent payments will accrue pursuant to RCW 84.56.020. Additional collection fees will be added to delinquent Irrigation District assessments.
RETURNED PAYMENTS
A $35.00 fee will be charged for all returned payments.
PAYMENT UNDER PROTEST
To preserve your right to seek a court ordered refund, you must comply with requirements of the law per RCW 84.68.020 and WAC 458.18.215. The Treasurer's Office has no responsibility to determine if the protest is legally sufficient. The Treasurer's responsibility is limited to maintaining a file of petitions. You must make further action to file a claim on your own.
