Set up a separate bank account and regularly deposit collected retail sales tax or other taxes you may owe. Withdraw the funds only when you pay the taxes.To see if you qualify for an installment payment plan, attach a Form 9465, "Installment Agreement Request," to the front of your tax return. File your Washington income tax return. All tax brackets are supported. Let us put our years of experience to work for you. AARP's state tax guide on 2023 Washington tax rates for income, retirement and more for retirees and residents over 50. Please include the property tax account number on the check or money order.