If you are enclosing a check or money order and live in the State of Washington, please mail your federal income tax return and payment to:
Internal Revenue
Service
P.O. Box 7704
San Francisco, CA
94120-7704
Your check should be payable to United States Treasury.
In the memo section, note your full name, Social Security number, and 2018 Form 1040, if you are paying for the current year.
The State of Washington does not impose a personal income tax.