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If you file your returns electronically, you can also amend your returns online.

By paper

  1. Make a copy of the return you need to correct.

  2. At the top, write "Amended Return" in large letters.

  3. Draw a single line through any incorrect information and write the correct information to the side or above. (Please use black ink only.)

  4. Recalculate your "Totals."

  5. If you are amending your return and you owe money, include a check when you mail the amended return.

  6. If you are seeking a refund, attach a letter explaining why you are submitting an amended return, with a telephone number where you can be reached during business hours.

    Example: " We have submitted an amended return for the January 2003 period. We discovered that our retailing and retail sales tax gross figures were overstated by $3000 because we erroneously included some December 2002 figures with our current month's figures. Please send us a refund check for overpayment. If you have any questions, we can be reached at (xxx) xxx-xxxx."

  7. Mail the amended return to:
    • Washington State Department of Revenue
    • Taxpayer Account Administration
    • PO Box 47476
    • Olympia, WA 98504-7476

  •   The Department may only honor refunds dating back four years prior to the year in which the refund request is made. WAC 458-20-229