Amend a tax return

You can change and correct previously filed tax returns. Reasons for amending a return vary. A return may need to be modified because you:

  • reported too much revenue (overpaid)
  • reported too little revenue (underpaid)
  • reported revenue under the wrong classification
  • itemized a deduction incorrectly
  • deducted too much revenue
  • need to add a deduction
  • did not explain a deduction

Request a refund if you overpaid your Seattle business license tax. We will issue you a refund for the extra amount. If you underpaid, you must pay the tax owed.

Directions to amend a return

Requesting a refund

You must request the refund in writing, either by emailing us or by mailing us a letter. You can only request a refund for tax periods that occurred within the past four calendar years. Follow these directions:

  1. Print a copy of your original tax return
    • if you filed online, access SELF and print your return
    • if you filed on paper, photocopy your original return
  2. Print any worksheets, if used
  3. Correct the return by crossing out any incorrect figures and then adding correct figures
    • make sure your corrections are legible
    • write with a blue or red pen
    • if necessary, highlight your corrections so we can easily see them
  4. If you are adding any deductions, list and describe each one
  5. Write the word "Amended" at the top of the tax form
  6. Write a refund request, addressed to the City of Seattle, that includes:
    • an explanation of each change made
    • your customer number
    • the tax period (year, quarter or month) you are amending
  7. Send us your:
    • written request for a refund
    • amended tax return
    • worksheet or deduction list, if used

Refunds take approximately 6 to 10 weeks to process. We may contact you for additional information during that time.

Email all necessary refund request material to: tax@seattle.gov.

Or mail the printed material to:
City of Seattle: Refund Request
700 Fifth Ave.
PO Box 34214
Seattle, WA 98124-4214

Owing tax

Follow these directions to amend your tax return if you owe taxes for a reporting period:

  1. Print a copy of your original tax return
    • if you filed online, access SELF and print your return
    • if you filed on paper, photocopy your original return
  2. Print any worksheets, if used
  3. Correct the return by crossing out any incorrect figures and then adding correct figures
    • make sure your corrections are legible
    • write with a blue or red pen
    • if necessary, highlight your corrections so we can easily see them
  4. If you are adding any deductions, list and describe each one
  5. Write the word "Amended" at the top of the tax form
  6. Send us your:
    • amended tax return
    • worksheet or deduction list, if used
    • payment for the tax owed

Send to:
City of Seattle: Amended Returns
700 Fifth Avenue
PO Box 34214
Seattle, WA 98124-4214