IFTA tax returns

How to file a return

You must submit your return even if payment is not due.

Complete an International Fuel Tax Agreement Tax Return form. Sign and date it.

  • If you’re including a payment mail to:
    Prorate and Fuel Tax
    Department of Licensing
    PO Box 3777
    Seattle, WA 98124-3777
  • If you’re not including a payment mail to:
    Fuel Tax Section
    Department of Licensing
    PO Box 9228
    Olympia, WA 98507-9228
    Fax: 360.570.7839 or 360.586.9729

For more help filling out the form, see IFTA Tax Return Information and Instructions.

Interest charged on late returns

The late return interest is set annually at 2 percentage points above the underpayment rate established by the IRS. This rate accrues monthly at 1/12 the annual rate.

Current interest rates

  • Annual rate: 5% (3% IRS rate + 2% IFTA rate)
  • Monthly rate: .00417% (1/12 of 5% annual rate)

If you owe $100 of fuel taxes and submit your IFTA tax return 1 month late:

  1. $100 fuel tax owed x .00417% interest for 1 month the return was late = .42 cents interest
  2. $100 fuel tax owed + .42 interest for 1 month = $100.42 total due

How to request copies of your return

To get copies of your IFTA tax returns:

  1. Use the Washington State IFTA Information Release Request.
    • Service bureaus: Attach a copy of the Power of Attorney signed by your client.
  2. Send documents:
  3. We’ll send the information within 5 business days.

If you want to get the tax rate schedule for all states

We’ll process your request within 5 business days.

Related information

Questions? Need help?

Email: PRFTQuestions@dol.wa.gov

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