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Filing IFTA tax returns

Our Customer Service Counter has moved. The counter is located at 405 Black Lake Blvd, Olympia, WA 98502. Map and driving directions (

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Save a trip! Most services are available through TAP - PRFT Taxpayer Access Point.

California has a split tax rate for the 4th quarter 2017. The 1st rate of $0.3700 is effective 10/1/2017 through 10/31/2017. The 2nd rate of $0.5700 is effective 11/1/2017 through 12/31/2017. Please list California twice on your tax return for the 4th quarter. Here is a link to the California split rate example.

As an IFTA member, you must complete and file an IFTA tax return every 3 months. You must file:

  • when you don't have any mileage to report (mark "No operation" on the tax return),
  • when you travel only in Washington,
  • even if there is no payment due.

We'll mail a printed tax return and current tax rate schedule quarterly to all active account holders.

How to file a return

File online via TAP or complete an International Fuel Tax Agreement Tax Return form. Instructions for filling out the tax return can be found on the TAP page, our IFTA Tax Return instructions, or review the IFTA Membership packet. Tax Returns must be submitted per the chart below:

Filing quarters and due dates

Tax return quarter Due dates for filing*
1st quarter: January, February, March April 30
2nd quarter: April, May, June July 31
3rd quarter: July, August, September October 31
4th quarter: October, November, December January 31
*Tax returns must be postmarked the next working day if any of the dates fall on a weekend or Washington State holiday.

Mail or Fax:

Tax return with payment enclosed:

Department of Licensing
PRFT, Motor Carrier Services
PO Box 3777
Seattle, WA 98124-3777

Tax return only and no payments:

Department of Licensing
PRFT, Motor Carrier Services
PO Box 9228
Olympia, WA 98507-9228
Fax: 360.570.7839 or 360.370.7829


Cancellation, revocation, and reinstatement

You may cancel your IFTA account at any time via:

  • your TAP account,
  • by submitting a tax return marked "cancel license", or
  • by providing a cancellation letter.

All accounts must be paid in full. If your account is revoked, you would have received a letter regarding this action and providing requirements. When reinstating, use the "reinstatement" link on your TAP account or fill out a new IFTA application. All outstanding amounts must be paid in full and a $100 reinstatement fee must be paid. A new Decal application may need to be completed if you don't have current decals.

If the account is managed by a Service Bureau and the IFTA member wants to remove the access of the Service Bureau, a request must be submitted in writing and sent by email or mail, TAP, the POA, etc. Our staff will make the change and your account on TAP will reflect this or we will call you.

Interest charged on late returns

Interest is set annually by IFTA, Inc. at 2 percentage points above the underpayment rate established by the IRS. This rate accrues monthly at 1/12 the annual rate.

Washington charges 1% interest on the full amount owed as of the 1st of the following month if the balance due has not been paid.

Sample breakdown of interest rates

  • Annual rate: 6% (4% IRS rate + 2% IFTA rate)
  • Monthly rate: .0050% (1/12 of 6% annual rate)


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

  • $100 fuel tax owed x .0050% interest for 1 month the return was late = .50 cents interest; total due is $100.50

If you owe $100 of fuel taxes and submit your IFTA tax return 2 months late:

  • $100 fuel tax owed x .0050% interest for 1 month the return was late = .50 cents interest + another .50 cents; total due is $101.00

How to request copies of your return

For copies of your IFTA tax returns access your TAP account or:

  1. Use the Washington State IFTA Information Release Request.
  2. Send documents:

Related information

Questions? Need help?

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Access Washington – official state government website