All State Offices will be closed January 1, 2026 for New Year's Day.

 
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4Q25 IFTA Newsletter

Physical Address: 1881 Pierce St, Lakewood, CO 80214
Mailing Address: P.O. Box 17087, Room108, Denver, CO 80217-0087

2026 IFTA Filing Information

Filing Period

Quarter Dates

Due Dates

12/31/2025Oct 1 - Dec 31, 2025Feb 2, 2026
3/31/2026Jan 1 - Mar 31, 2026Apr 30, 2026
6/30/2026Apr 1 - Jun 30, 2026July 31, 2026
09/30/2026Jul 1 - Sep 30, 2026Nov 2, 2026
12/31/2026Oct 1 - Dec 31, 2026Feb 1, 2027


Fuel tax rates are updated quarterly. Payments are due on the same date as the return.

Not using IFTA in 2026?

To close your account as of December 31, 2025, return the unused decals and original license to:

  • Colorado Department of Revenue, Fuel Room 463, P.O. Box 17087, Denver, CO 80217-0087.
  • Or drop off unused decals and original licenses at a Department of Revenue service center. For location information, see tax.colorado.gov/visit-a-service-center.

Two ways to Request Decals for New Vehicles Added to your IFTA Fleet:

  1. Carriers who register their vehicle in person through an IRP appointment may request (at that time) to have IFTA decals and licenses issued.
  2. Contact IRP at 303-205-5608 or through MyDMV.Colorado.gov to schedule an appointment to register. After the vehicle is registered, you can send a web message through Revenue Online to request a new set of decals; include a copy of the registration for the new vehicle.

Mandatory Electronic Filing Notice

Due to rule 39-21-119.5-6, taxpayers who submit IFTA Tax Returns are required to start filing returns through Revenue Online according to the following schedule:

Total Miles Traveled during the 
Prior Calendar Year

Filing Period Required to 
Start Using Revenue Online

80,000 or more miles driven in 20253/31/2026
25,000 or more miles driven in 20263/31/2027
All licensees are required to file electronically3/31/2028


The penalty for not filing electronically when required is the greater of $50 or 5% of the tax due. Go to Colorado.gov/RevenueOnline to sign up and file your IFTA return. 

To avoid disruption in your operations, stay informed and meet all the deadlines. For questions, contact the Fuel Unit via RevenueOnline or 303-205-8205, option 1.