Missing an IFTA deadline can lead to penalties and interest. Here's a clear breakdown of reporting periods, due dates, and what to expect if you file late.
IFTA Reporting Periods Explained
IFTA returns are due quarterly, covering:
| Report Period | Period Covered | Due Date |
| 1st Quarter | January 1 – March 31 | April 30 |
| 2nd Quarter | April 1 – June 30 | July 31 |
| 3rd Quarter | July 1 – September 30 | October 31 |
| 4th Quarter | October 1 – December 31 | January 31 |
You file a single return with your base jurisdiction for each quarter.
IFTA Due Dates by Quarter (2026)
In general, IFTA returns are due on the last day of the month following the end of the quarter. For 2026:
- Q1 2026: Due April 30, 2026
- Q2 2026: Due July 31, 2026
- Q3 2026: Due October 31, 2026
- Q4 2026: Due January 31, 2027
Always verify deadlines with your base jurisdiction, especially if the date falls on a weekend or holiday, which may shift the due date.
What Happens If You File Late?
If you miss a due date, most jurisdictions assess a flat penalty or a percentage of the tax due (whichever is greater), plus interest on outstanding balances. For example, California notes a penalty of $50 or 10% of the tax due, whichever is greater, can be applied for late IFTA returns. Consistently late filings can become expensive quickly.
How to Never Miss a Deadline Again
To stay ahead of IFTA deadlines, put quarter-end and due dates on your calendar, set internal deadlines for data collection and review, and use software like iFuelTax to automate calculations and report generation. With a solid process, quarter-end becomes just another checklist—not a fire drill.
Helpful Tools and Next Steps
If you're preparing your next return, use the IFTA Mileage & Tax Calculator to estimate your bill, and review the IFTA Audit Survival Guide to avoid common pitfalls. The more prepared you are ahead of time, the easier each due date becomes.