International Fuel Tax Agreement (IFTA) & California Interstate User Diesel Fuel Tax (DI) License Filing Due Dates

International Fuel Tax Agreement (IFTA) and Interstate User Diesel Fuel Tax (DI) returns are filed on a quarterly reporting basis. 

All IFTA eFiled returns must be filed and any amounts due must be paid by 12:00 a.m. (midnight) on the due date to be considered timely.  Confirmation is received immediately upon filing your return. Please keep the confirmation of filing for your records.

Carriers filing paper returns, and payments made with a voucher must be postmarked on or before the due date of the return.

If the due date falls on a weekend or state holiday, the due date is extended to the next business day.

Quarterly Reporting Basis

Reporting Period
Due Date
January - March
April 30
April - June
July 31
July - September
October 31
October - December
January 31