Quarterly Deadlines, Audits, and Recordkeeping

Quarterly reporting

IFTA returns are filed four times per year for calendar quarters. Due dates depend on your base jurisdiction; many use the last day of the month following the end of the quarter. Verify the exact calendar for your state or province every year.

Records to keep

Strong records usually include: distance by jurisdiction, fuel purchases (receipts or bulk fuel summaries), vehicle identification, and a clear trail from individual trips to the totals on your return. Gaps in mileage or fuel documentation are a common audit finding.

Audits

Jurisdictions can audit prior periods. When they do, they often reconcile reported miles and fuel to source documents. Using a structured log (like trip legs by state) makes it easier to show how your quarterly numbers were built.

IFTA Mileage does not file taxes for you; it helps you capture and export data you can use with your filing process.