How IFTA works in Illinois

Illinois is an IFTA member jurisdiction. Qualified carriers include Illinois miles and fuel on quarterly returns filed through their base jurisdiction—often the Illinois Department of Revenue if Illinois is your base.

Chicago corridor mileage

Chicago metro routes accumulate Illinois miles quickly. Log full trip routes—including stops and diversions—so Illinois totals match trip detail. Estimating Illinois miles at quarter-end is a common source of audit adjustments.

Illinois records to keep

  • Trip routes through Illinois on I-80, I-90, I-55, and I-57
  • Illinois mileage totals per quarter
  • Fuel receipts for Illinois purchases

How IFTAfy helps with Illinois miles

IFTAfy calculates Illinois miles from trip routes with stops, stores fuel receipts, and generates quarterly reports for review before filing.

Important note

This guide is educational, not tax or legal advice. Confirm current Illinois DOR IFTA requirements before filing.