IFTA Late Penalty Calculator
Late return? Greater of $50 or 10% of tax due, plus monthly interest on unpaid tax. Estimate it, then file — penalties only grow.
PENALTY + INTEREST (ON TOP OF TAX)
$—
Late penalty (max $50 / 10%)—
Interest on unpaid tax—
Total to pay (tax + extras)—
Worked example: $256 tax, 2 months late
10% of $256 is $25.60, so the $50 minimum applies. Interest at 8% annual: $256 × 8% ÷ 12 × 2 = $3.41. Extras total $53.41 on top of the $256 tax — pay $309.41.
Penalty questions
What is the penalty for filing IFTA late?
Typically the greater of $50 or 10% of net tax due, plus monthly interest on unpaid tax. File even for zero miles — the $50 minimum still applies when late.
Does interest stop when I file?
Interest runs on unpaid TAX until it is paid, not just until the return is filed. Filing on time with payment avoids both charges.
What are the IFTA due dates?
Q1 Apr 30, Q2 Jul 31, Q3 Oct 31, Q4 Jan 31 with your base state. Confirm the current interest rate with your base-state portal before paying.