Idaho IFTA Reporting: Step 6

The information in this section applies only to Idaho IFTA licensees, unless otherwise noted.

IFTA Carriers Read our instructions on how to calculate miles per gallon on your IFTA returns during the fuel tax holidays for Maryland, Georgia, and Connecticut.

Net taxable gallons (Column 11)

Subtract the tax-paid gallons in column 10 from the taxable gallons in column 9. Enter the result in column 11.

Tax due/refund (Column 12)

Multiply the amount in column 11 by the tax rate in in column 6. Round to two decimal places. Enter the total in column 12.

Interest due (Column 13)

If reporting late, multiply the interest rate by the tax due. Enter the amount in column 13.

The IFTA interest rates are:

01/01/2025 – 12/31/2026 — 0.007500 per month
01/01/2024 – 12/31/2024 — 0.008333 per month
01/01/2023 – 12/31/2023 — 0.006667 per month
01/01/2021 – 12/31/2022 — 0.004167 per month
01/01/2019 – 12/31/2020 — 0.005833 per month

Example You owe $100 for a jurisdiction on a 2021 first-quarter report due April 30. Your report is 62 days late. You'd calculate interest as $100 x 0.004167 x 3 (months late) = $1.25.

Interest

Interest applies when you owe tax for a jurisdiction and pay late. Calculate interest only for the jurisdictions where you owe tax. For purposes of calculating interest, a report is one month late, even if you submitted it only a day late. You can’t apply a credit from another jurisdiction to a jurisdiction where you owe tax if you’re reporting or paying late.

Note: You have 30 days from the end of the reporting period to file your report and pay any tax due. File as soon as you can! When you use your TAP account, you can file your report early in the month and schedule a payment on the due date from your checking or savings account.

Total due/refund (Column 14)

Add columns 12 and 13. Enter the total in column 14.