Free IFTA Tax Calculator
Calculate your quarterly IFTA fuel tax for all 48 states. Enter your miles and gallons, get instant tax liability with a plain-English breakdown. Download PDF or CSV.
No signup. No account. 100% free. Supports diesel, gasoline, gasohol, and propane. Updated with Q3 2026 rates.
Key Takeaways
- Fleet MPG is your total quarterly miles divided by total gallons purchased; typical diesel trucks run 4 to 8 MPG.
- Enter miles driven and tax-paid gallons for every state you traveled through; the calculator shows tax due or credit per state in real time.
- Buying more fuel in a state than you consumed there produces a credit (negative tax due) that lowers your net liability.
- Surcharge jurisdictions (Kentucky (10.5¢/gal on diesel), Virginia (14.3¢/gal on diesel)) charge on total taxable gallons, so surcharges are always owed and never generate credits.
- Do not include reefer fuel (gallons or miles) on your IFTA return; only report fuel that powers the truck itself.
- IFTA returns are due quarterly (Apr 30, Jul 31, Oct 31, Jan 31); late filing costs $50 or 10% of tax liability, whichever is greater, plus monthly interest.
O TruckingFree IFTA Tax Calculator 2026
How to Use This IFTA Calculator
Enter Carrier Info
Enter your carrier name, select the quarter, choose your fuel type (diesel is default), and select your base state. The filing deadline shows automatically.
Enter Gallons Purchased
Enter total gallons of fuel purchased during the quarter. Do NOT include reefer fuel. Total miles are auto-calculated from your state entries.
Add States & Miles
Add each state you traveled through. Enter miles driven and tax-paid gallons. Most truckers don't need exempt miles — that toggle is hidden by default.
Review & Download
Review the tax summary with a plain-English breakdown of why you owe or get credit in each state. Download a PDF or CSV report for filing.
Current IFTA Tax Rates by State (Q3 2026)
Diesel and gasoline fuel tax rates for all 48 IFTA member jurisdictions, effective January–March 2026.
Q3 2026 IFTA Tax Rates by State
Diesel rates as published for Q3 2026 (July–September 2026), read from the IFTA Inc. quarterly tax-rate matrix on 2026-08-23. Oregon uses weight-mile tax instead of fuel tax. Surcharge states are highlighted.
n/a means the IFTA matrix publishes no rate for that fuel in that jurisdiction — it does not mean the rate is zero. Get the figure from your base jurisdiction before filing that line.
Verify before you file. IFTA rates are reset every quarter. This table reflects the Q3 2026 rates and may not match the quarter you are filing for. Always confirm the current rates with your base jurisdiction or the official IFTA, Inc. tax rate matrix before submitting a return. IFTA Inc. marks the Q3 2026 matrix provisional until 2026-09-04 — jurisdictions can still amend a rate up to that date.
| State | Code | Diesel ($/gal) | Gasoline ($/gal) | Surcharge ($/gal) | Notes |
|---|---|---|---|---|---|
| Alabama | AL | $0.3100 | $0.3000 | -- | -- |
| Arizona | AZ | $0.2600 | $0.1800 | -- | -- |
| Arkansas | AR | $0.2850 | $0.2470 | -- | -- |
| California | CA | $0.9790 | n/a | -- | -- |
| Colorado | CO | $0.3350 | $0.2800 | -- | -- |
| Connecticut | CT | $0.4990 | $0.2500 | -- | -- |
| Delaware | DE | $0.2200 | $0.2300 | -- | -- |
| Florida | FL | $0.4097 | $0.4110 | -- | -- |
| Georgia | GA | $0.3730 | $0.3330 | -- | -- |
| Idaho | ID | $0.3200 | n/a | -- | -- |
| Illinois | IL | $0.7380 | $0.6530 | -- | -- |
| Indiana | IN | $0.6300 | $0.3700 | -- | Indiana's Motor Carrier Fuel Tax surcharge is folded into the base rate for diesel and gasoline, so there is no separate surcharge line to file. Indiana DOR gives $0.6300/gal special fuel and $0.3700/gal gasoline effective 1 Jul 2026, matching the rates here. Indiana also published a split Q3 2026 rate: a second set takes effect 09/06/26 (gasoline and gasohol are blank in the base Q3 row but $0.3700 in the dated row and in all of Q1 and Q2 2026, which is the figure used). Verify against the IFTA matrix before filing. |
| Iowa | IA | $0.3250 | $0.3000 | -- | -- |
| Kansas | KS | $0.2600 | $0.2400 | -- | -- |
| Kentucky | KY | $0.2200 | $0.2500 | $0.1050 | Kentucky also imposes a KYU weight-distance tax on trucks over 59,999 lbs. That is filed separately from IFTA. |
| Louisiana | LA | $0.2000 | $0.2000 | -- | -- |
| Maine | ME | $0.3120 | n/a | -- | -- |
| Maryland | MD | $0.4675 | $0.4600 | -- | -- |
| Massachusetts | MA | $0.2400 | $0.2400 | -- | -- |
| Michigan | MI | $0.5240 | $0.5240 | -- | -- |
| Minnesota | MN | $0.3260 | $0.3260 | -- | -- |
| Mississippi | MS | $0.2400 | $0.2400 | -- | -- |
| Missouri | MO | $0.2950 | $0.2950 | -- | -- |
| Montana | MT | $0.2975 | n/a | -- | -- |
| Nebraska | NE | $0.3180 | $0.3180 | -- | -- |
| Nevada | NV | $0.2700 | $0.2300 | -- | -- |
| New Hampshire | NH | $0.2220 | n/a | -- | -- |
| New Jersey | NJ | $0.5610 | $0.4910 | -- | -- |
| New Mexico | NM | $0.2100 | $0.1200 | -- | New Mexico also imposes a Weight Distance Tax on vehicles over 26,000 lbs. That is filed separately from IFTA — it is not part of this calculation. |
| New York | NY | $0.3805 | $0.3970 | -- | New York also requires the Highway Use Tax (HUT) for trucks over 18,000 lbs. That is filed separately from IFTA. |
| North Carolina | NC | $0.4100 | $0.4100 | -- | -- |
| North Dakota | ND | $0.2300 | $0.2300 | -- | -- |
| Ohio | OH | $0.4700 | $0.3850 | -- | -- |
| Oklahoma | OK | $0.1900 | $0.1900 | -- | -- |
| Oregon | OR | n/a | n/a | -- | Oregon uses a weight-mile tax instead of a fuel tax. Report Oregon miles for IFTA, but IFTA fuel tax due is $0.00 — file the weight-mile report separately with Oregon DOT. |
| Pennsylvania | PA | $0.7410 | $0.5760 | -- | -- |
| Rhode Island | RI | $0.4000 | $0.4000 | -- | -- |
| South Carolina | SC | $0.2800 | $0.2800 | -- | -- |
| South Dakota | SD | $0.2800 | $0.2800 | -- | -- |
| Tennessee | TN | $0.2700 | $0.2600 | -- | -- |
| Texas | TX | $0.2000 | $0.2000 | -- | -- |
| Utah | UT | $0.3790 | $0.3190 | -- | -- |
| Vermont | VT | $0.3100 | n/a | -- | -- |
| Virginia | VA | $0.3360 | $0.3260 | $0.1430 | Virginia assesses a surcharge on gallons consumed, in addition to the fuel tax. |
| Washington | WA | $0.5950 | $0.5650 | -- | -- |
| West Virginia | WV | $0.3570 | $0.3570 | -- | -- |
| Wisconsin | WI | $0.3290 | $0.3290 | -- | -- |
| Wyoming | WY | $0.2400 | $0.2400 | -- | -- |
How IFTA Tax is Calculated
IFTA (International Fuel Tax Agreement) simplifies fuel tax reporting for carriers operating in multiple states. Instead of filing in each state separately, you file a single quarterly return with your base state.
The Formulas
Step 1
Fleet MPG = Total Miles Driven ÷ Total Gallons Purchased
Step 2
Taxable Gallons [per state] = Taxable Miles ÷ Fleet MPG
Step 3
Net Taxable Gallons = Taxable Gallons − Tax-Paid Gallons
Step 4
Tax Due = Net Taxable Gallons × State Tax Rate
Surcharges
Surcharge = Taxable Gallons × Surcharge Rate (always owed, never generates credits)
Total
Total IFTA Tax = Sum of all states' Tax Due + Surcharges
If you purchased more fuel than you consumed in a state, that state shows a credit (negative tax due). This offsets taxes owed in other states. The net result is either a payment or a refund.
Important: Surcharges vs. Tax Credits
IFTA surcharges (KY, VA) are calculated on total taxable gallons, not net taxable gallons. This means surcharges are always owed regardless of how much fuel you purchased in that state.
IFTA Filing Deadlines
| Quarter | Filing Deadline |
|---|---|
| Q1 (Jan–Mar) | April 30 |
| Q2 (Apr–Jun) | July 31 |
| Q3 (Jul–Sep) | October 31 |
| Q4 (Oct–Dec) | January 31 |
Late filing incurs a $50 penalty or 10% of net tax liability (whichever is greater), plus monthly interest.
States With IFTA Surcharges & Special Taxes
Indiana
Indiana's Motor Carrier Fuel Tax surcharge is already inside the base rate for diesel and gasoline, so there is no separate surcharge line to file — the $0.6300 diesel figure is the whole tax. Adding a surcharge on top would roughly double it. A surcharge row still exists for alternative fuel only, at 63.0¢ per gallon.
Kentucky
Assesses a surcharge on gallons consumed, on top of the base fuel tax — 10.5¢ per gallon on diesel for Q3 2026. KY also imposes a KYU weight-distance tax on trucks over 59,999 lbs — filed separately.
Virginia
Assesses a surcharge on gallons consumed — 14.3¢ per gallon on diesel for Q3 2026 — making its effective diesel rate higher than the headline figure suggests.
Oregon
Uses a weight-mile tax system instead of a per-gallon fuel tax. Report miles in Oregon on your IFTA return, but the fuel tax rate is $0.00. Weight-mile tax is filed separately with Oregon DOT.
New York
Often listed as a surcharge state, but the IFTA matrix shows no separate surcharge row for New York — the petroleum business tax is already inside the base rate, so nothing is added on top. NY does require the Highway Use Tax (HUT) for trucks over 18,000 lbs, which is filed separately from IFTA.
New Mexico
May apply a weight distance tax separately from IFTA. Carriers over 26,000 lbs should check NM weight distance requirements.
IFTA Calculator FAQ
What is IFTA?▼
How is IFTA tax calculated?▼
When are IFTA returns due?▼
What trucks need IFTA stickers?▼
Does Oregon have an IFTA fuel tax?▼
What states have IFTA surcharges?▼
What is Fleet MPG and why does it matter?▼
Can I get an IFTA refund?▼
Should I include reefer fuel on my IFTA return?▼
What is the difference between taxable miles and exempt miles?▼
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