IFTA (International Fuel Tax Agreement) is a cooperative agreement between the 48 contiguous US states and 10 Canadian provinces that simplifies fuel tax reporting for commercial motor carriers. Before IFTA, truckers had to buy fuel permits in every state they entered and file separate tax returns with each state.
Under IFTA, you get one license from your base state and file one quarterly return covering all jurisdictions. Your base state collects the tax and distributes it to the appropriate states based on where you drove.
You need an IFTA license if your commercial motor vehicle meets ALL of these conditions:
- Used for commercial (business) purposes
- Operates in two or more IFTA member jurisdictions (states/provinces)
- Meets any ONE of: gross vehicle weight over 26,000 lbs, three or more axles on the power unit, or is a bus with a seating capacity of 20 or more passengers
Personal vehicles, recreational vehicles, and vehicles operating only in one state are exempt.
All 48 contiguous US states are IFTA members. Alaska, Hawaii, and the District of Columbia are NOT members. The 10 Canadian provinces are: Alberta, British Columbia, Manitoba, New Brunswick, Newfoundland and Labrador, Nova Scotia, Ontario, Prince Edward Island, Quebec, and Saskatchewan. The three Canadian territories (Yukon, Northwest Territories, Nunavut) are not IFTA members.
Apply for your IFTA license through your base state's motor carrier licensing agency — typically the Department of Motor Vehicles (DMV) or Department of Transportation. You'll need to provide your business address, vehicle information, and pay a small application fee. Your base state is the US state or Canadian province where your business is physically located.
Once approved, you receive an IFTA license and two decals per qualifying vehicle. Decals must be displayed on the driver's and passenger's sides of the cab. Decals are valid for one year (January–December) and must be renewed annually.
IFTA stands for International Fuel Tax Agreement. "International" refers to the cross-border nature of the agreement covering both US and Canadian jurisdictions. The agreement is administered by IFTA, Inc. — a nonprofit organization based in Mesa, Arizona.
Yes — if your vehicle meets the weight/axle requirements and you regularly operate in two or more IFTA states for commercial purposes, you are required to have an IFTA license regardless of how many states you operate in. There is no minimum number of states above two.
Your IFTA base state is the US state or Canadian province where your commercial trucking business has its principal place of business — a physical address where your business records are maintained and where your vehicles are registered. You must be a resident of your base state or have a physical presence there. You can only have one base state at a time.
The following vehicles do not require IFTA:
- Vehicles used solely for personal, non-commercial purposes (including personal RVs and campers)
- Vehicles that only operate within one IFTA jurisdiction
- Government-owned vehicles (depending on jurisdiction)
- Recreational vehicles when used for personal pleasure
- Vehicles that don't meet the weight or axle thresholds
IFTA uses a standardized 4-step formula:
- Step 1 — Fleet MPG: Total miles ÷ total gallons = your fleet's average fuel efficiency
- Step 2 — Gallons consumed per state: State miles ÷ fleet MPG = how many gallons IFTA considers you used in that state
- Step 3 — Net taxable gallons: Gallons consumed − gallons purchased in that state
- Step 4 — Tax due/credit: Net taxable gallons × state tax rate
If you consumed more than you purchased in a state, you owe that state. If you purchased more than you consumed, that state owes you a credit. Credits offset taxes owed to other states.
Credits occur when you purchased more fuel in a state than you theoretically "consumed" there based on your fleet MPG and miles driven. Since you already paid fuel tax at the pump when you bought that fuel, you overpaid tax for that state. IFTA refunds that overpayment as a credit that offsets taxes you owe to other states where you drove more than you fueled.
Example: You drive 600 miles in Texas at fleet MPG of 8 = 75 gallons consumed. But you bought 120 gallons in Texas. You get credit for 45 gallons × $0.20 = $9.00 credit from Texas.
IFTA quarterly deadlines for 2026:
- Q1 (January–March): April 30, 2026
- Q2 (April–June): July 31, 2026
- Q3 (July–September): October 31, 2026
- Q4 (October–December): January 31, 2027
If the deadline falls on a weekend or holiday, it's typically extended to the next business day. Always check with your base state for exact deadline confirmation.
The penalty is the greater of: $50 flat, OR 10% of your net tax liability. Additionally, monthly interest accrues on any unpaid tax balance.
Critically, the $50 minimum applies even if you owe zero tax or have a credit balance. If you didn't drive in multiple states, you must still file a zero-activity return. Missing that zero return still triggers the $50 penalty.
IFTA covers most motor fuels including: diesel (most common for commercial trucks), gasoline, gasohol, liquefied petroleum gas (LPG/propane), liquid natural gas (LNG), compressed natural gas (CNG), ethanol, methanol, and E-85. Each fuel type has separate tax rates per jurisdiction. Our calculator currently supports diesel and gasoline — the most common fuel types for IFTA carriers.
Yes. If you hold an active IFTA license, you must file a return every quarter — even if you drove zero miles in multiple states or didn't drive at all. This is called a "zero activity" return. Failure to file it triggers the minimum $50 penalty. If you know you won't be operating for an extended period, you can apply to cancel your IFTA license and avoid the quarterly filing requirement.
Yes — most base states offer online IFTA filing through their motor carrier portal or DOT website. The process typically requires creating an account with your base state's licensing agency, entering your quarterly trip data (miles per state and gallons purchased per state), and submitting payment if tax is owed. Check your specific base state's DMV or DOT website for instructions. Our calculator helps you prepare the numbers before you file.
This calculator uses the exact official 4-step IFTA calculation methodology from the IFTA Articles of Agreement, with Q1 2026 rates sourced directly from the IFTA, Inc. tax rate matrix. The calculation logic is highly accurate for standard diesel and gasoline calculations.
However, IFTA tax rates change every quarter, and some states have complex special rules. Always verify current rates at iftach.org and consult your base state's motor carrier office before filing your official IFTA return. This tool is for estimation and planning — not a substitute for your official filing.
Four IFTA jurisdictions impose surcharges: Kentucky (2.0¢/gal), Virginia (6.5¢/gal), New York (0.95¢/gal), and New Mexico (1.0¢/gal). These surcharges are charged in addition to the base IFTA fuel tax rate.
This is a critical distinction. Regular IFTA fuel tax is calculated on net taxable gallons (consumed minus purchased). Surcharges are calculated on total taxable gallons consumed — not net taxable gallons. This means:
- Surcharges are always owed in those states regardless of how much fuel you purchased there
- Surcharges never generate credits, even if you bought excess fuel in a surcharge state
- A surcharge state like Virginia will always owe you the surcharge even if your net fuel tax for Virginia is a credit
Oregon is unique among IFTA jurisdictions. Oregon uses a weight-mile tax system instead of per-gallon fuel tax. For IFTA purposes, Oregon's diesel tax rate is $0.00 — you report Oregon miles on your IFTA return but owe no fuel tax to Oregon through IFTA.
Oregon's weight-mile tax must be filed separately through the Oregon Department of Transportation's Weight-Mile Tax program. The rate depends on your vehicle weight and the route type.
Kentucky requires commercial trucks over 59,999 lbs gross weight to also pay the Kentucky Weight Distance Tax (KYU tax) in addition to IFTA. The KYU tax is based on miles driven in Kentucky and is filed separately from your IFTA return — directly with the Kentucky Transportation Cabinet. The KYU rate is approximately 0.0285 cents per mile for most vehicles. This is separate from Kentucky's 2.0¢/gal IFTA surcharge.
Yes. In addition to IFTA (which includes NY's 0.95¢/gal surcharge), New York requires trucks over 18,000 lbs to file a Highway Use Tax (HUT) return. The HUT is based on miles driven in New York and is filed separately with the New York State Department of Taxation and Finance. New Mexico similarly requires a Weight Distance Tax for trucks over 26,000 lbs, filed separately with the New Mexico Taxation and Revenue Department.
You must keep records supporting every quarterly IFTA return for a minimum of 4 years. Required records include:
- Fuel receipts — every purchase showing date, location (city and state), gallons purchased, fuel price, and vehicle unit number or VIN
- Mileage records — miles driven per state per trip (GPS logs, trip sheets, or odometer readings at state borders)
- Trip reports — origin, destination, route, and date
- Copies of all filed IFTA returns
IFTA auditors can review your records for any return filed within the past 4 years (from the filing date or due date, whichever is later). This means a return filed in April 2026 for Q1 2026 could potentially be audited until April 2030. Keep all supporting records — fuel receipts, mileage logs, trip sheets — for the full 4-year window.
IFTA audits are conducted by your base state. The auditor will request your fuel receipts and mileage records for one or more quarters and verify that they match the numbers on your filed returns. If you can't provide adequate documentation, the auditor may use estimation methods that often result in a higher tax assessment.
Common audit triggers include: unusually high or low MPG, large credits on every return, frequent amendments, or random selection. The best protection is clean, organized records stored digitally and in paper form.
You can file an amended IFTA return with your base state to correct errors. The process varies by state — most allow online amendments through the same portal you used to file. If the amendment results in additional tax owed, you'll also need to pay any additional tax plus interest from the original due date. If you're owed a refund due to the amendment, your base state will process it. File amendments promptly — don't wait until an audit forces the correction.
Yes — all 10 Canadian IFTA provinces are included in the calculator. However, note that Canadian provincial fuel tax rates are denominated in Canadian dollars per liter. For accurate US-based IFTA filing involving Canadian provinces, you'll need to convert Canadian currency and kilometers to miles. Additionally, Canadian provinces are not included if you have a Canadian base province — in that case, file with your provincial motor vehicle authority. Consult a tax professional for cross-border filings.
If you're a US-based carrier filing with a US base state, Canadian kilometers must be converted to miles for your IFTA return (1 km = 0.62137 miles). Canadian fuel purchases in liters must be converted to gallons (1 liter = 0.2642 gallons). The same IFTA 4-step calculation formula applies to Canadian provinces — just with converted units. Our calculator accepts miles and gallons so convert before entering.
The 10 IFTA member provinces are: Alberta, British Columbia, Manitoba, New Brunswick, Newfoundland and Labrador, Nova Scotia, Ontario, Prince Edward Island, Quebec, and Saskatchewan. The three northern territories (Yukon, Northwest Territories, and Nunavut) are NOT IFTA members — miles there are reported as non-IFTA miles.