Quick Answer: To file IFTA fuel tax for the current quarter, you gather your total miles driven in each jurisdiction and total fuel purchased in each jurisdiction, calculate your fleet’s average miles per gallon, determine taxable gallons per jurisdiction, apply that jurisdiction’s current quarterly tax rate, calculate net tax owed or credit per jurisdiction, and submit the return to your base jurisdiction by the last day of the month following quarter end. IFTA returns are due April 30, July 31, October 31, and January 31. Filing manually takes 4 to 8 hours per quarter. Filing with automated software takes under 30 minutes.
In this guide you’ll learn:
- Who has to file IFTA and what records you need
- The 7-step IFTA filing process with a fully worked example
- The 2026 IFTA filing deadlines by quarter
- What triggers penalties and how much they cost
- How automation cuts filing time from hours to minutes
What Is IFTA and Why It Exists
The International Fuel Tax Agreement (IFTA) is a fuel tax cooperative between the 48 contiguous US states and 10 Canadian provinces. Instead of filing separate fuel tax returns in every state or province you operate in, IFTA lets you file one consolidated quarterly return with your base jurisdiction, and that jurisdiction distributes the tax owed to each state or province based on where you actually consumed fuel.
Without IFTA, a driver going from Texas to California would need separate fuel permits and separate tax filings for every state crossed. IFTA collapses that into a single return, filed four times a year.
Who Has to File IFTA
IFTA applies to qualified motor vehicles used for business that travel in two or more IFTA member jurisdictions. Your vehicle is a qualified motor vehicle if any of these apply:
- Two axles and a gross vehicle weight or registered gross vehicle weight over 26,000 pounds
- Three or more axles, regardless of weight
- Used in a combination when the combined weight exceeds 26,000 pounds
If your operation matches that profile and you cross state or provincial lines, you file an IFTA return every quarter, even in quarters when you drove zero miles outside your base jurisdiction. Zero-mile quarters still require a filing.
What You Need Before You File
Before you sit down to file, gather these records for the quarter:
- Mileage by jurisdiction. Total miles driven in each US state and Canadian province where you operated. GPS or ELD-derived mileage is the gold standard. Handwritten trip logs work but invite audits.
- Fuel purchase records. Every fuel purchase during the quarter, showing date, location, gallons, and price per gallon. Credit card statements alone are not enough. You need the actual receipt showing gallons and location.
- Vehicle records. Truck ID, driver, and the miles that vehicle contributed to each jurisdiction.
- Your base jurisdiction’s filing credentials. Portal login, IFTA license number, and any state-specific access details.
The retention rule for these records is four years from the return due date. Both electronic and paper records are acceptable, as long as they can be produced in a readable format if an auditor asks.
The 7-Step IFTA Filing Process
Here is the manual process, step by step, using a real-numbers example.
Step 1: Gather Your Mileage Records for the Quarter
Pull the total miles each qualified vehicle traveled in every IFTA jurisdiction during the quarter. If you have an ELD or GPS system, export the state-by-state breakdown. If you have paper logs, tally them by state.
Example. A single-truck operator ran the following in Q2 2026:
- Texas: 5,000 miles
- Oklahoma: 4,000 miles
- Missouri: 3,000 miles
- Illinois: 3,000 miles
- Total: 15,000 miles
Step 2: Gather Your Fuel Purchase Records
Total the gallons of fuel purchased in each jurisdiction during the quarter. These are your tax-paid gallons: fuel where you already paid the state’s fuel tax at the pump.
Example. Same operator’s Q2 fuel purchases:
- Texas: 900 gallons
- Oklahoma: 600 gallons
- Missouri: 400 gallons
- Illinois: 400 gallons
- Total: 2,300 gallons
Step 3: Calculate Your Fleet MPG for the Quarter
Divide total miles across all jurisdictions by total gallons purchased during the quarter. Use this quarter’s actual data, not last quarter’s.
Formula: Fleet MPG = Total miles ÷ Total gallons
Example. 15,000 miles ÷ 2,300 gallons = 6.52 MPG
A fleet MPG below 4 or above 10 is a red flag for auditors. Realistic numbers for over-the-road tractors typically fall between 5.5 and 7.5 MPG.
Step 4: Calculate Taxable Gallons per Jurisdiction
For each jurisdiction where you drove, divide the miles you drove there by your fleet MPG. This gives you the taxable gallons: the fuel you theoretically consumed in that jurisdiction, regardless of where you actually bought it.
Formula: Taxable gallons = Miles in jurisdiction ÷ Fleet MPG
Example.
- Texas: 5,000 ÷ 6.52 = 767 taxable gallons
- Oklahoma: 4,000 ÷ 6.52 = 613 taxable gallons
- Missouri: 3,000 ÷ 6.52 = 460 taxable gallons
- Illinois: 3,000 ÷ 6.52 = 460 taxable gallons
Step 5: Apply the Current Quarterly Tax Rate for Each Jurisdiction
Get the current quarter’s tax rate for each jurisdiction from the official IFTA rate matrix, published at iftach.org. Rates change every quarter, so do not use last quarter’s numbers.
For each jurisdiction, calculate the difference between taxable gallons and tax-paid (purchased) gallons, then multiply by that jurisdiction’s rate.
Formula: Net tax = (Taxable gallons − Tax-paid gallons) × Jurisdiction tax rate
- A positive result means you owe tax to that jurisdiction (you consumed more fuel there than you purchased).
- A negative result means that jurisdiction owes you a credit (you purchased more fuel there than you consumed).
Step 6: Calculate Net Tax Owed or Credit
Sum the tax owed and credits across all jurisdictions. The total is what you owe (or the refund you receive) with your quarterly return.
Example using illustrative Q2 2026 rates (verify actual current rates at iftach.org before filing):
| Jurisdiction | Taxable gal | Tax-paid gal | Net gal | Rate | Tax owed |
|---|---|---|---|---|---|
| Texas | 767 | 900 | −133 | $0.20 | −$26.60 (credit) |
| Oklahoma | 613 | 600 | +13 | $0.20 | +$2.60 |
| Missouri | 460 | 400 | +60 | $0.17 | +$10.20 |
| Illinois | 460 | 400 | +60 | $0.46 | +$27.60 |
| Total | +$13.80 |
The operator owes $13.80 to their base jurisdiction, which distributes the amounts owed to Oklahoma, Missouri, and Illinois, and applies the Texas credit against them.
Step 7: File the Return With Your Base Jurisdiction
Submit the completed return to your base jurisdiction by the deadline. Most base jurisdictions offer online filing through a state portal. Some still accept paper returns.
Most portals accept a completed return in one of these ways:
- Manual entry into the state’s filing form
- Upload of a jurisdiction-specific spreadsheet template
- Import from an approved IFTA software provider
Pay any tax owed by the deadline. Most jurisdictions accept ACH debit and credit card payments through the same portal.
2026 IFTA Filing Deadlines
IFTA returns are due on the last day of the month following each quarter’s end. If that day is a weekend or federal holiday, the deadline shifts to the next business day.
The 2026 IFTA deadlines are:
- Q1 (January 1 to March 31, 2026): due April 30, 2026 (Thursday, no shift)
- Q2 (April 1 to June 30, 2026): due July 31, 2026 (Friday, no shift)
- Q3 (July 1 to September 30, 2026): due October 31, 2026 (Saturday, shifted to Monday, November 2, 2026)
- Q4 (October 1 to December 31, 2026): due January 31, 2027 (Monday, no shift)
A return is required for every quarter you hold an active IFTA license, even if you drove zero miles.
The Records You Have to Keep After Filing
IFTA requires carriers to keep supporting records for four years from the return due date. For Q2 2026 (due July 31, 2026), that means keeping records through July 31, 2030.
The records that have to survive that window:
- Distance records showing miles traveled in each jurisdiction, by trip and by vehicle
- Fuel purchase records showing date, location, gallons, and price per gallon
- Trip reports, dispatch records, or GPS logs supporting the mileage
- The filed returns themselves and any correspondence with the base jurisdiction
Electronic records are fully acceptable, and they are far more reliable than paper. Fuel receipts fade, get lost, and get destroyed. A digital record kept for the full four years is what actually survives an audit.
Common Filing Mistakes That Trigger Penalties
Most IFTA problems trace back to a small set of recurring mistakes. Watch for these specifically:
- Missing fuel receipts. Credit card statements alone are not sufficient. You need the receipt showing gallons, price, date, and location. Without it, you cannot claim the tax-paid credit.
- Unrealistic MPG. A quarter reporting 4 MPG or 10 MPG on an over-the-road tractor draws immediate attention. If your MPG looks off, check your mileage or fuel data before filing.
- Missing zero returns. A quarter with no interstate miles still requires a filing. Skipping it triggers penalties and, after two missed quarters, license revocation.
- Trip splits at quarter boundaries. A trip that starts March 30 and ends April 2 has to be split. March 30 and 31 miles go on Q1. April 1 and 2 miles go on Q2.
- Cash fuel purchases without receipts. Drivers stopping at unfamiliar stations often lose receipts. Train drivers to photograph every receipt at the pump.
- Using last quarter’s tax rates. Rates change every quarter. Always verify against the current published IFTA rate matrix at iftach.org.
- Manual math errors. Rounding, transposition, and division mistakes are common. Auditors catch these routinely and require amended filings.
What Happens if You Miss the Deadline
IFTA late-filing penalties vary by base jurisdiction, but the pattern is consistent across most member jurisdictions:
- Late-filing penalty: typically $50 minimum, or 10% of the net tax owed, whichever is greater
- Monthly interest: typically 1% to 1.5% per month on any unpaid tax, accruing from the day after the due date
- License suspension: many base jurisdictions suspend the IFTA license after 30 days past due
- License revocation: most jurisdictions revoke the IFTA license after two consecutive missed filings
Once your IFTA license is revoked, you cannot legally operate qualified vehicles across state lines. Reinstatement requires paying all outstanding returns, penalties, and interest in full. There are no partial payment plans.
Beyond the direct penalties, missed filings raise your audit risk. Carriers with a history of late or amended returns get flagged for review more often than carriers with clean records.
How Automation Changes the Process
Manual IFTA filing takes 4 to 8 hours per quarter for a typical operation: drivers log odometer readings at every state crossing, the back office collects paper receipts, and someone spends a weekend matching everything up before running the calculations.
Automated IFTA reporting collapses that to under 30 minutes, and for many operations to a few minutes. The mechanism is straightforward:
- Mileage flows directly from your ELD into the reporting system, tracked by jurisdiction as trucks run
- Fuel purchases import automatically from your fuel card, tied to the correct jurisdiction
- Current quarterly tax rates apply automatically across all jurisdictions
- The quarterly summary is ready to file the day quarter ends, not the day the return is due
TenTrucks IFTA reporting software handles all of this natively for both the US and Canada. It integrates with major ELD providers (Motive, Samsara, Geotab, BigRoad, and others) and major fuel card providers (Comdata, EFS, Wex, AtoB, Mudflap, RTS Fuel Card, Pilot, Love’s, and more), so the data that generates your IFTA return is the same data already running through your dispatch. Nothing gets typed twice.
For a full comparison of IFTA software options, see the best IFTA software for owner-operators in 2026.
Frequently Asked Questions
When is the IFTA filing deadline in 2026? IFTA returns are due April 30, 2026 (Q1), July 31, 2026 (Q2), October 31, 2026 (Q3, which shifts to Monday November 2 due to the weekend), and January 31, 2027 (Q4). If a deadline falls on a weekend or federal holiday, the deadline moves to the next business day.
How long does it take to file IFTA manually? Manual IFTA filing takes 4 to 8 hours per quarter for a typical single-truck or small-fleet operation, longer for fleets with many trucks or messy records. Automated IFTA reporting reduces the same job to under 30 minutes.
Do I have to file IFTA if I did not operate this quarter? Yes. A zero-mile return is still required for every quarter you hold an active IFTA license. Failing to file, even with no activity, triggers penalties and can lead to license revocation after two consecutive missed quarters.
What happens if I miss the IFTA deadline? You face a late-filing penalty (typically $50 minimum or 10% of tax owed, whichever is greater), monthly interest on any unpaid tax, and potential license suspension after 30 days past due. Missing two consecutive filings triggers license revocation.
How do I calculate IFTA fuel tax? Sum your total miles across all jurisdictions and total gallons purchased. Divide miles by gallons to get your fleet MPG for the quarter. For each jurisdiction, divide the miles driven there by your fleet MPG to get taxable gallons. Subtract tax-paid gallons (fuel purchased in that jurisdiction) from taxable gallons. Multiply by that jurisdiction’s current quarterly tax rate. The result is what you owe (positive) or the credit you get (negative).
Where do I find current IFTA tax rates? Current quarterly IFTA tax rates by jurisdiction are published at iftach.org, the official IFTA website. Rates change every quarter, so always verify against the current published rates, not last quarter’s numbers.
Can I file IFTA online? Yes. Most base jurisdictions offer online filing through a state portal. Some still accept paper returns. Approved IFTA software can also produce a ready-to-file summary that you submit to the base jurisdiction electronically.
How long do I have to keep IFTA records? IFTA requires carriers to keep supporting records (mileage records, fuel purchase records, trip logs, GPS data) for four years from the return due date. Electronic records are fully acceptable and more reliable than paper.
What records count for IFTA fuel purchases? The actual fuel receipt showing date, location, gallons purchased, and price per gallon. Credit card statements alone are not sufficient. Fuel card records that show the same detail do count. Train drivers to photograph every receipt immediately at the pump.
What is a qualified motor vehicle under IFTA? A qualified motor vehicle has two axles and a gross vehicle weight over 26,000 pounds, three or more axles regardless of weight, or is used in a combination when the combined weight exceeds 26,000 pounds.
Do owner-operators have to file IFTA? Yes, if the operation crosses state or provincial lines with a qualified motor vehicle. The same rules apply whether you run one truck or 500. See TenTrucks for owner-operators for how single-truck operations handle IFTA on one platform.
How does automated IFTA software work with my ELD? Automated IFTA software imports mileage data directly from your ELD, so you never manually export or re-key the numbers. TenTrucks integrates with Motive, Samsara, Geotab, BigRoad, and other major ELD providers. See current TenTrucks plans for pricing.
The Bottom Line
Filing IFTA manually is not hard, but it is time-consuming and error-prone. The four costs that catch carriers off guard are the hours of back-office time each quarter, the penalties when a deadline slips, the interest that accrues on unpaid tax, and the audit risk that comes from a history of amended returns. Every one of them is avoidable with clean records and current-quarter rates.
For carriers looking to stop treating IFTA as a quarterly project, automated IFTA reporting is what changes the math. When mileage flows from the ELD and fuel data flows from the fuel card, the quarterly filing becomes a review step instead of a weekend of work.
Start your free trial of TenTrucks and see how automated IFTA reporting fits alongside dispatch, invoicing, and settlements in one platform built for owner-operators and fleets up to 50 trucks. For more on how compliance shifts are hitting fleets this year, see our guide to IFTA reporting and ELD compliance in 2026.
Sources and References
- International Fuel Tax Association (iftach.org) — official quarterly tax rate matrix and filing procedures
- California Department of Tax and Fee Administration — IFTA quarterly tax return filing instructions
- Base jurisdiction filing portals (state-specific)
- IFTA license requirements and penalty schedules published by member jurisdictions
Tax rates and specific state procedures change quarterly. Always verify against your base jurisdiction’s current published filing instructions. This article is informational and is not tax or legal advice.
About TenTrucks
TenTrucks is an AI-powered fleet operations platform for owner-operators and carriers running 1 to 50 trucks. It combines TMS and dispatch, ELD and compliance, automated IFTA reporting, settlements, invoicing, and a mobile driver app in one system.
