IFTA quarterly filing: deadlines, records and common mistakes

Who has to file

You need an IFTA license if you are based in a member jurisdiction and run a qualified motor vehicle in two or more member jurisdictions (Articles of Agreement R305). There are 58 members: the 48 contiguous states and 10 Canadian provinces (IFTA, Inc., October 2026); the IFTA carrier page lists each one with its contact details.

A qualified motor vehicle is one used, designed or maintained to carry people or property that has any of the following (R245):

• two axles and a gross vehicle weight or registered gross vehicle weight over 26,000 pounds (11,797 kg);
• three or more axles, whatever the weight;
• a combination weighing over 26,000 pounds.

Recreational vehicles don’t count. A two-axle box truck at or under 26,000 pounds that never pulls a trailer usually falls outside IFTA, but a pickup and gooseneck combination over 26,000 pounds is in.

Your base jurisdiction is the state or province where the truck is registered, where you keep or can produce your operational records, and where the truck runs some of its miles (R212). It issues your license and two decals for each qualified vehicle, sends the return forms and audits you on behalf of every other member (IFTA carrier page).

If you only cross a line now and then, you can buy a trip permit from each jurisdiction instead of licensing (R310).

If you are leased on to a carrier

Who files depends on the lease (R530):

• Trip leases of 29 days or less: you, the owner (lessor), report and pay the fuel tax.
• Leases of 30 days or more: the lease can name either party. If it doesn’t say, the carrier (lessee) reports and pays.

Read the fuel tax clause before you sign. Our lease-on vs own authority guide covers what else a lease must spell out.

The quarterly due dates

IFTA quarters follow the calendar: January–March, April–June, July–September and October–December (R254). Each return, and the full payment, is due on the last day of the month after the quarter ends. If that day is a Saturday, Sunday or legal holiday, the next business day is the due date (R960.100).

A state holiday in your base jurisdiction can push a date one more day, so check its calendar too. A few more timing rules:

• Mailed returns count as filed on the postmark date, if the envelope is properly addressed and stamped (R960.200).
• E-filed returns and payments count as received on the date your base jurisdiction’s law sets (R960.300).
• Zero returns are required. You file every quarter, even if you ran no miles or used no taxable fuel (R930.100).
• Annual filing is possible if you ran under 5,000 miles outside your base jurisdiction in 12 months. You have to ask for it and be approved, and the annual return is due January 31 (R930.200, R960.100).
• No form is no excuse. Your base jurisdiction sends returns at least 30 days before the due date, but not receiving one doesn’t excuse a late filing (R940.100).

What goes on a return

One return covers all your qualified vehicles and all member jurisdictions. Paying it to your base jurisdiction settles what you owe everywhere else (R920). The return reports (Procedures Manual P710):

1. your total miles in all jurisdictions, taxable or not;
2. the total fuel used by your qualified vehicles;
3. your miles in each member jurisdiction;
4. the taxable fuel used in each jurisdiction;
5. the tax-paid fuel you bought in each jurisdiction.

Your fleet average (miles per gallon, to two decimals) turns each jurisdiction’s miles into taxable gallons. The tax-paid gallons you bought there come off that. If you fueled up where taxes are low and drove where they are high, you owe the difference. In the opposite case you get a credit.

Records to keep

Keep your IFTA records for four years from the date the return was due or filed, whichever is later (P510). In an audit the burden of proof is on you (P520). Records can be paper or digital, as long as the auditor can work with them (P530).

Distance records

For each trip, a manual trip record should show (P540.100):

• the start and end dates;
• origin, destination and route;
• odometer, hubodometer or ECM readings at the start and end;
• total miles, and the miles in each jurisdiction;
• the VIN or unit number.

GPS or ELD tracking data must log a position at least every 10 minutes while the engine runs, with date and time, latitude and longitude to four decimals, the ECM odometer and the unit number. It must be available as a spreadsheet file (XLS, XLSX, CSV or delimited text). PDFs, images and Word files are not accepted (P540.200).

Fuel receipts

You only get credit for tax-paid fuel if you can produce a receipt, invoice, card statement or digital copy for each purchase (P550.220). Each must show (P550.300):

• the date;
• the seller’s name and address;
• the gallons;
• the fuel type;
• the price per gallon or the total price;
• the truck it went into;
• the purchaser’s name. On leased equipment, the lessor or the lessee is fine.

Altered or illegible receipts are refused (P550.200). Fuel put into a vehicle that isn’t a qualified motor vehicle gets no credit (P550.210).

If your records aren’t adequate, the base jurisdiction can assess you as if your fleet ran 4.00 miles per gallon, or 20% worse than you reported (P570.100). That usually costs far more than the tax itself.

Penalties and interest

• Penalty: your base jurisdiction may charge $50 or 10% of the delinquent tax, whichever is greater. It applies to failing to file, filing late or underpaying (R1220.100), and states can add their own penalties on top (R1220.300).
• Interest: for U.S.-based fleets, interest on late tax is 2 points above the IRS underpayment rate and accrues monthly (R1230.100). For 2026 that is 9% a year (IFTA interest rates).
• Renewal: next year’s license and decals are issued only if all returns are filed and all tax, penalties and interest are paid (R345.100).

Renewing for 2027

IFTA licenses and decals run by calendar year. IFTA, Inc.’s October 1, 2026 memo says 2027 renewals must be filed with your base jurisdiction before the end of 2026. January and February 2027 are only a grace period for putting the new license and decals on the truck, not for filing the renewal (R655.200).

During those two months you can run with valid 2027 credentials, or with valid 2026 credentials if you have applied to renew, or with a trip permit. Carriers using new decals early still owe the fourth-quarter 2026 return (R630).

Fall 2026: dyed diesel and fuel tax holidays

A federal executive order on October 5, 2026 addressed highway use of dyed diesel, and several states have since issued their own orders and fuel tax holidays. IFTA, Inc.’s October 8, 2026 memo makes three points for IFTA filers:

• The federal order doesn’t override state law. Using dyed diesel is only safe from state penalties in a jurisdiction that has issued its own order.
• Permission to use it doesn’t make it tax-free. Most of those states don’t exempt dyed diesel from fuel use tax.
• Report it like any untaxed fuel. Count all its miles and gallons in your totals. Dyed diesel is usually bought tax-free, so you can’t claim it as tax-paid. The memo names limited exceptions, such as Nebraska and Georgia’s tax holiday through November 5, 2026.

IFTA, Inc. posts each jurisdiction’s orders, split rates and tax holiday notices on its Important Notices page. Check it before you file the third- and fourth-quarter 2026 returns.

Common mistakes

• Skipping a quiet quarter. No miles still means a return (R930.100).
• Missing the real due date. The weekend rule only moves a date that falls on a weekend or holiday. Check the table above each quarter.
• Receipts without the truck number or purchaser name. Without them you lose the tax-paid credit for that fuel (P550.300).
• Keeping ELD or GPS data only as PDFs. Auditors need the raw data in spreadsheet form (P540.200).
• Gaps in trip records. Missing odometer readings or state-line miles make the records inadequate, and the 4.00 MPG assessment follows (P570).
• Throwing records out too early. Keep them four years after the due or filing date (P510).
• A lease that is silent on fuel tax. On a long-term lease, silence means the carrier reports. Agree it in writing so nobody files twice or not at all (R530.200).
• Renewing in January. File the renewal before December 31; the grace period only covers display.

IFTA sits alongside the other filings an interstate carrier keeps current: UCR registration each year and the MCS-150 biennial update every two years. Our DOT compliance services and the rest of our trucking services can take them on for you.

Quarterly checklist

Sources

Every rule, date, fee and rate on this page comes from the official sources below. We opened and checked each one on October 9, 2026. Rules change: if a source says something different from this page, the source wins.

1. IFTA Articles of Agreement (effective August 26, 2026), sections R212, R245, R254, R305, R310, R345, R530, R630, R655, R920, R930, R940, R960, R1220 and R1230 (IFTA, Inc.).
2. IFTA Procedures Manual (effective August 26, 2026), sections P510–P570 and P710 (IFTA, Inc.).
3. Carrier Information (IFTA, Inc.).
4. U.S. Annual Interest Rates (IFTA, Inc.).
5. IFTA Credential Grace Period memorandum, October 1, 2026 (IFTA, Inc.).
6. Executive Director memo on the use of dyed diesel, October 8, 2026 (IFTA, Inc.).
7. Important Notices (jurisdiction orders and tax holiday notices) (IFTA, Inc.).

This guide is general information for owner-operators and small fleets, not legal or tax advice. Your base state or province, FMCSA and the official program sites have the final word on your filings.