Do I file a return in every state I drove through?

No. The return is filed with the base jurisdiction only. Timely filing of the tax return and payment of taxes due to the base jurisdiction for all member jurisdictions discharges the licensee's filing responsibility to every member jurisdiction; the base jurisdiction settles up with the others.

What happens if I file IFTA late?

A return not filed, or taxes not paid in full, by the due date is late and the taxes are delinquent. The base jurisdiction may assess a penalty of $50.00 or 10 percent of delinquent taxes, whichever is greater, for failing to file, filing late, or underpaying. (IFTA Articles of Agreement R970, R1220.100.)

How long do I keep IFTA records?

A licensee must retain the records behind its IFTA returns for four years from the date the return was due or was filed, whichever is later, plus any period covered by waivers or jeopardy assessments, and must make them available for audit to any member jurisdiction on request. (IFTA Procedures Manual P510.)

Do I need an IFTA filing service or software?

No. The return is arithmetic on records you are already required to keep: distance by jurisdiction, fuel by jurisdiction, and the current rate matrix. A service can save time once a fleet grows, but nothing in the agreement requires one, and the base jurisdiction accepts the same return either way.

Fuel tax

How to file IFTA yourself

An IFTA return is one filing with your base jurisdiction: distance by jurisdiction, fuel by jurisdiction, the current rates, and the netted result. No service is required to do it. This walkthrough covers the records, the math, and the deadlines, each rule cited to the IFTA Articles of Agreement or Procedures Manual.

By Evan Reid, Founder of Haul Handbook · Updated Jul 22, 2026

The filing, step by step

Before you start, it helps to estimate the quarter first so you know roughly what the return should land on, and to have current rates open in another tab; the matrix changes quarterly.

Pull the quarter’s distance by jurisdiction. Total the miles your qualified vehicles ran in each member jurisdiction during the reporting period, from trip records or your tracking system. Distance records produced by means other than a vehicle-tracking system must substantially document the fleet's operation and contain these elements. The elements list below is the audit standard your records must meet.
Total the fuel purchased in each jurisdiction. Add up tax-paid gallons bought in each jurisdiction from your retail receipts and any bulk-tank withdrawal records. Only purchases documented to the receipt standard below earn tax-paid credit on the return.
Compute the fleet average and each jurisdiction’s taxable gallons. Divide total distance by total gallons to get the fleet average, then divide each jurisdiction’s distance by that average to get the gallons you burned there. The return form does this arithmetic row by row; the quarterly rate matrix supplies each jurisdiction’s rate.
Apply the current rates and net it out. Multiply each jurisdiction’s taxable gallons by its current rate, subtract the tax you already paid at the pump there, and sum the rows. Some rows come out as credits, others as tax due; the return nets them into one figure.
File with your base jurisdiction by the deadline. The return is filed with the base jurisdiction only. Timely filing of the tax return and payment of taxes due to the base jurisdiction for all member jurisdictions discharges the licensee's filing responsibility to every member jurisdiction; the base jurisdiction settles up with the others. File on the base jurisdiction’s own form or portal.
Pay, and keep everything. A licensee must retain the records behind its IFTA returns for four years from the date the return was due or was filed, whichever is later, plus any period covered by waivers or jeopardy assessments, and must make them available for audit to any member jurisdiction on request.

The deadlines

IFTA quarterly tax reporting periods follow the calendar quarters: January 1 through March 31, April 1 through June 30, July 1 through September 30, and October 1 through December 31. The tax return and full payment are due on the last day of the month following the close of the reporting period. If that day falls on a Saturday, Sunday, or legal holiday, the next business day is the due date. Licensees granted annual filing file by January 31 after the close of the annual period.

Reporting quarter	Return and payment due
Q1: January 1 - March 31	April 30
Q2: April 1 - June 30	July 31
Q3: July 1 - September 30	October 31
Q4: October 1 - December 31	January 31

Dates derive from the R254 quarterly periods plus the R960.100 last-day-of-following-month rule; when a due date lands on a weekend or legal holiday it moves to the next business day.

The records that survive an audit

Distance records produced by means other than a vehicle-tracking system must substantially document the fleet's operation and contain these elements:

the beginning and ending dates of the trip
the origin and destination of the trip
the route of travel
the beginning and ending odometer, hubodometer, or ECM reading for the trip
the total distance of the trip
the distance traveled in each jurisdiction during the trip
the vehicle identification number or vehicle unit number

Distance records from a vehicle-tracking system using latitudes and longitudes must be created and kept at a minimum every 10 minutes when the engine is on, and must include the date and time, latitude and longitude to at least 4 decimal places, the ECM odometer reading, and the vehicle or unit number. The data must be accessible in a spreadsheet format such as XLS, XLSX, CSV, or delimited text; static images such as PDF or JPEG are not acceptable. Most ELD platforms export exactly this; confirm yours does before you rely on it. If you are weighing a paid platform for the bookkeeping around these records, the neutral rundown is in trucking software; nothing in the agreement requires one.

The licensee must keep complete records of all motor fuel purchased, received, or used in its business, adequate for an auditor to verify the total fuel placed into qualified motor vehicles by fuel type. Tax-paid credit is disallowed for altered, erased, or illegible records unless proven valid. For tax-paid credit, each receipt, invoice, or transaction listing must show:

the date of the fuel purchase
the name and address of the seller (a properly identified vendor code is acceptable)
the quantity of fuel purchased
the type of fuel purchased
the price per volume or the total price paid
the identification of the qualified motor vehicle the fuel went into
the name of the purchaser

Tax-paid credit for fuel drawn from the licensee's own bulk storage requires delivery receipts, quarterly inventory reconciliations for each tank, tank capacities, and bulk withdrawal records for every tank at each location. Fuel-card statements that carry these fields double as clean IFTA records, one of the quieter reasons to run fuel through a card; see fuel cards for truckers.

Your base jurisdiction's specifics

The agreement sets the deadlines and the record standard; your base jurisdiction sets the form, the portal, and the license and decal details. State-verified specifics for the states this site covers:

Frequently asked questions

When are IFTA returns due?: The tax return and full payment are due on the last day of the month following the close of the reporting period. If that day falls on a Saturday, Sunday, or legal holiday, the next business day is the due date. Licensees granted annual filing file by January 31 after the close of the annual period. (IFTA Articles of Agreement R960.100.)
Do I file a return in every state I drove through?: No. The return is filed with the base jurisdiction only. Timely filing of the tax return and payment of taxes due to the base jurisdiction for all member jurisdictions discharges the licensee's filing responsibility to every member jurisdiction; the base jurisdiction settles up with the others.
What happens if I file IFTA late?: A return not filed, or taxes not paid in full, by the due date is late and the taxes are delinquent. The base jurisdiction may assess a penalty of $50.00 or 10 percent of delinquent taxes, whichever is greater, for failing to file, filing late, or underpaying. (IFTA Articles of Agreement R970, R1220.100.)
How long do I keep IFTA records?: A licensee must retain the records behind its IFTA returns for four years from the date the return was due or was filed, whichever is later, plus any period covered by waivers or jeopardy assessments, and must make them available for audit to any member jurisdiction on request. (IFTA Procedures Manual P510.)
Do I need an IFTA filing service or software?: No. The return is arithmetic on records you are already required to keep: distance by jurisdiction, fuel by jurisdiction, and the current rate matrix. A service can save time once a fleet grows, but nothing in the agreement requires one, and the base jurisdiction accepts the same return either way.

Sources

Primary statutes and official agency pages this guide relies on. Laws and fees change, so confirm against the current source before you act.

IFTA Articles of Agreement, effective January 1, 2026 (R254, R920, R960, R970, R1220) · International Fuel Tax Association, Inc. (IFTA, Inc.)
IFTA Procedures Manual, effective January 1, 2026 (P510, P540, P550) · International Fuel Tax Association, Inc. (IFTA, Inc.)

Haul Handbook publishes educational information about trucking registration and compliance requirements. This is not legal, financial, or tax advice. Rules, fees, and deadlines change; confirm with the agency before you file or pay.