This page is the deadline list and the filing checklist for any IFTA quarter. Use the table for the three months on the return and the day it is due. If that calendar day is a Saturday, Sunday, or legal holiday, R960 in the August 2026 edition of the Articles of Agreement moves it to the next business day. That is why the July–September return is due November 2, 2026, and the October–December return is due February 1, 2027.
The same five steps apply every quarter: miles by jurisdiction, gallons by jurisdiction, average MPG, file with your base jurisdiction, save the confirmation. If you did not drive that quarter, you still file a zero return.
New to the tax itself? Read IFTA explained simply. Ready to file line by line? Use the IFTA filing guide for owner-operators. Comparing tools? See IFTA software for owner-operators.
American Truckers LLC started as a dispatch company. We filed IFTA returns for our carriers for years before we ever wrote about it — we know which ELD reports actually give you the right numbers, which states audit hardest, and where new operators leave money on the table. The walkthrough below is exactly the process we used to file in 15 minutes a quarter.
QUICK ANSWER
To file the quarter you are in: (1) pull that quarter’s mileage-by-jurisdiction report from your ELD; (2) download the fuel-card report for the same dates (or gather paper receipts); (3) calculate average MPG (total miles ÷ total gallons); (4) log into your base jurisdiction’s IFTA portal and enter miles and gallons; (5) review, pay the net tax or accept the credit, submit, and save the confirmation. A zero-mile quarter is still a return. A late return is $50 or 10% of the net tax owed, whichever is greater, plus interest on unpaid tax.
WHAT YOU NEED BEFORE YOU START (5-MINUTE CHECKLIST)
Gather these four things before you sit down to file. If you have all four, the actual filing takes 10–15 minutes.
📋 IFTA FILING CHECKLIST (ANY QUARTER)
Where to find your miles per state
Your ELD tracks miles by jurisdiction. Pull the mileage report for the three months on the return you are filing. Samsara, Motive, and most other ELDs have an IFTA report that breaks the miles down by jurisdiction.
If you don’t have an ELD report, you can use trip sheets or odometer readings at each state line crossing. This is significantly more work and less accurate — another reason to get an ELD with automatic IFTA tracking.
Where to find your fuel purchases per state
If you use a fuel card, your provider has a report of gallons purchased by jurisdiction. Download the report for the same three months as the mileage report.
If you pay cash or use a personal card, you need every fuel receipt from that quarter. The receipt must show the date, the state, the gallons, and the price per gallon. A missing receipt means you lose that fuel credit, and you pay tax on fuel you already bought.
HOW IFTA TAX IS CALCULATED (THE 2-MINUTE VERSION)
IFTA is not a tax on fuel. It is a redistribution of fuel tax you already paid. Here is the logic:
- You buy fuel in some states but drive through many states. When you buy diesel in Texas, you pay Texas fuel tax. But you also drove through Oklahoma, Arkansas, and Tennessee that week — and those states deserve a share of fuel tax for using their roads.
- IFTA settles the difference. For each state, IFTA compares fuel consumed (miles driven ÷ your MPG) vs fuel purchased. If you consumed more than you purchased, you owe that state. If you purchased more than you consumed, you get a credit.
- The net result is what you owe or get refunded. Most operators owe a small net amount ($50–$300/quarter) because they tend to buy fuel in low-tax states and drive through high-tax states.
EXAMPLE: TEXAS, ANY QUARTER
Miles driven in Texas: 3,200
Your average MPG: 6.5
Fuel consumed in Texas: 3,200 ÷ 6.5 = 492 gallons
Fuel purchased in Texas: 600 gallons
Difference: 600 − 492 = +108 gallons (credit)
You bought MORE fuel in Texas than you used there → Texas owes you a credit.
EXAMPLE: OKLAHOMA, ANY QUARTER
Miles driven in Oklahoma: 1,800
Your average MPG: 6.5
Fuel consumed in Oklahoma: 1,800 ÷ 6.5 = 277 gallons
Fuel purchased in Oklahoma: 0 gallons
Difference: 0 − 277 = −277 gallons (owe)
You drove through Oklahoma without buying fuel → you owe Oklahoma tax on 277 gallons.
Your total IFTA payment is the net of all state credits and debits. The filing system calculates each state’s tax rate automatically — you just enter the miles and gallons.
📋 THE IFTA FILING DEFENDER
Step-by-step filing walkthrough plus a 321-formula spreadsheet that calculates your tax by state automatically. Enter your miles and fuel purchases — it does the rest.
IFTA Filing Defender — $14.99Also in the First Year Survival System — four tools for $64.99 (save $24.97 / 28% versus $89.96) — See the Survival System →
STEP-BY-STEP: FILE THE QUARTER YOU ARE IN
Step 1: Calculate your average MPG
Total miles driven (all states) ÷ total gallons purchased (all states) = your MPG for the quarter. Use this single MPG number for all state calculations.
ONE QUARTER, MPG
Total miles that quarter: 22,500
Total gallons purchased that quarter: 3,462
Average MPG: 22,500 ÷ 3,462 = 6.50 MPG
Step 2: Log in to your state’s IFTA portal
You file with your base state — the state where you got your IFTA license. Every state has an online portal. Search for “[your state] IFTA filing” or go directly to your state’s Department of Revenue or Motor Carrier Services website. You will need your IFTA account number and login credentials.
Step 3: Enter miles driven per state
For each jurisdiction you drove through during that quarter, enter total miles. Include both loaded and empty miles. Do not include miles driven in non-IFTA jurisdictions (Alaska, Hawaii, DC, and most Canadian territories have separate rules).
Step 4: Enter fuel purchased per state
For each state where you purchased fuel, enter total gallons. The system will use your MPG to calculate fuel consumed vs fuel purchased for each state and determine what you owe or are owed.
Step 5: Review and submit
The system calculates your net tax automatically. Review the numbers, pay any amount owed (ACH or credit card), and submit. Save your confirmation number.
WHAT HAPPENS IF YOU MISS THE DUE DATE
Don’t miss it. The penalties are real and they stack.
⚠️ IFTA LATE FILING PENALTIES
If your IFTA license gets revoked, you cannot legally operate across state lines. Weigh station officers check IFTA status. Getting caught without a valid IFTA license is an immediate fine and potentially an out-of-service order — meaning your truck sits until you resolve it.
5 COMMON IFTA MISTAKES THAT COST YOU MONEY
1. Not tracking fuel purchases by state
Every untracked gallon is a lost credit. If you buy 300 gallons in a quarter and can only prove 250, you lose the tax credit on 50 gallons. At $0.30–$0.60/gallon in fuel tax, that is $15–$30 in overpayment. Multiply by 4 quarters and it adds up.
2. Forgetting to include deadhead miles
IFTA requires all miles driven in each state — loaded and empty. If you only report loaded miles, your MPG calculation will be artificially high, which means you’ll underreport fuel consumed in each state. An auditor will catch this immediately.
3. Rounding MPG up
If your actual MPG is 6.3, report 6.3 — not 7.0. Rounding up means you report consuming less fuel per state, which means you pay less tax per state. Auditors know average MPGs by truck type and will flag anything that looks inflated.
4. Not filing a zero return
If you did not drive that quarter (the truck was down, you were between jobs, or the work is seasonal), you still file a zero return. Not filing counts as a late filing and triggers the $50 penalty.
5. Mixing personal and business fuel purchases
If you have a personal vehicle on the same fuel card, those gallons should not be included in your IFTA filing. Only report fuel purchased for your IFTA-qualified commercial vehicle. This is another reason to keep a dedicated business fuel card separate from personal purchases.
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53 pre-built deduction categories including fuel tracking by state, per diem calculator, and quarterly tax estimates. Track every deduction all year — never scramble at deadline again.
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2026 IFTA QUARTERLY DEADLINES (ALL 4 QUARTERS)
Each return is due the last day of the month after the quarter closes. If that day is a Saturday, Sunday, or legal holiday, R960 in the August 2026 edition of the Articles of Agreement moves it to the next business day. October 31, 2026 is a Saturday, so the July–September return is due Monday, November 2. January 31, 2027 is a Sunday, so the October–December return is due Monday, February 1. A late return is $50 or 10 percent of the delinquent tax, whichever is greater (R1220), plus interest under R1230.
| Quarter | Months on the return | Due date |
|---|---|---|
| Q1 | January–March | April 30, 2026 |
| Q2 | April–June | July 31, 2026 |
| Q3 | July–September | November 2, 2026 |
| Q4 | October–December | February 1, 2027 |
For all your 2026 tax deadlines including estimated tax payments, Form 2290, and IFTA on one page, see our full deadline calendar.
RELATED GUIDES
FREQUENTLY ASKED QUESTIONS
Q1, January through March, is due April 30, 2026. Q2, April through June, is due July 31, 2026. Q3, July through September, is due Monday, November 2, 2026, because October 31 is a Saturday. Q4, October through December, is due Monday, February 1, 2027, because January 31 is a Sunday. R960 in the August 2026 edition of the Articles of Agreement moves a Saturday, Sunday, or legal-holiday due date to the next business day.
You need four things: total miles driven in each state or province, total gallons of fuel purchased in each state or province (with receipts), your average miles per gallon for the quarter, and your IFTA account number. Your ELD automatically tracks miles by state. Fuel receipts must show gallons, price, date, and location.
A late IFTA return costs $50 or 10% of the net tax owed, whichever is greater, plus interest (set each year at the IRS underpayment rate plus 2 points, charged monthly) on any unpaid tax. If you owe a net tax amount, interest accrues from the due date. Continued non-filing can result in IFTA license revocation, which means you cannot legally operate across state lines. IFTA audits can go back 4 years.
IFTA tax is calculated by comparing fuel purchased vs fuel consumed in each state. Your average MPG determines fuel consumed per state: miles driven in state divided by MPG equals gallons consumed. If you consumed more fuel in a state than you purchased there, you owe that state tax. If you purchased more than you consumed, you get a credit. The net across all states determines whether you owe or get a refund.
Yes. Most states offer online IFTA filing through their Department of Revenue or Motor Carrier Services website. You log in with your IFTA account credentials, enter miles and fuel data by state, and the system calculates your tax automatically. Payment is typically by ACH or credit card. Processing takes 1–3 business days.
⛽ READY TO FILE? THE IFTA FILING DEFENDER
A 14-page plain-English filing guide plus a 321-formula spreadsheet. Enter your miles and fuel by state and each state’s current tax rate — it does the math. Works in Excel & Google Sheets. 30-Day Money-Back Guarantee.
Get the IFTA Filing Defender — $14.99Still choosing between IFTA apps and filing services? See our 2026 IFTA software comparison →