If you haven’t filed your IFTA Q1 return yet, don’t panic. You can get this done in 15–30 minutes if you have your fuel receipts and mileage data organized. If you don’t have them organized, this guide will walk you through gathering what you need and filing before the deadline.
If you’re brand new to IFTA and don’t understand how it works yet, start with our IFTA for Beginners guide first. This article assumes you understand the basics and just need to get your Q1 return filed.
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 Q1 FILING CHECKLIST
Where to find your miles per state
Your ELD automatically tracks miles by state. Pull your Q1 mileage report (January 1 through March 31) from your ELD provider’s dashboard. Samsara, Motive, KeepTruckin, and most other ELDs have an IFTA-specific report that breaks down miles 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 quarterly report showing gallons purchased by state. Log into your fuel card dashboard and download the Q1 report.
If you pay cash or use a personal card, you need every fuel receipt from January through March. The receipt must show: date, location (state), number of gallons, and price per gallon. Missing a receipt means you lose that fuel credit — and you end up overpaying tax to that state.
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 Q1 CALCULATION
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 Q1 CALCULATION
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.
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STEP-BY-STEP: FILE YOUR IFTA Q1 RETURN
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.
Q1 MPG CALCULATION
Total Q1 miles: 22,500
Total Q1 gallons purchased: 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 state you drove through during Q1, 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 APRIL 30 DEADLINE
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 didn’t drive in Q1 (truck was down, between jobs, seasonal), you still need to 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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2026 IFTA QUARTERLY DEADLINES (ALL 4 QUARTERS)
Mark these on your calendar now so you’re never scrambling again. Every deadline falls on the last day of the month following the quarter end.
📅 2026 IFTA DEADLINES
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
The IFTA Q1 2026 filing deadline is April 30, 2026. This covers miles driven and fuel purchased from January 1 through March 31, 2026. Late filings incur a $50+ penalty per state plus interest on any tax owed.
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.
Late IFTA filings incur penalties starting at $50 per state plus interest (typically 1% per month) 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.