How to File Your First IFTA Return (Step-by-Step for New Carriers)

You just got your motor carrier authority, your IFTA license, and your decals. Now what? Your first IFTA quarterly return is due, and you have no idea what to file, where to file it, or what data you need. This is the guide you wish someone had handed you on day one — a step-by-step walkthrough of filing your very first IFTA return, from gathering your records to submitting the form.

If you're a new carrier who just started operating in the last quarter, this guide covers everything you need to know to file correctly, on time, and without penalties.

In this guide, you will learn:

What an IFTA return is and why you file it
Where to file (your base jurisdiction)
What data you need to gather before filing
Step-by-step instructions for completing the return
Common first-time mistakes and how to avoid them
Filing deadlines and late penalties

What Is an IFTA Return?

The International Fuel Tax Agreement (IFTA) is an agreement among the 48 contiguous US states and 10 Canadian provinces that simplifies fuel tax reporting for commercial motor vehicles operating across state lines. Instead of filing separate fuel tax returns in every state you drive through, you file a single quarterly return with your base jurisdiction, and IFTA redistributes the tax to each state based on your miles driven and fuel purchased.

Your IFTA return reports three things for each state you operated in during the quarter:

Miles driven in each state
Fuel consumed in each state (calculated from your fleet MPG)
Fuel purchased in each state (from your receipts)

The return calculates whether you owe additional tax to states where you drove more than you fueled, or whether you're owed a credit from states where you bought more fuel than your miles consumed. The net result is either a payment to your base jurisdiction or a credit applied to future quarters.

Step 1: Confirm Your Base Jurisdiction

Your base jurisdiction is the state or province where your carrier is registered and where your vehicles are based for vehicle registration. This is the state that issued your IFTA license, and it's where you file your quarterly return.

If you're based in Texas, you file with the Texas Comptroller. If you're based in Indiana, you file with the Indiana Department of Revenue. Your base jurisdiction collects the total tax (or issues the refund) and then distributes the funds to other states on your behalf.

You should already know your base jurisdiction because it's the state where you applied for your IFTA license. If you haven't applied yet, contact your state's department of revenue or motor carrier division to register.

Step 2: Gather Your Records

Before you sit down to file, you need four sets of data covering the entire quarter:

Odometer Readings

You need the odometer reading for each qualified vehicle at the start and end of the quarter. The difference is your total miles for the quarter. If you started operating mid-quarter, use the odometer reading from your first day of operations as the starting point.

First-timer tip: If you didn't record your odometer reading on the first day of the quarter, check your vehicle purchase paperwork, registration documents, or any maintenance records from around that date. Going forward, make it a habit to photograph your odometer on the first and last day of each quarter.

Miles by State

You need to know how many miles you drove in each state during the quarter. This is the hardest data to gather manually. Options include:

Trip logs: If you kept written records of each trip with state-by-state mileage breakdowns, compile them by state.
Mapping software: If you have origin-destination records for each trip, you can use a routing tool to estimate state miles. This is less accurate than actual tracking but acceptable for your first quarter.
GPS tracking app: If you used a GPS-based IFTA tracking app from the start, your state miles are already calculated. This is the ideal scenario.
ELD data: If you have an electronic logging device, some ELD providers offer IFTA mileage reports. Check if your ELD tracks state crossings.

Your total state miles must reconcile with your odometer miles. Add up all your state miles — the total should be within 2–3% of your odometer difference. If there's a large gap, you're missing miles somewhere.

Fuel Receipts

Collect every fuel receipt from the quarter. Each receipt should show:

Date of purchase
Seller's name and address (this determines which state gets the credit)
Number of gallons
Fuel type (diesel, gasoline, etc.)
Price per gallon or total cost
Vehicle unit number or license plate

Organize your receipts by state. Add up the total gallons purchased in each state — these are your "tax-paid gallons" because you already paid that state's fuel tax at the pump.

First-timer tip: If you use a fleet fuel card (like Comdata, EFS, or WEX), your monthly statement already has all this information organized by transaction. Download the quarter's statements and use those instead of individual paper receipts. Fuel card reports are also easier for auditors to verify.

Vehicle Information

You need the unit number, license plate, and fuel type for each qualified vehicle. IFTA applies to vehicles with a gross vehicle weight (GVW) or registered gross vehicle weight (RGVW) over 26,000 pounds, or vehicles with three or more axles regardless of weight. If you're a new carrier with one truck, this is straightforward. If you have multiple vehicles, list each one.

Step 3: Calculate Your Fleet MPG

Your fleet MPG is the total miles driven by all qualified vehicles divided by the total fuel consumed by all qualified vehicles during the quarter.

Fleet MPG = Total miles ÷ Total gallons consumed

For example, if your truck drove 30,000 miles and you purchased 5,000 gallons of diesel:

Fleet MPG: 30,000 ÷ 5,000 = 6.00 MPG

Carry this to at least two decimal places (e.g., 6.17, not just 6). Rounding to a whole number or one decimal introduces errors that multiply across every state row on your return.

First-timer tip: A typical loaded semi-truck gets between 5.5 and 7.0 MPG. If your calculation produces a number outside this range, double-check your miles and fuel totals. An unusually high MPG usually means you're missing fuel receipts. An unusually low MPG might mean you included reefer fuel or non-highway fuel in your total.

Step 4: Complete the IFTA Return Form

Most states offer online filing through their tax portal. You'll log in with the account you created when you applied for your IFTA license. The online form walks you through each section, but here's what you're filling in:

Header Information

Your carrier name, IFTA license number, account number, the quarter and year you're filing for, and your fleet MPG.

State-by-State Schedule

For each state where you operated, you enter:

Total miles in state: From your trip logs or GPS data
Taxable gallons: State miles ÷ fleet MPG
Tax-paid gallons: Gallons purchased in that state (from your receipts)
Net taxable gallons: Taxable gallons minus tax-paid gallons
Tax rate: The state's current quarter diesel tax rate (provided on the form or from the IFTA rate table)
Tax due: Net taxable gallons × tax rate

If net taxable gallons is positive (you consumed more fuel than you bought in that state), you owe tax. If it's negative (you bought more than you consumed), you get a credit.

Totals and Payment

The form totals all your state taxes and credits. The net result is either:

Tax due: You owe money. Pay when you submit the return.
Credit: You overpaid at the pump relative to your miles. The credit carries forward to next quarter or can be refunded (policies vary by state).

Step 5: Submit and Pay

Submit your return through your base jurisdiction's online portal. If you owe tax, pay electronically — most states accept ACH, credit card, or electronic check. Keep a confirmation number or receipt for your records.

If you owe nothing or have a credit, you still must file the return. Filing a zero return is required even if you didn't operate during the quarter. Failure to file — even a zero return — results in penalties and can lead to IFTA license suspension.

Filing Deadlines

IFTA returns are due on the last day of the month following the quarter:

Q1 (Jan–Mar): Due April 30
Q2 (Apr–Jun): Due July 31
Q3 (Jul–Sep): Due October 31
Q4 (Oct–Dec): Due January 31

If the due date falls on a weekend or holiday, the deadline moves to the next business day. Late returns incur penalties and interest — typically a flat penalty (often $50 or more) plus interest on any tax owed, calculated from the original due date.

First-timer tip: Don't wait until the last week to start. Gathering records, calculating state miles, and filling out the form takes time the first time around. Start at least two weeks before the deadline.

State Portal Links for Common Base Jurisdictions

Here are the IFTA filing portals for some of the most common base jurisdictions. Search for "IFTA filing" on your state's department of revenue website if your state is not listed.

Texas: Texas Comptroller — Webfile system (comptroller.texas.gov)
California: CDTFA Online Services (cdtfa.ca.gov)
Florida: Florida Department of Revenue (floridarevenue.com)
Georgia: Georgia Tax Center (gtc.dor.ga.gov)
Indiana: Indiana Department of Revenue — INTIME portal (intime.dor.in.gov)
Ohio: Ohio Department of Taxation (tax.ohio.gov)
Pennsylvania: Pennsylvania Department of Revenue — myPATH (mypath.pa.gov)
Illinois: Illinois Department of Revenue — MyTax portal (mytax.illinois.gov)
North Carolina: NCDMV IFTA portal (ncdot.gov)
Tennessee: Tennessee Department of Revenue — TNTAP (tntap.tn.gov)

Common First-Time Mistakes

Not Filing at All

Some new carriers assume they don't need to file until they've been operating for a full quarter. Wrong. If you got your IFTA license mid-quarter and drove even one trip, you must file for that quarter. Even if you got your license and drove zero miles, you must file a zero return.

Forgetting States You Drove Through

New carriers often only list their origin and destination states, forgetting the states they passed through. A trip from Georgia to New Jersey crosses South Carolina, North Carolina, Virginia, Maryland, Delaware, and possibly the District of Columbia. Every one of those states must appear on your return with the appropriate miles.

Using the Wrong Tax Rates

IFTA tax rates change every quarter. Make sure you're using the rates for the quarter you're filing, not the current quarter's rates. Your base jurisdiction's filing portal should auto-populate the correct rates, but if you're calculating manually, download the rate table from iftach.org for the specific quarter.

Not Keeping Records

IFTA requires you to retain all source documents — trip logs, fuel receipts, odometer readings — for four years from the filing date. Start a filing system on day one. Whether it's a folder in your filing cabinet, a box of receipts, or a digital system, organize by quarter and keep everything.

Mixing Up Total Miles and IFTA Miles

Your IFTA return only covers miles driven in IFTA jurisdictions (the 48 contiguous US states and 10 Canadian provinces). If you operate in Alaska, Hawaii, the District of Columbia (in some cases), or non-IFTA Canadian territories, those miles are reported separately. For most new carriers operating in the lower 48, this isn't an issue — but be aware of it if your routes include non-IFTA areas.

Calculating MPG Wrong

Your fleet MPG is total miles divided by total fuel — not the average of individual trip MPGs. If trip 1 was 6.2 MPG and trip 2 was 5.8 MPG, your fleet MPG is NOT (6.2 + 5.8) / 2 = 6.0. It's the sum of all miles divided by the sum of all gallons. The difference matters when trips have different lengths and fuel consumption.

What If You Made a Mistake?

If you discover an error after filing, submit an amended return. Every base jurisdiction allows amendments, and filing a correction voluntarily before an audit is always better than having the error discovered. Most states have an amendment option in their online portal. You'll owe interest on any additional tax from the original due date, but you can usually avoid penalties if you self-correct promptly.

Filing Your First Return: A Checklist

Use this checklist to make sure you have everything before you start:

IFTA license number and account credentials for your base jurisdiction's portal
Odometer readings for each vehicle at quarter start and end
Miles driven in each state (from trip logs, GPS, or ELD)
All fuel receipts organized by state
Total gallons purchased by state
Fleet MPG calculated to two decimal places
Current quarter's IFTA tax rate table
Payment method ready (ACH, credit card, or check)

Frequently Asked Questions

I only operated for part of the quarter. Do I still file?

Yes. File for the entire quarter using the miles and fuel from the days you operated. Your odometer start is the reading on your first day of operation, and the end is the last day of the quarter.

I only drove in one state. Do I still need IFTA?

If you only operate within a single state and never cross state lines, you do not need an IFTA license. IFTA is specifically for vehicles operating in two or more IFTA jurisdictions. However, once you cross one state line with a qualified vehicle, you need IFTA.

Can I hire someone to file for me?

Yes. Many bookkeepers, accountants, and trucking service companies will prepare and file your IFTA return for a fee, typically $50 to $200 per quarter. You still need to provide them with your miles and fuel data. Alternatively, IFTA tracking software like FleetCollect generates a completed return from GPS data and fuel logs that you can file directly.

What if I owe more tax than I expected?

This is common for new carriers, especially those who fueled heavily in low-tax states. You still owe the tax — IFTA redistributes fuel tax based on where you drove, not where you bought fuel. Plan for IFTA as a quarterly expense and set aside funds each month to cover the potential liability.

Can I file a paper return?

Some states still accept paper returns, but most strongly encourage or require electronic filing. Check with your base jurisdiction. Electronic filing is faster, reduces errors (the system validates your math), and gives you instant confirmation.

Bottom Line

Your first IFTA return feels overwhelming, but it's fundamentally simple: report where you drove, how much fuel you bought, and let the math distribute the tax. The hardest part is gathering accurate state mileage data — which is why most carriers switch to GPS tracking after their first manual filing. Tools like FleetCollect track your state miles automatically from day one, log your fuel purchases, calculate your fleet MPG, and generate a ready-to-file quarterly return. Whether you file manually or use software, the key is to start organized, keep your receipts, and never miss a deadline.