If you run a Virginia-based fleet that crosses state lines, your Virginia IFTA quarterly tax return is filed on form RDT 121 through the DMV’s VIIM portal, due on the last day of the month after each calendar quarter. The return reconciles the fuel tax you already paid at the pump against what you actually owe each jurisdiction your trucks drove through, and you’ll end up either paying a balance or carrying a credit forward.
Who Has to File
You need a Virginia IFTA license and must file quarterly if you operate a qualified motor vehicle that travels in Virginia plus at least one other IFTA jurisdiction. IFTA jurisdictions include every U.S. state except Alaska and Hawaii, and every Canadian province except the Northwest Territories, Nunavut, and Yukon. Virginia can serve as your base jurisdiction only if your business maintains an established place of operations in the Commonwealth where mileage is accrued and records are kept.1Virginia Department of Motor Vehicles. International Fuels Tax Agreement (IFTA)
A qualified motor vehicle is one used to transport people or property that either has two axles and a gross or registered gross weight above 26,000 pounds, or has three or more axles regardless of weight. Recreational vehicles are excluded even if they meet those thresholds.
You must file for every quarter the license is active, even if your trucks didn’t move. A zero-mileage return keeps the account current; skipping it draws the same penalties as any other late filing.
Quarterly Deadlines
Returns are due the last day of the month following the close of each quarter:
- Q1 (January–March): due April 30
- Q2 (April–June): due July 31
- Q3 (July–September): due October 31
- Q4 (October–December): due January 31
When a deadline falls on a Saturday, Sunday, or legal holiday, filing moves to the next business day.2Virginia Department of Motor Vehicles. IFTA Tax Return Instructions Payment on a balance-due return has to be received by the deadline, not just postmarked, to avoid late charges.
What Goes on the Return
Form RDT 121 has two parts: a main return that summarizes your total liability or credit, and a jurisdictional schedule where you break out miles, gallons, and tax for each state or province you ran in.3Virginia Department of Motor Vehicles. International Fuel Tax Agreement (IFTA) Tax Return Before you start, you need four numbers for the quarter:
- Total miles driven across all jurisdictions
- Miles driven within each individual jurisdiction
- Total gallons purchased, with documentation that tax was paid
- Gallons purchased in each jurisdiction, broken out by fuel type
The calculation itself follows a fixed sequence. Divide total miles by total gallons to get your fleet’s average MPG for the quarter. For each jurisdiction, divide taxable miles there by that MPG to get taxable gallons. Subtract the gallons you actually bought (tax-paid) in that jurisdiction. Multiply the net gallons by that jurisdiction’s quarterly tax rate. A positive result is tax owed; a negative result is a credit.
Fuel tax rates are set by each jurisdiction and can shift every quarter. IFTA, Inc. publishes the rate matrix before each quarter begins, and you have to use the rates for the quarter you’re actually filing.4IFTA, Inc. International Fuel Tax Association. IFTA Tax Rate Matrix If your fleet runs on more than one fuel type, calculate a separate average MPG for each.
Line-by-line guidance is in the DMV’s RDT 121-I instructions.2Virginia Department of Motor Vehicles. IFTA Tax Return Instructions Cross-check driver trip logs against fuel receipts before you commit the numbers. Transposed digits and miles allocated to the wrong state are exactly the kind of errors that produce audit adjustments later.
Don’t Forget the Virginia Surcharge
Virginia is one of a handful of jurisdictions that imposes a surcharge on top of the regular fuel tax. The surcharge is always a positive amount; it can’t be offset by credits. It’s calculated by multiplying the taxable gallons consumed in Virginia by the surcharge rate for the quarter and appears on its own line. Overlooking it is a common underpayment.
Submitting and Paying
Most Virginia carriers file through the VIIM (Virginia IFTA IRP Management) System, the DMV’s free online portal, which lets you prepare the return, review it, and pay in one session.5Virginia Department of Motor Vehicles. VIIM System If your recordkeeping software can export jurisdictional data, VIIM accepts a CSV import that eliminates most manual entry.
Payment options inside VIIM include electronic check, ACH debit, and credit card. Credit card payments of $10,000 or more carry a 1.5% service fee. ACH credit is also available but requires advance approval from the Motor Carrier management team.
To file on paper, mail the signed RDT 121 with a check or money order payable to DMV to:
Virginia Department of Motor Vehicles
P.O. Box 27412
Richmond, VA 23269-0001
When the return shows a net credit, you can apply it to a future quarter or request a refund.
Late Penalties, Interest, and Suspension
The penalty for a late or underpaid return is $50 or 10% of the tax due, whichever is greater.6Virginia Department of Motor Vehicles. IFTA Tax Reporting Requirements Interest accrues on top of that at an annual rate set by IFTA, equal to the IRS underpayment rate plus two percentage points. For 2026, the annual rate is 9%, charged monthly at one-twelfth of that figure.7IFTA, Inc. International Fuel Tax Association. IFTA Annual Interest Rates
Keep missing deadlines and your IFTA license will be suspended. Once that happens you can’t legally operate in any IFTA jurisdiction until you pay the outstanding tax, penalties, and interest, plus a $50 reinstatement fee. Running without valid IFTA credentials exposes you to citations in every state you enter.
Fixing a Return After You File
If you catch an error later, you can submit an amended return through VIIM to correct mileage, fuel, or jurisdictional figures. Misallocated miles, fuel purchases entered under the wrong state, and data-entry slips are the usual reasons. You have three years from the original due date to amend. If the correction increases what you owe, interest runs from the original due date, so fixing mistakes early limits the bill.
Records You Need to Keep
Your return is only as defensible as the records behind it. Virginia requires supporting documentation for every number on the filing, held for four years from the return’s due date or the date filed, whichever is later.8Virginia Department of Motor Vehicles. IFTA Record Keeping Requirements
Fuel records have to show the date of each purchase, the seller’s name and address, number of gallons, fuel type, price per gallon, and the jurisdiction of purchase. Distance records have to show, daily and per vehicle, trip origin and destination, route, starting and ending odometer readings, total trip miles, and miles by jurisdiction. ELDs and GPS fleet systems that capture timestamped locations with odometer readings and border crossings can produce this data automatically, and many export in formats compatible with VIIM’s CSV import.
If an audit finds your records inadequate for the fleet as a whole, the auditor will either reduce your reported MPG by 20% or default the fleet to 4.0 MPG, whichever produces a higher assessment.9IFTA, Inc. IFTA Audit Best Practices Guide Since most diesel trucks run somewhere around 5.5 to 6.5 MPG, a drop to 4.0 inflates taxable gallons in every jurisdiction and produces a large bill. If you produce no records at all, the auditor assesses based on best information available and you lose the right to claim refunds or credits.