Most IFTA fuel tax can be offset by credits when you purchase more fuel in a state than you consume there. But four states break that rule completely. Kentucky, Virginia, New York, and New Mexico impose fuel tax surcharges that are always owed, every time, no matter how much fuel you bought there. If you drive through any of these states regularly, understanding the surcharge rules can prevent costly filing errors.
What Is an IFTA Surcharge?
A surcharge is an additional fuel tax on top of a state's base IFTA rate. What makes surcharges unique — and confusing — is how they are calculated. Regular IFTA tax is computed on net taxable gallons (gallons consumed minus gallons purchased). If you over-fuel in a state, that net figure goes negative and you get a credit. Surcharges are computed on total gallons consumed, period. There is no subtraction of purchased gallons. The surcharge is always positive, always owed, and never generates a credit.
Virginia: The Highest Surcharge in the US
Virginia charges a 6.5 cents per gallon surcharge on all diesel gallons consumed in the state. Combined with Virginia's base IFTA diesel rate of $0.302/gal, the total effective diesel rate in Virginia is $0.367/gal — but unlike the base rate, the surcharge portion cannot be reduced by purchasing fuel in Virginia.
A truck that drives 2,000 miles in Virginia with a fleet MPG of 6.5 consumes approximately 307.7 gallons in Virginia. The surcharge is: 307.7 × $0.065 = $20.00. You owe this even if you filled up 500 gallons in Virginia. The credit from those 500 gallons only offsets the base rate portion, not the surcharge.
Virginia is the most impactful surcharge for carriers running the I-81 corridor, I-95 through the state, or any route along the East Coast. It is a fixed cost of doing business in Virginia that no fueling strategy can eliminate.
Kentucky: Surcharge Plus KYU Tax
Kentucky charges a 2.0 cents per gallon surcharge applied to total diesel gallons consumed in the state. But Kentucky has a second complexity: the KYU (Kentucky Unified Carrier Registration) weight-distance tax.
The KYU tax applies to trucks with a combined gross weight of 59,999 lbs or more. It is calculated on miles driven in Kentucky multiplied by a per-mile rate that varies by vehicle weight class. The KYU tax is completely separate from IFTA — it is filed directly with the Kentucky Transportation Cabinet, not on your IFTA return.
If you haul through Kentucky regularly, you need to manage three separate Kentucky tax obligations: the base IFTA rate, the IFTA surcharge, and the KYU weight-distance tax. Missing the KYU filing is a separate violation from IFTA non-compliance.
New York: Three Layers of Tax
New York's IFTA surcharge is 0.95 cents per gallon, the smallest of the four. But New York stacks two additional obligations on top:
- Highway Use Tax (HUT): Required for trucks over 18,000 lbs gross weight. Calculated on miles driven in New York, filed separately with the NYS Tax Department.
- Truck Mileage Tax: Applies to certain trucks based on weight and mileage in New York.
Carriers running I-87, I-90, or the thruway system through New York face the base IFTA rate, the IFTA surcharge, and the HUT as separate obligations. The HUT alone requires its own registration, permit, and quarterly filing. Missing any of these can result in fines at New York's notoriously active weigh stations.
New Mexico: Weight Distance Tax
New Mexico has a 1.0 cent per gallon IFTA surcharge plus a separate Weight Distance Tax (WDT) for vehicles over 26,000 lbs. The WDT is filed with the New Mexico Motor Vehicle Division and is calculated on vehicle weight class and miles driven in New Mexico.
New Mexico is a common transit state for freight moving between Texas and California on I-10 and I-40. Carriers on these routes need to budget for both the IFTA surcharge and the WDT as fixed operating costs in New Mexico.
Surcharge Summary Table
| State | Surcharge Rate | Calculated On | Additional Tax |
|---|---|---|---|
| Virginia (VA) | $0.0650/gal | Total consumed gallons | None |
| Kentucky (KY) | $0.0200/gal | Total consumed gallons | KYU weight-distance (59,999+ lbs) |
| New Mexico (NM) | $0.0100/gal | Total consumed gallons | Weight Distance Tax (26,000+ lbs) |
| New York (NY) | $0.0095/gal | Total consumed gallons | HUT (18,000+ lbs) |
How Our Calculator Handles Surcharges
The IFTACalculators.com free calculator automatically applies the correct surcharge calculation for all four states. When you enter miles driven in Virginia, Kentucky, New York, or New Mexico, the calculator computes the surcharge on total consumed gallons (not net), shows it as a separate line item, and adds it to your net total. The surcharge always shows as a positive amount regardless of your fueling in that state.
Route Planning with Surcharges in Mind
You cannot eliminate surcharge costs, but you can plan for them. Before quoting a load through surcharge states, add the estimated surcharge to your fuel cost calculation. A 500-mile run through Virginia at a fleet MPG of 6.5 means roughly 76.9 gallons consumed × $0.065 = $5.00 in Virginia surcharge alone. Across a full quarter with regular Virginia miles, this adds up significantly. Use our calculator to model the exact surcharge impact for your specific routes before you commit to rates.