Indiana, Kentucky, New York, Vermont, and Washington charge hidden IFTA surcharges on top of base rates—here's what they cost in Q3 2026

Indiana's surcharge alone ($0.61/gallon) doubles your fuel-tax liability in that state; add Kentucky ($0.02/gal), New York ($0.0095/gal), and Virginia ($0.065/gal), and you're facing surcharge costs that most free calculators don't track.

Indiana's $0.61/gallon surcharge is the single largest IFTA liability trap in the country

Indiana's Motor Carrier Fuel Tax surcharge is $0.61 per gallon—the same amount as the base diesel rate itself. Your combined effective rate in Indiana is $1.22 per gallon for Q3 2026, the highest in the nation. According to Indiana's Department of Revenue, this surcharge applies to every gallon you consume in the state, not just gallons you purchase there. That distinction matters because it traps you into owing surcharge tax even when you've overpaid your base-rate liability through fuel purchases.

California's effective rate ($1.09/gal) is next-highest, but Indiana's dual-rate structure ($0.61 base + $0.61 surcharge) is in a category of its own. For a typical owner-operator who runs 3,000 miles in Indiana per quarter at 6.5 MPG, that's 461.5 gallons consumed—and 461.5 gallons × $0.61 = $281.50 in surcharge tax owed, regardless of how much fuel you actually bought in the state.

Kentucky ($0.02/gal), New York ($0.0095/gal), and Virginia ($0.065/gal) surcharges stack on base rates

Kentucky's surcharge is the smallest of the four at $0.02 per gallon, but it stacks on top of the $0.30 base rate, pushing the effective rate to $0.32/gal. New York's petroleum business tax surcharge is the lowest per-gallon at $0.0095; at 307.7 gallons consumed, that's $2.92 in surcharge liability. Virginia's surcharge of $0.065 per gallon is the second-highest and routinely overlooked by multi-state operators who focus on Indiana and forget the East Coast.

The IFTA, Inc. official tax matrix lists all four surcharges separately from base rates, and they all appear on your IFTA Schedule 2 as distinct line items. The critical trap: unlike base-rate overpayments, surcharges never create credits when your fuel purchased exceeds fuel consumed. If you buy 300 gallons in Kentucky but consume 384.6 gallons, you'll get a credit for the base-rate overpayment, but you still owe the full surcharge on all 384.6 gallons consumed.

Surcharge vs. base-rate overpayment: why Indiana fuel purchases don't cancel Indiana surcharge liability

The IFTA calculation formula is: (gallons consumed × rate) − (fuel purchased credit). That works for base rates. Surcharges operate differently: (gallons consumed × surcharge rate only), with no purchase credit allowed.

Say you buy 400 gallons in Indiana but consume 461.5 gallons. You'll generate a base-rate credit of 61.5 gallons × $0.61 = $37.52, which reduces your base-rate liability. You still owe the full surcharge on all 461.5 gallons consumed: 461.5 × $0.61 = $281.50. The overpayment in fuel purchases never touches the surcharge line.

Vermont and Washington do not impose IFTA surcharges

Some older free calculators still list Vermont and Washington as surcharge states. They are not. Vermont has no documented surcharge in the IFTA Inc. tax matrix or state Department of Revenue records. Washington's effective rate is $0.345 per gallon (base only), not $0.52/gal as outdated calculators claim. The confusion stems from conflating special fuel taxes (which some states impose outside IFTA) with IFTA surcharges (which appear on Schedule 2).

Always verify any rate claim against the official IFTA Inc. tax matrix and the state's Department of Revenue website before filing. Q3 2026 rates locked in by July 1, and you need confirmation before the July 31 filing deadline.

Q3 2026 worked example: 10,000-mile run across all four surcharge states

You're an owner-operator running 10,000 miles in Q3 2026: 3,000 in Indiana, 2,500 in Kentucky, 2,000 in New York, and 2,500 in other states. Your fleet averages 6.5 MPG. You buy 400 gallons in Indiana, 300 in Kentucky, 200 in New York, and 638 in other states (1,538 total).

Your base-tax liability before fuel-purchase credits is $486.13. Your surcharge liability (owed regardless of fuel purchased) is $292.13. Indiana's surcharge alone ($281.52) dominates the total. Even if you overpaid base tax by $118.50 in Indiana (400 gallons purchased vs. 461.5 consumed), that credit never reduces the $281.52 surcharge owed.

Total surcharge liability across Q3 2026: $292.13—all of it owed on top of whatever base-rate settlement you owe or receive.

How to catch surcharges before you file: IFTA Inc. tax matrix and state DOR confirmation

The IFTA Inc. official tax matrix is updated quarterly and maintained by member states themselves. Indiana, Kentucky, New York, and Virginia all flag surcharges separately from base rates. Before you file in late July, cross-check your calculator output against the official IFTA matrix and each state's Department of Revenue fuel-tax page.

If your calculator doesn't show surcharge line items on Schedule 2, it's outdated. You need to see four separate rows: base diesel rate, surcharge rate, base tax owed, and surcharge tax owed—for every state you operated in. Q3 2026 rates are final; there's no adjustment mechanism for surcharges after you file.