Connecticut IFTA Fuel Tax Rate, 4th Quarter 2024
Connecticut's IFTA diesel rate for the 4th quarter of 2024 is $0.5240 per gallon, unchanged from Q3 2024.
Connecticut rate for Q4 2024
Special diesel, Q4 2024
$0.5240
per US gallon, unchanged from Q3 2024
- Diesel tax rate
- $0.5240/gal
- Surcharge
- None listed
- Quarter
- Q4 2024, from Oct 1, 2024
- Change vs last quarter
- unchanged
Notes from the source
Matrix footnote #15 (CONNECTICUT): See Announcement 2024(1) Conversion Factors on Motor Vehicle Fuels Occurring In Gaseous Form for information about conversion factors for compressed natural gas and propane. See Announcement 2024(2) Motor Vehicle Fuels Tax Rate on Diesel Fuel Effective July 1, 2024.
Worked example: the Connecticut line of your IFTA return
Change the numbers to match your quarter. Prefilled with 10,000 total miles on 1,550 gallons, 1,200 of those miles in Connecticut, and 100 gallons bought there.
Connecticut vs. its neighbors, Q4 2024
| Jurisdiction | Diesel + surcharge | vs. CT |
|---|---|---|
| Connecticut | $0.5240 | — |
| New York | $0.3955 | −$0.1285 |
| Rhode Island | $0.3700 | −$0.1540 |
| Massachusetts | $0.2400 | −$0.2840 |
On an IFTA return, a higher rate doesn't mean you pay more overall. Fuel you buy in a high-rate state earns a bigger credit. What matters is where you burn the fuel versus where you buy it.
Connecticut rate, last 4 quarters
Source: IFTA, Inc. Fuel Tax Rate Matrix, 4th Quarter 2024 · Effective Oct 1, 2024 · Last verified Sep 28, 2026
IFTA, Inc. publishes the rates each member jurisdiction reports. Connecticut's tax agency is the final word on its rate.
Estimates for planning. Confirm with your tax pro or your base jurisdiction's IFTA office before filing.