Connecticut IFTA Registration and Compliance Guide

To set up IFTA in Connecticut, you must register with the Department of Revenue Services (DRS) through the Taxpayer Service Center (TSC). Any motor carrier based in Connecticut that operates a qualified motor vehicle across state lines or into Canadian provinces is required to obtain an IFTA license and decals to report fuel use taxes. A qualified vehicle is one with three or more axles or a gross vehicle weight exceeding 26,000 pounds. DispatchTool assists Connecticut carriers by automating the collection of GPS-based mileage data and fuel purchase records across all jurisdictions. The platform generates the detailed state-by-state reports required for quarterly filings, reducing the risk of manual audit errors and late-filing penalties. After configuring your mileage tracking, you can create a DispatchTool account to manage your fleet's regulatory documents and IFTA preparation.

Determining Connecticut Base Jurisdiction Eligibility

Before applying, you must confirm Connecticut is your base jurisdiction. According to the DRS, you qualify if your qualified motor vehicles are registered in Connecticut, you maintain an established place of business in the state with physical records, and you operate in at least one other IFTA member jurisdiction. A qualified motor vehicle is defined as having two axles and a gross vehicle weight (GVW) or registered GVW over 26,000 pounds, or having three or more axles regardless of weight. If your fleet only operates within Connecticut borders, you do not need an IFTA license, but you may still be subject to other state fuel taxes.

Registering via the DRS Taxpayer Service Center (TSC)

Connecticut requires all IFTA applications to be submitted electronically through the Taxpayer Service Center (TSC). New carriers must first register for a Connecticut Tax Registration Number. The IFTA application (Form CT-IFTA-2) requires your Federal Employer Identification Number (FEIN) or Social Security Number, USDOT number, and fleet details. There is no fee for the IFTA license itself in Connecticut; however, each set of two decals costs $10.00 per year. Once approved, the DRS will mail the license and the required external decals to your business address.

Annual Decal and License Requirements

The Connecticut IFTA license is valid for one calendar year, expiring on December 31. You must carry a copy of the license in the cab of each qualified motor vehicle and permanently affix the two decals to the exterior of the cab, one on each side. The 2024 and 2025 decal colors change annually to allow enforcement officers to identify current compliance at a glance. If you add a vehicle to your fleet mid-year, you must log into the TSC to order additional decals at the $10.00 rate. Operating without a valid license or visible decals can result in citations and fines starting at $100.00 per occurrence.

Quarterly Tax Filing Deadlines and Penalties

IFTA returns must be filed four times per year, even if no taxable fuel was used or no miles were driven during the quarter. The deadlines are April 30 (Q1), July 31 (Q2), October 31 (Q3), and January 31 (Q4). If a deadline falls on a weekend or holiday, the return is due the next business day. Failure to file by these dates results in a late penalty of $50.00 or 10% of the net tax due, whichever is greater. Interest also accrues at a rate of 1% per month on any unpaid tax balance from the date the tax was originally due until it is paid in full.

Recordkeeping for Audit Protection

The FMCSA and Connecticut DRS require carriers to maintain detailed records for four years from the filing date. These records must include Individual Vehicle Mileage Records (IVMR) showing the date of the trip, origin and destination, routes traveled, and odometer readings at jurisdiction borders. You must also keep all original fuel receipts or invoices that prove the tax was paid at the pump. These receipts must show the fuel type, quantity, price per gallon, and the location of the purchase. Inadequate recordkeeping can lead to the disallowance of tax-paid fuel credits during a state audit.

Calculating Net Tax Due or Credit

The tax is calculated based on the 'Total Miles' driven in all jurisdictions divided by 'Total Gallons' consumed to determine the average fleet MPG. You then apply this MPG to the miles driven in each specific state to find the 'Taxable Gallons' for that state. By comparing the 'Taxable Gallons' to the 'Tax-Paid Gallons' (fuel actually purchased in that state), you determine if you owe money or are due a credit. Connecticut's diesel tax rate often fluctuates; as of recent updates, the rate is approximately 49.2 cents per gallon, but carriers must check the current quarterly IFTA tax rate table for all 58 member jurisdictions.

Connecticut Highway Use Fee (HUF)

Separate from IFTA, Connecticut implemented a Highway Use Fee (HUF) effective January 1, 2023. This fee applies to any carrier operating a vehicle with a GVW of 26,001 pounds or more in the state. The fee is calculated based on the vehicle's weight and the number of miles driven on Connecticut roads, ranging from 2.5 cents per mile for vehicles at 26,001 pounds to 17.5 cents per mile for those over 80,000 pounds. While reported through the same TSC portal, this is a distinct tax from the IFTA fuel use tax and requires its own registration and monthly filing.

Sources

Connecticut Department of Revenue Services (2024) — https://portal.ct.gov/drs/myce/ifta-manual International Fuel Tax Association, Inc. (2025) — https://www.iftach.org/ FMCSA - Fuel Taxes (2024) — https://www.fmcsa.dot.gov/registration/fuel-taxes

Frequently asked

How much does IFTA registration cost in Connecticut?

While there is no fee for the IFTA license itself, Connecticut charges $10.00 for each set of two decals required per vehicle. These must be renewed annually.

Can I file my Connecticut IFTA return by mail?

No, the Connecticut Department of Revenue Services (DRS) mandates that all IFTA returns and payments be submitted electronically through the Taxpayer Service Center (TSC) portal.

What happens if I don't drive any miles in a quarter?

You must still file a 'Zero Report' through the TSC by the quarterly deadline. Failure to file a zero report results in a $50.00 late filing penalty.

How long do I need to keep my fuel receipts?

You must retain all fuel receipts and mileage records for a minimum of 4 years. This allows the DRS to verify your filings during a standard audit cycle.

Does Connecticut IFTA cover the Highway Use Fee?

No. The Highway Use Fee (HUF) is a separate weight-distance tax. While both are managed by the DRS, they require separate registrations and have different filing frequencies (Monthly for HUF, Quarterly for IFTA).