Connecticut car sales tax and DMV fees

The $50,000 line and how the trade-in fits

Connecticut taxes most car purchases at 6.35%, but Section 12-408 of the General Statutes applies 7.75% to the entire price of a vehicle sold for more than $50,000. It is a cliff, not a bracket: a $52,000 car pays $4,030, not 6.35% on the first $50,000. The Department of Revenue Services looks at the price before the trade-in to decide which rate applies, then taxes the price minus the trade-in, so the same $52,000 car with a $10,000 trade-in still pays 7.75%, or $3,255. A trade-in is credited only when the seller is a licensed dealer. From a private seller, DMV collects the tax on the NADA average trade-in value or the bill of sale, whichever is higher.

Three years of registration, several small fees

A passenger registration costs $120 and runs three years. Around it come three statutory add-ons: the federal Clean Air Act fee ($15 for three years, not charged on electric cars), the Passport to the Parks fee, raised to $24 on July 1, 2025 and paid into the state's Passport to the Parks account, and a greenhouse gas reduction fee, $15 once for a new car and $7.50 per term for any other vehicle. New and nearly new cars also pay $40 once instead of an emissions test during their first four model years. An electric car skips the Clean Air Act fee, the exemption fee and the test, which is why a new EV costs $2,421.50 instead of $2,476.50 at the same price. See the EV fee table for states that charge electric cars more, not less.

The town car tax arrives later

Each October 1, assessors list the cars garaged in their town and bill the owners: 70% of the car's value times the local motor vehicle mill rate, which state law caps at 32.46 mills, about 2.27% of the full value. Each town or district sets its own rate at or below that cap, and the law allows zero. The bill comes from the town tax collector, so budget it next to the DMV fees. Across the border, New York has no yearly tax on a car's value.

What sets Connecticut apart

• Connecticut taxes a car at 6.35%, but the whole price is taxed at 7.75% when it exceeds $50,000 (Conn. Gen. Stat. § 12-408(1)(H)).
• The Department of Revenue Services tests the $50,000 threshold before the trade-in is deducted, then applies the rate to the price less the trade-in (Connecticut DRS).
• DMV grants full trade-in credit only on a purchase from a licensed dealer; a private sale is taxed on the NADA average trade-in value or the bill-of-sale price, whichever is higher (Connecticut DMV).
• A passenger registration costs $120 for three years, plus a $15 federal Clean Air Act fee that electric cars do not pay (Conn. Gen. Stat. § 14-49b).
• Since July 1, 2025, every three-year registration carries a $24 Passport to the Parks fee, paid into the state's Passport to the Parks account (Conn. Gen. Stat. § 14-49b).
• A new car pays a $15 greenhouse gas reduction fee at its first registration, and other vehicles pay $7.50 per three-year registration (Conn. Gen. Stat. § 22a-201c).
• Cars in their first four model years skip the emissions test but pay a one-time $40 emissions exemption fee, and the test then costs $20 every two years (Connecticut DMV).
• Towns tax cars as property at 70% of value, and the motor vehicle mill rate cannot exceed 32.46 mills (Conn. Gen. Stat. §§ 12-62a and 12-71e).
• Connecticut does not cap the dealer conveyance fee, but the dealer must show it separately and state that it is negotiable (Conn. Gen. Stat. § 14-62 (2026 Supplement)).
• A 2016 legislative study cited by the Office of Legislative Research found an average conveyance fee of $405 at new car dealers and $131 at used car dealers (Connecticut Office of Legislative Research).

What the Connecticut calculation cannot know

• Every town and city bills a yearly property tax on the car: 70% of its value times the local motor vehicle mill rate, capped by law at 32.46 mills. Rates and valuations are set locally, so the tax is listed without an amount.
• On a purchase from a private seller, DMV taxes the NADA average trade-in value or the bill-of-sale price, whichever is higher; the form does not ask the book value, so the engine taxes the price.
• Whether a dealer conveyance fee is part of the taxable sales price was not stated on an official page read for this release; the engine leaves it out of the taxed amount.
• Connecticut law does not cap the dealer conveyance fee; type the dealer's figure.
• The engine assumes the standard three-year passenger registration; drivers 65 and older may choose one year at a prorated fee.