What Is the Sales Tax on Cars in Connecticut?

The sales tax on cars in Connecticut is 6.35% of the purchase price, rising to 7.75% once the total cost of a passenger or combination vehicle exceeds $50,000.¹ Both rates apply to new and used vehicles, and to purchases from dealerships and private sellers alike. The tax is collected by the Department of Motor Vehicles when you register the vehicle, not at the point of sale, which catches some buyers off guard. Connecticut has no local or municipal sales taxes, so the rate is the same statewide.²

When the 7.75% Rate Kicks In

The $50,000 threshold isn’t based on sticker price alone. Taxable additions like dealer documentation fees, transportation charges, and aftermarket accessories all count toward the total. A vehicle listed at $48,000 can easily cross the line once those extras are added.³

Manufacturer rebates don’t help you stay below the threshold either. The DMV treats rebates as taxable, so they generally don’t reduce the amount on which sales tax is calculated.⁴ If the sale price plus taxable additions total $51,000 before a $3,000 rebate, you still pay the 7.75% rate.

Buying From a Dealer

At a licensed dealer, the calculation is straightforward: 6.35% (or 7.75% above the threshold) applied to the purchase price. Connecticut gives you full trade-in credit, so you only pay tax on the difference between the new vehicle’s price and the trade-in allowance.¹ On a $42,000 car with a $12,000 trade-in, sales tax applies to $30,000. The portion of a trade-in allowance that goes toward paying off the remaining loan balance on the trade-in is not added back to the taxable price.

Buying From a Private Seller

Private-party sales work differently. For passenger vehicles and light-duty trucks, the DMV bases the tax on the higher of the NADA average trade-in value or the amount on your bill of sale.¹ This blocks buyers from writing a low number on paper to shrink the tax. Pay $18,000 for a car with a NADA trade-in value of $21,000, and you owe tax on $21,000. No trade-in credit is available on private-party transactions.

How Leases Are Taxed

When you lease, sales tax applies to each monthly lease payment rather than the full vehicle price. The standard 6.35% rate applies. The 7.75% rate does not apply to leased vehicles, even when the vehicle’s value exceeds $50,000.³

Short-term rentals of 30 consecutive days or fewer are taxed at a much steeper 9.35%.² That rate hits typical rental car transactions, not standard multi-year leases.

Buying Out of State or Moving In

If you bought a vehicle in another state and paid that state’s sales tax, Connecticut gives you credit for what you already paid. Bring your purchase invoice and the tax receipt to the DMV. If the other state’s rate was lower than Connecticut’s, you owe the difference. Without documentation, the DMV charges the full Connecticut rate.¹

New residents who already own a vehicle owe no Connecticut sales tax, provided the vehicle was registered in their name in another state for at least 30 days before they established Connecticut residency. On the Application for Registration and Title (Form H-13B), use Section 5, Code 4, and include the state where you lived when you bought the vehicle, the purchase date, the date you registered it there, and the date the vehicle first entered Connecticut.¹

Exemptions and Reduced Rates

Immediate Family Transfers

Vehicles transferred between immediate family members are exempt from sales tax. Connecticut defines immediate family as a mother, father, sister, brother, son, daughter, husband, or wife. The vehicle must have been registered in the transferring family member’s name for at least 60 days. Complete Section 7 on Form H-13B and submit a gift declaration (Form AU-463) signed by the person giving you the vehicle.⁵

Nonresident Buyers

Nonresidents who buy a vehicle in Connecticut for immediate removal from the state are exempt, provided they don’t keep a permanent home here and won’t register the vehicle in Connecticut. The buyer completes Form CERT-125 at purchase. Business buyers face tighter rules: the company must have no Connecticut presence or fixed assets in the state, and no partner, officer, or member with an ownership interest can be a Connecticut resident.⁶

Nonresident Military

Active-duty military members stationed in Connecticut who are legal residents of another state pay a reduced sales tax rate of 4.5% on vehicle purchases instead of the standard 6.35%. The reduced rate also applies to joint purchases made with a spouse.⁷

If You Pay Late

Because the tax is due at registration, delaying registration on a vehicle you’ve already bought just compounds the problem. Connecticut charges interest at 1% per month, or any fraction of a month, on unpaid sales and use tax from the original due date until you pay.⁸ On a $3,000 tax bill, that’s $30 added each month. Renewing a lapsed registration more than five days past expiration also triggers a $10 late fee at the DMV.⁹

One Tax Sales Tax Isn’t

Connecticut’s sales tax on a vehicle is a one-time cost paid at registration. It’s separate from the annual municipal property tax that every Connecticut town levies on registered motor vehicles, which arrives as its own bill (typically in July) based on the town’s mill rate and the vehicle’s assessed value. If you’re new to Connecticut, budget for both.

1
CT.gov. Learn About Sales Tax on First Time Vehicle Registrations
2
CT.gov. Sales and Use Tax Information
3
CT.gov. Use the DMV’s Vehicle Sales Tax Calculator
4
CT.gov. Taxable List for Luxury Vehicles
5
CT.gov. Transfer Car Ownership
6
State of Connecticut. Certificate of Exemption for Motor Vehicle Sales (Form CERT-125)
7
Connecticut State Department of Revenue Services. PS 2001(4) Sales of Motor Vehicles to Nonresident Military Personnel and Joint Sales of Motor Vehicles
8
Justia. Connecticut General Statutes 12-419 – Interest and Penalties
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CT.gov. Renew Your Vehicle Registration