Maine Vehicle Sales Tax: Rate, Trade-In Rules, and Exemptions

Maine vehicle sales tax is a flat 5.5% of the purchase price, charged once when you buy the vehicle or first register it in the state. The rate is the same everywhere in Maine. No city or county adds anything on top.¹ If a Maine dealer sells you the car, the dealer collects the tax. If you buy from a private seller or from a dealer outside Maine, you pay the same 5.5% as a use tax when you register the vehicle, and the Secretary of State will not process the registration until it’s paid.²

What Price the 5.5% Is Applied To

The tax is calculated on the sale price, and two adjustments change that number in ways worth understanding before you sign.

Trade-Ins Reduce the Taxable Amount

When you trade a vehicle in toward a new purchase, Maine taxes only the difference. Buy a $30,000 car with a $10,000 trade-in and you pay 5.5% on $20,000, which saves $550.³ The trade-in has to be in the same category as what you’re buying (motor vehicle for motor vehicle, watercraft for watercraft).

If your trade-in is worth less than what you still owe on it, that negative equity doesn’t change the taxable price either way. The allowance is based on the vehicle’s current value, not the loan balance.

Manufacturer Rebates Do Not Reduce the Tax; Dealer Discounts Do

A manufacturer rebate does not lower the taxable sale price, even if you sign it over to the dealer as part of your down payment. Maine Revenue Services treats the full pre-rebate price as the sale price.⁴ A dealer discount is different: when the dealer voluntarily marks the price down, that reduction comes off the taxable amount. A $2,000 manufacturer rebate saves nothing on tax. A $2,000 dealer discount saves $110.

Buying From a Private Seller

A private-party sale doesn’t skip the tax. Maine imposes a use tax on “casual sales” of motor vehicles, meaning any sale where the seller isn’t a licensed dealer.⁵ You pay the 5.5% at your town office or a Bureau of Motor Vehicles branch when you register the vehicle.

Bring a signed bill of sale showing the purchase price, the vehicle identification number, the odometer reading, and both parties’ signatures.⁶ Report an accurate price. Maine Revenue Services can challenge a reported price that looks low against the vehicle’s fair market value.

Buying Out of State

If you buy a vehicle outside Maine and bring it into the state, you owe the same 5.5% as use tax. The Secretary of State’s office collects it at registration.² You’ll either need proof that another state’s dealer already collected Maine sales tax, or you’ll sign a use tax certificate and pay the amount due before your registration is issued.

Exemptions Worth Knowing

The exemptions are narrower than most people expect. A few situations that come up often:

Gifts, But Only True Gifts

A genuine gift isn’t a sale, so no tax is owed. The recipient must pay absolutely nothing, including any assumed debt. If a parent gives a car to an adult child and the child takes over the remaining loan, Maine treats the assumed loan balance as consideration and taxes the transfer as a casual sale.⁵ A car “gifted” with a $5,000 loan still attached generates a use tax bill on that $5,000.

Transfers Between Spouses and Co-Owners

Buying out a co-owner’s share, even a spouse’s, is a taxable casual sale. The one clear exception is a transfer of equity between spouses ordered as part of a divorce decree, which is not taxable.⁵

Nonprofit Organizations

Beginning January 1, 2025, any organization with IRS 501(c)(3) status qualifies for a sales tax exemption on purchases (including vehicles) used primarily for the organization’s exempt purposes.⁷ Older, narrower exemptions still cover incorporated nonprofit hospitals, schools, churches, fire departments, and ambulance services. A valid exemption certificate has to be presented at the point of sale.

Nonresident Buyers

A nonresident who buys a motor vehicle in Maine and drives or transports it out of state immediately upon delivery is exempt under Section 1760(23-C).⁴ The catch: if the vehicle is registered for use in Maine within 12 months of purchase, the buyer owes use tax based on the original purchase price.

How and Where to Pay

If you buy from a licensed Maine dealer, the dealer collects the 5.5% at the sale and remits it to the state. You don’t handle the sales tax yourself at registration.²

For private sales and out-of-state purchases where Maine tax wasn’t collected, you pay at registration. You can register at your local municipal office, which often handles registration in one stop, or at a BMV branch. Bring the signed bill of sale, the vehicle’s title, and proof of insurance. Staff will have you complete a use tax certificate, calculate what’s owed, and collect payment before issuing the registration. Most offices take cash, checks, and major credit cards, though some charge a flat processing fee for card payments. Call ahead if that matters to your budget.

Penalties for Underreporting the Price

Writing a lower price on the bill of sale to shrink the tax bill is the oldest trick in private car sales, and Maine’s penalties are structured to make it a bad bet. Under Title 36, Section 187-B, the consequences depend on intent:⁸

Substantial understatement with no intent (understatement exceeds 10% of the total tax due or $1,000, whichever is greater): 1% of the underpaid amount per month, up to 25%.
Negligence or intentional disregard: 25% of the underpaid portion, or $25, whichever is greater.
Fraud with intent to evade: 75% of the underpaid portion, or $75, whichever is greater.

These stack on top of the unpaid tax and interest. Maine Revenue Services compares reported prices against standard valuation data, and a suspiciously low number on an otherwise ordinary sale is what draws a closer look.

The Annual Excise Tax Is Separate

One thing to know before you get to the town office: the 5.5% sales or use tax is a one-time charge. Maine also imposes a separate annual excise tax on every registered vehicle, based on the manufacturer’s suggested retail price and the vehicle’s age, and you pay it locally each time you register or renew.⁹ It’s a different tax with a different formula, so budget for it in addition to the 5.5%.

1
Maine State Legislature. Maine Code 36 – Sales Tax
2
Maine Legislature. Maine Code Title 29-A 409 – Collection of Taxes
3
Maine State Legislature. Maine Revised Statutes Title 36 Section 1765 – Trade-in Credit
4
Maine Revenue Services. Maine Revenue Services Instructional Bulletin No. 24 Vehicle Dealers
5
Maine Revenue Services. Maine Revenue Services Instructional Bulletin No. 42 – Registration of Vehicles – Taxable/Exempt
6
Maine.gov. Motor Vehicle Bill of Sale
7
Maine Legislature. Maine Code Title 36 1760 – Exemptions
8
Maine State Legislature. Maine Code Title 36 187-B – Penalties
9
Maine Revenue Services. Excise Tax