Massachusetts registration costs depend on your vehicle's age and weight

Massachusetts charges a flat $50 registration fee for most passenger vehicles, plus an additional excise tax based on the vehicle's value. The excise tax is calculated at $25 per $1,000 of assessed value (or fraction thereof), and it applies whether you own the car outright or are financing it. A new car worth $30,000 would owe roughly $750 in excise tax on top of the $50 registration fee in its first year.

The total amount you pay depends on what the Registry of Motor Vehicles (RMV) assesses as your vehicle's value. For new cars, they use the manufacturer's list price. For used cars, they use a standard valuation guide that reflects typical market prices for that year, make, and model. You cannot negotiate the assessed value—it is set by the RMV's valuation tables.

Excise tax is due every year you own the vehicle in Massachusetts, not just at registration. The RMV bills it separately from your registration renewal, usually in the fall for the following calendar year. If you move out of state or sell the car, you may be may have access to to a refund of unused excise tax, but you must request it.

Key Takeaways

  • The base registration fee is $50, but you will also owe excise tax calculated at $25 per $1,000 of your vehicle's assessed value each year.
  • Excise tax is billed separately from registration and arrives as a separate bill in the fall, even if your registration is current.
  • The RMV uses manufacturer pricing for new vehicles and valuation guides for used vehicles; you cannot dispute the assessed value.
  • If you sell your car or move out of state partway through the excise tax year, you can request a refund for the unused portion.
  • Commercial vehicles, motorcycles, and trailers have different fee structures and are not subject to the standard passenger vehicle excise tax.

How the RMV calculates your vehicle's assessed value

For a new car, the RMV uses the manufacturer's suggested retail price (MSRP) listed on the window sticker. If you bought the car for less than MSRP, the RMV still uses the full MSRP for excise tax purposes. Dealer discounts, rebates, and negotiated prices do not lower the assessed value.

For used cars, the RMV consults the National Automobile Dealers Association (NADA) guide, which lists typical market values by year, make, model, and condition. The RMV updates these values periodically, so a car's assessed value can change from year to year even if you have not modified it. A five-year-old sedan might be assessed at $18,000 one year and $17,000 the next if the market value for that model year has declined.

You receive a bill showing the assessed value and the excise tax calculation. If you believe the value is significantly wrong—for example, if the RMV has listed your car under the wrong model year or body style—you can file a Form ST-2 (Abatement of Motor Vehicle Excise Tax) with your local assessor's office to request a review. You will need documentation such as a bill of sale, repair records, or photos showing damage or wear that would justify a lower value.

When you owe registration and excise tax

Registration fees and excise tax are due at different times. When you first register a vehicle in Massachusetts, you pay the $50 registration fee when ready. The excise tax for that first year is calculated based on when you register and is prorated if you register partway through the calendar year.

After that first year, the RMV sends you a separate excise tax bill in the fall (usually September or October) for the following calendar year. This bill is not the same as your registration renewal notice. You must pay the excise tax by December 31 of the year it is billed, or you will face a penalty. If you do not pay, the RMV can suspend your registration and your ability to renew your license plates.

Your registration itself renews on your birthday month (the month you first registered the vehicle). You can renew online, by mail, or in person at an RMV branch. Registration renewal costs the $50 fee plus whatever excise tax is due that year.

Refunds and credits if you sell or move

If you sell your vehicle or move out of Massachusetts before the excise tax year ends, you are may have access to to a refund of the unused portion. For example, if you paid excise tax for the full year but sold the car in June, you should receive a refund for the six months you did not own it in the state.

To request a refund, contact your local assessor's office (not the RMV) with proof of sale or proof of out-of-state residency. You will typically need the bill of sale, the new owner's name and address, or a lease or deed showing your new address. Processing time varies by town but usually takes four to eight weeks.

If you trade in a vehicle and when ready buy a new one, you do not automatically receive a credit toward the new car's excise tax. Each vehicle is assessed and billed separately. However, if you have paid excise tax on a vehicle you no longer own, you can still file for a refund through your assessor.

Special cases: Leased vehicles, commercial plates, and exemptions

If you lease a car in Massachusetts, the leasing company is responsible for paying the registration fee and excise tax, not you. These costs are typically built into your monthly lease payment. You will not receive a separate bill from the RMV or your assessor.

Commercial vehicles registered on commercial plates have a different fee structure. Instead of excise tax, they pay a commercial vehicle excise tax based on the vehicle's gross vehicle weight rating (GVWR). A pickup truck used for business might owe $100 to $300 per year depending on its weight, not the $25-per-$1,000 calculation used for passenger cars.

Motorcycles, mopeds, and trailers are also taxed differently. Motorcycles pay a flat excise tax (currently $25 per year) rather than the percentage-based calculation. Trailers under 3,000 pounds pay a flat fee. Some vehicles—such as those owned by the state, certain non-profit organizations, or vehicles used exclusively for agricultural purposes—may be exempt from excise tax, but you must explore for an exemption through your assessor's office.

What happens if you do not pay registration or excise tax

If you do not pay your excise tax by the December 31 important date, the RMV will add a penalty (currently 10 percent of the unpaid amount) and may suspend your vehicle registration. A suspended registration means you cannot legally drive the vehicle or renew your license plates. You also cannot pass a safety and emissions inspection (if your vehicle requires one) without a current registration.

If you receive a notice that your registration has been suspended for unpaid excise tax, you must pay the full amount owed plus the penalty to the assessor's office in your town. Once paid, the RMV will reinstate your registration, but this can take a few business days. Driving with a suspended registration can result in a fine and points on your driving record.

If you believe you owe excise tax in error—for example, because you sold the vehicle and the assessor did not receive notice—contact your local assessor when ready with proof. Providing documentation quickly can prevent a suspension and may reduce or eliminate penalties if the error was not your fault.

Frequently Asked Questions

Can I deduct Massachusetts excise tax from my federal income taxes?

No. Federal tax law does not allow a deduction for state excise taxes on vehicles. You can deduct state income tax or state sales tax (up to a limit), but not excise tax. Consult a tax professional if you are unsure how your specific situation applies.

Why did my excise tax bill go up even though I did not buy a new car?

The RMV updates its valuation guides annually, and used car values can shift based on market conditions. If your car's model year became more desirable or if the RMV corrected a valuation error, your assessed value may increase. You can request a review through Form ST-2 if you believe the increase is unjustified.

Do I have to pay excise tax if I only drive my car a few months a year?

Yes. Excise tax is based on ownership during the calendar year, not on how much you drive. If you own the vehicle on January 1, you owe excise tax for the full year. If you sell it before the year ends, you can request a refund for the unused months.

What if I buy a used car from out of state and register it in Massachusetts?

You will owe the $50 registration fee plus excise tax based on the RMV's assessed value of that vehicle. The assessed value is determined by the NADA guide, not by what you paid for it. If you paid significantly less than the guide value, you can file Form ST-2 with your assessor to request a review, but you will need documentation of the actual purchase price.

Can I pay my excise tax online?

Payment methods vary by town. Some assessor's offices accept online payments through their websites; others require payment by mail or in person. Contact your local assessor's office to find out how to pay. The RMV website lists assessor contact information by town.