Massachusetts car sales tax: 6.25% and what it applies to

• Massachusetts charges 6.25%, and that rate is the same everywhere in the state — no county or city adds to it on a vehicle purchase.

• Taxed on top of the vehicle price: the dealer doc fee and dealer-installed accessories.
• Not part of the taxable amount: extended warranties and service contracts.
• Your trade-in comes off before tax is calculated.

• Massachusetts sales tax is 6.25%, flat statewide. There is no city or county add-on u2014 the local-option taxes you may have heard about apply to restaurant meals and hotel rooms, not vehicles.
• Massachusetts has a reputation for taxing cars on book value. That rule is real but applies only to private-party sales: when you buy from a dealer registered with the Massachusetts DOR, tax is calculated on the price you actually negotiated.
• Your trade-in reduces the taxable amount with no dollar cap, on new and used purchases alike u2014 but only at a Massachusetts-registered dealer. A private trade gets no credit at all.
• Buying from an out-of-state dealer that is not registered with Massachusetts DOR is the expensive case: you lose the trade-in credit AND get taxed on the higher of your price or book value.
• A manufacturer rebate lowers your taxable amount when it is applied at the time of sale. A rebate you receive by mail afterward does not, and you cannot claim the tax back later.
• The doc fee is taxable and is not capped. Separately, the dealer's charge for getting your title is capped at $5 by law, which is why you will usually see two paperwork lines.
• Extended warranties and service contracts are not taxed in Massachusetts.
• One quirk worth knowing: Massachusetts law forbids the dealer from collecting the sales tax. You owe it to the Registry, and paying it is a precondition of getting registered u2014 though in practice the dealer prepares the paperwork and remits it for you electronically. You remain responsible for making sure it was actually paid.

Source: Mass. DOR — Motor Vehicle and Trailer Sales and Use Tax; MGL c.64H/c.64I; RMV fee schedule · rules last verified Oct 1, 2026. Methodology.