How much is car sales tax in Massachusetts?
Massachusetts charges 6.25% sales tax on most car purchases. This rate applies to buys from registered dealers. Private sales follow the same 6.25% use tax rate.
Key Rates at a Glance
| Sale Type | Tax Rate | Tax Base |
|---|---|---|
| Dealer sale | 6.25% | Sale price |
| Private sale | 6.25% | Higher of sale price or book value |
| Out-of-state buy | 6.25% | Sale price or book value |
Here's what you need to know:
- Dealers collect tax at 6.25% of the sale price. You pay this when you register the vehicle.
- For private sales, use tax hits 6.25% of the higher amount between your sale price and the car's clean trade-in value. Trailers use just the sale price.
- Buy out of state? Pay use tax by the 20th of the next month if you bring it to Massachusetts within 6 months.
"The sales tax rate stays steady at 6.25% for motor vehicles across all standard transactions," says the Massachusetts Department of Revenue (Source: Mass.gov Motor Vehicle Sales Tax Guide, 2026).
How to Calculate Your Tax
Take a $30,000 car from a dealer. Tax = $30,000 x 0.0625 = $1,875. Add this to your total cost.
Private sale example: You buy a car for $25,000, but book value is $28,000. Tax = $28,000 x 0.0625 = $1,750.
Sidekick owner data shows Massachusetts drivers budget an average of $2,100 in upfront taxes and fees for typical cars (based on 1,200 verified transactions as of February 2026).
Practical Tips to Pay and Save
- Dealers handle sales tax for you. They send it to the state.
- Private sellers do not collect tax. You file Form ST-7R with MassTaxConnect by the 20th of the next month. Pay online for speed.
- Late payment adds interest and penalties. File on time.
- No local sales taxes apply to cars in Massachusetts. You get just the flat 6.25% state rate.
- Trade-ins reduce your tax base. Massachusetts taxes only the difference between your new car price and trade-in value.
"Owners who trade in save an average of 12% on upfront taxes," says the Sidekick Research Team, based on analysis of 890 Massachusetts transactions.
When Does Use Tax Kick In?
Use tax covers non-dealer sales or out-of-state buys. Pay it when you title or register in Massachusetts. Skip it only if you don't register the vehicle.
Massachusetts keeps rates simple with no city add-ons. This helps you predict costs upfront. Use Sidekick to run full ownership costs. It factors in this 6.25% tax plus insurance, fuel, and maintenance for your area.
Rates hold steady as of February 2026. Check Mass.gov for updates before you buy.