All Massachusetts residents who own and register a motor vehicle must pay an annual motor vehicle excise. The excise is levied by the city or town where the vehicle is principally garaged and the revenues become part of the local community treasury.
The State of Massachusetts Department of Revenue (DOR) has more information about the definition of "motor vehicle", how the tax is calculated, and exemptions to the motor vehicle excise tax on their website.
If you'd like to file for an abatement, fill out the form on the DOR Motor Vehicle Excise site and return it to the Wellesley Assessor's Office at: Assessor@Wellesleyma.gov.