Chapter 14. Online Transactions I Pay Tax Program You can use the I-Pay-Tax program to report someone who may be evading taxes by registering their vehicle in another state. To file a compliant, you will need to provide the following information: * Plate Number * State of Registration * Description of Vehicle * Address where vehicle is located * Description of any activity leading you to believe the vehicle is improperly registered. These complaints are filed online only by clicking here. Next Step - Notification to customer A letter is mailed to the Massachusetts address that appears on the complaint form and to the out-of-state address obtained from the Criminal Justice Information System. The customer has 20 days to respond/comply. If information is not provided to I-Pay-Tax Compliance within 20 days, the RMV will schedule a formal hearing for the customer, and a hearing notice will be sent to the customer. 09/20https://www.mass.gov/how-to/file-a-complaint-with-the-i-pay-tax-program