Middlesex County Online Filing Portal
The Municipal Boards of Assessors (Middlesex County has no county assessor — assessment and abatement are handled by each city's or town's Board of Assessors under G.L. c.59) online portal allows homeowners to file their abatement and view settlement offers.
How to Access the Portal
- Find your account number and PIN on your assessment notice
- Visit the Municipal Boards of Assessors (Middlesex County has no county assessor — assessment and abatement are handled by each city's or town's Board of Assessors under G.L. c.59) portal
- Create an account or log in using your account number
- File your abatement and upload evidence
- Monitor for informal settlement offers