I Want to Grieve My Brookhaven Assessment. Can I File Online?
Yes. The Town of Brookhaven provides an online grievance application for homeowners who want to challenge their assessment. For the 2026 assessment cycle, Brookhaven opened online grievance filing on May 1, 2026 and accepted submissions through May 19, 2026, which was Grievance Day that year. Supporting documents can also be attached through the online system.
Can I File Whenever I Want?
No. Brookhaven says grievance applications and supporting documents must be submitted during the official grievance period. For 2026, anything submitted before May 1 or after May 19 was returned. Property assessment grievances are not something homeowners can simply submit in December because they dislike the new tax bill.
What Is the Board of Assessment Review?
Brookhaven has a local Board of Assessment Review. The Board reviews grievance complaints filed between May 1 and Grievance Day and determines, based on the evidence presented, whether a reduction in assessed value is justified. After deliberation, the Board sends its decision to the homeowner or designated representative.
Do I Have to File Online?
Brookhaven strongly encourages online filing, but it also lists alternative filing methods. For the 2026 cycle, homeowners could submit by mail or deliver materials to Town Hall, provided they met the deadline requirements.
What Should I Do Before the Filing Period?
Before May, review your assessment, property inventory, square footage, market-value estimate, exemptions, comparable properties and other relevant evidence. The Town's interactive assessment system makes it possible to begin reviewing the property before the formal filing window opens.
Conclusion
Brookhaven homeowners can file an assessment grievance online, but timing matters. The filing window begins when the Tentative Assessment Roll is released and ends on Grievance Day.
AIDOTAX helps New York homeowners understand their assessment and organize information before the grievance process.