A Message from the Supervisor

“Welcome to Islip, the 3rd largest town in New York State, but with an endearing small town feel. We are so proud of our town…our beaches, golf courses, marinas, parks, housing opportunities for all, businesses, industrial parks, healthcare and educational institutions including our own Islip MacArthur Airport that provides many job opportunities. I sincerely hope you find this website helpful.” - Angie

The Assessor's Office is responsible for the review and approval of all real property tax exemptions which includes:

  • STAR (Basic & Enhanced)
  • Veterans
  • Senior Citizen
  • Volunteer Firefighter & Ambulance Workers
  • Disability
  • Religious & Not-for Profit
  • Home Improvement
  • Business
  • New Living Quarters for Parents/Grandparents
  • First-Time Home Buyer of a Newly Constructed Home
  • Agricultural

All applications and/or renewals for real property tax exemptions must be filed with the Assessor's Office, no later than March 1st of each year. Please direct ALL exemption questions to this department.

Assessor’s Office: (631) 224-5585
STAR Office: (631) 224-5058
Web Link: