Town Square







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


Payments can be made by check/money order ONLY.

  • Make checks/money orders payable to:
    Andy Wittman, Receiver of Taxes.

  • Mail payments to:
    40 Nassau Avenue, Islip NY 11751.
Envelopes must be postmarked by the due dates of January 10th for the first half of your taxes and by May 31st for the second half of your taxes. Please refer to chart below for penalty schedule.

December 1st – January 10th No Penalty
After January 10th 1% Penalty
After February 10th 2% Penalty
After March 10th 3% Penalty
After April 10th 4% Penalty
May 11th to May 31st 5% Penalty

Important information when paying by mail:

  1. Always include a daytime phone number and item number on your check.

  2. NO METERED POSTAGE is acceptable proof of on-time payment.

  3. No vending machine or online postage will be accepted without a USPS postmark.

  4. Using a online stamp site or vending machine stamp will not guarantee an official USPS Postmark on an envelope.