Welcome to the Town of Islip Receiver of Taxes homepage. This site has been completely revamped to give taxpayers a more user-friendly experience when inquiring about property taxes.
NOTICE IS HEREBY GIVEN TO THE TAXPAYERS OF THE TOWN OF ISLIP; that Andy Wittman, the Receiver of Taxes has received the 2024-2025 Assessment Roll and Warrant. He will accept payment of taxes by mail or at his office beginning Monday, December 8, 2025. Online payments begin Monday, December 8, 2025, starting at 10am., please visit https://Tax.IslipNY.gov. The tax bills are being mailed out the week of December 8, 2025.
Due Dates:
NOTICE IS HEREBY GIVEN TO THE TAXPAYERS OF THE TOWN OF ISLIP; that Andy Wittman, the Receiver of Taxes has received the 2024-2025 Assessment Roll and Warrant. He will accept payment of taxes by mail or at his office beginning Monday, December 8, 2025. Online payments begin Monday, December 8, 2025, starting at 10am., please visit https://Tax.IslipNY.gov. The tax bills are being mailed out the week of December 8, 2025.
Due Dates:
- 1st half taxes are due on/before January 10, 2026
- 2nd half taxes are due on/before May 31, 2026
Office Closed:
- Wednesday, December 24, 2025, in observance of Christmas Eve
- Thursday, December 25, 2025, in observance of Christmas Day
- Wednesday, December 31, 2025, in observance of New Years Eve PLEASE NOTE New Years Eve (12/31/25) is no longer a half day
- Thursday, January 1, 2025, in observance of New Years Day
Special Dates/Hours:
- Monday, January 12, 2026 – (8:30am – 7:00pm)
- Monday, June 1, 2026 – (8:30am – 7:00pm)
***THE 2025-2026 TAX BILL WILL BE MAILED TO THE ADDRESS ON FILE ON OR ABOUT DECEMBER 8, 2025*** You will not receive a bill in December if your property taxes are escrowed through your financial institution.
| TAXES SUBMITTED | LATE PENALTY |
|---|---|
| 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 |
- After May 31st, any taxes plus penalty and interest must be paid to the Suffolk County Comptroller’s office, located at 330 Center Drive Riverhead, NY 11901. (631) 852-3000.
*Taxes become a lien on December 1st of each year*
