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.

The 2023-2024 tax bills are currently being prepared and no information will be available until early to mid-December 2023. Please be advised that the tax bills are mailed out around the 2nd week of December. If you are the property owner and would like to be notified as soon as the tax bills become available, please sign up for email notifications on our website at

Please see the information below regarding the 2023-2024 tax year.

Office Closed:

  • Friday, December 22, 2023 in observance of Christmas Eve
  • Monday, December 25, 2023 in observance of Christmas Day
  • Monday, January 1, 2024 in observance of New Year’s Day

Half Day:

  • Friday, December 29, 2023 in observance of New Year’s Eve – (8:30am – 12 noon)

Special Dates/Hours:

  • Wednesday, January 10, 2024 – (8:30am – 7:00pm)
  • Friday, May 31, 2024 – (8:30am – 7:00pm)
The office is closed on Saturday, Sunday and holidays.

***THE 2023-2024 TAX BILL WILL BE MAILED TO THE ADDRESS ON FILE ON OR ABOUT DECEMBER 11, 2023*** You will not receive a bill in December if your property taxes are escrowed through your financial institution.

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*