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**ALERT** U.S. Postal Service Error Causes Some “Undeliverable” Tax Payments. Click here to read more.

From the Receiver of Taxes:

On January 17 2024, Andy Wittman, the Receiver of Taxes for the Town of Islip became aware of a “scanning machine error” at the United States Postal Service (USPS) Mid-Island Processing and Distribution Center in Melville, NY. This error has caused several tax envelopes containing payments to be returned to the sender as “undeliverable.”

Property tax payments for the Town of Islip, and all of Suffolk County, are due on or before January 10, 2024 in order to avoid penalty. Do not discard the returned envelope, as its postmark serves as proof of a timely payment.

Residents who have received their envelopes returned to them are encouraged to contact the Tax Receivers office at 631-224-5580 immediately.

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 2023-2024 Assessment Roll and Warrant. He will accept payment of taxes by mail or at his office beginning Monday, December 11, 2023. Online payments begin Monday, December 11, 2023, starting at 10am., please visit The tax bills are being mailed out the week of December 11, 2023.

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

Office Closed:

  • Monday, May 27, 2024 in observance of Memorial Day

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*