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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 available to assist you in any way possible with their assessment policies and procedures. Due to the Novel Coronavirus (COVID-19) Pandemic and a recent Executive Order issued by the Governor, and adopted by the Town of Islip Town Board, the following revised dates apply for the 2020/21 assessment cycle:




Tentative Assessment Roll

Grievance Complaint

COVID-19 Certification


Change in Assessment Notices

On or before June 1, 2020, our office will mail change in assessment notices for all properties that experienced an increase or decrease in assessment. Our staff is available to answer all inquiries pertaining to such notices.

Publication and Inspection of the Tentative Assessment Roll

The Tentative Assessment Roll will be finalized on or before June 1, 2020, and will be available for inspection on this website. An individual property search is also available to check the assessment of a specific property. In the event that that the Assessor’s Office remains closed to the public, inspection of the printed Tentative Assessment Roll will be available by appointment only between the hours of 8:30 a.m. to 4:00 p.m., Monday through Friday. Please call (631) 224-5585, to arrange for an appointment -- provide your full name, address, and contact information. If you appear in person, you will be required to certify in writing that you have not had COVID-19 exposure within the prior fourteen-day period. Print out the COVID-19 Certification, fill it out the day of your appointment and bring it with you. Call to inform us of your arrival, and our staff will provide you with further instructions. Also, face coverings are mandatory and you must adhere to all “social distancing” requirements.

Filing of Grievance Complaints

Should you wish to challenge your assessment, you may file a Grievance Complaint with the Assessor’s Office as soon as the Tentative Assessment Roll is finalized. Any Grievance Complaint that is not received by the Assessor’s Office by 9:00 p.m. on Grievance Day, Tuesday, June 30, 2020, will be dismissed by the Board of Assessment Review (BAR) as untimely.

From the date of publication of the Tentative Assessment Roll, you may mail a Grievance Complaint to:

Town of Islip Assessor’s Office
40 Nassau Avenue
Islip, NY 11751

In order to be timely, any Grievance mailed must be received by the Assessor’s Office no later than 9:00 p.m. on June 30, 2020.

A DROP BOX will be available on business days and Grievance Day from 8:30 a.m. to 4:00 p.m. in the lobby of our building at the street entrance on 40 Nassau Avenue, Islip (not the entrance used to pay taxes). In addition to providing your original Grievance Complaint, a self-addressed and stamped envelope is appreciated to mail back your complaint number. If you also provide a copy of your Grievance Complaint, your copy will be date stamped and mailed back to you with your Complaint Number. By appointment only, you may hand-deliver your Grievance Complaint to Suite 3 of the Assessor's Office located at 40 Nassau Avenue, Islip, New York, between the hours of 8:30 a.m. to 4:00 p.m., Monday through Friday. To arrange for an appointment, please call (631) 244-5585 -- provide your full name, physical property address, and contact information. If you appear in person, you will be required to certify in writing that you have not had COVID-19 exposure within the prior fourteen-day period. Print out the attached COVID-19 Certification, fill it out the day of your appointment and bring it with you. Call to inform us of your arrival, and our staff will provide you with further instructions. Also, face coverings are mandatory and you must adhere to all “social distancing” requirements.

On Grievance Day, Tuesday, June 30, 2020, you may hand-deliver your Grievance Complaint to Suite 3 of the Assessor’s Office located at 40 Nassau Avenue, Islip, New York, between the hours of 8:30 a.m. and 9:00 p.m. You should expect the possibility of lengthy delays. You will be asked to sign-in with your full name, physical property address, and contact information. If you appear in person, you will be required to certify in writing that you have not had COVID-19 exposure within the prior fourteen-day period: COVID-19 Certification Document. Also, face coverings are mandatory and you must adhere to all “social distancing” requirements.

Grievance Day Hearings

On Grievance Day, June 30, 2020, the Board of Assessment Review (BAR) will meet to hear any complaints in the auditorium at 401 Main Street, Islip, New York. All Grievance Complaints will be reviewed in detail by the BAR -- appearance by the taxpayer is not required to file a Grievance Complaint or to have it reviewed. All taxpayers who wish to be heard on their Grievance Complaint may either appear in person (instructions below) or participate in a ZOOM Webinar Grievance Hearing on June 30, 2020 during the following times: Zoom link and dial-in details provided here when available. You do not need internet access to participate -- you may dial-in by phone. A moderator will ensure your participation at the hearing when it is your turn to be heard. If you would like the Board to review any documentation other than the Grievance Complaint Form (i.e. pictures), please be sure to provide them in advance of the hearing. The Grievance Day Hearing will be available for streaming on the Town of Islip website at this link when available. If you have technical difficulties, please contact my office at 631-224-5585.

If you wish to be heard on your Grievance Complaint in person, you must sign-in with your full name, Complaint No. (obtained from the Assessor’s Office when you filed your Grievance Complaint), physical property address, and contact information. If you appear in person, you will be required to certify that you have not had COVID-19 exposure within the prior fourteen-day period: COVID-19 Certification Document. Also, face coverings are mandatory and you must adhere to all “social distancing” requirements.

Board of Assessment Review Determinations

On or about August 1, 2020, the BAR will issue determination letters for all Grievance Complaints.


General Information

Informal Assessment Review

Please keep in mind, not only is our staff available to answer your assessment and exemption inquiries, our office is available for informal assessment reviews prior to March 1st of any tax year, well in advance of Grievance Day. The Assessor must value real property as of July 1st of the year prior to Grievance Day. The Assessor must also value the real property in its condition and use as of March 1st immediately prior to Grievance Day. Upon written request, if the property owner wishes to share sufficient proof of the market value of their property, our office will consider such proof prior to setting the tentative assessment for the property for the upcoming tax year. For example, an appraisal prepared for refinancing purposes and a valuation date within one year of the July 1st valuation date may be useful in a request for an informal assessment review. Likewise, an "arm's-length" sale of the subject property close to the July 1st valuation date may suggest a lower assessment.

Assessment Estimates

Upon written request, our office also provides property owners with assessment estimates, in advance of a property owner adding inventory to their real property (e.g., adding an in-ground pool, a bathroom or an addition). Such assessment estimate request forms are available for residential and commercial properties. The assessment estimate is good for one year, and is valid for the improvements contained in the assessment estimate form.

We look forward to assisting you.



Visit the Assessor's Office homepage at https://islipny.gov/departments/assessor for more information.

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