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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

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Documents

pdf 2021-2022 Final Assessment Roll Popular

Download (pdf, 19.02 MB)

2021_2022_Final_Asmnt_Roll_ASXBP912.pdf

pdf 2021-2022 Tentative Assessment Roll Popular

Download (pdf, 16.82 MB)

2021_2022_TENT_ASMNT_ROLL_ASXBP912.pdf

pdf 2022-2023 Final Assessment Roll Popular

Download (pdf, 19.01 MB)

2022-2023 Final Assessment Roll.pdf

pdf 2022/2023 Tentative Assessment Roll Popular

Download (pdf, 16.80 MB)

2022_2023_Tent_Asmnt_Roll_ASXBP912.pdf

pdf 2023-2024 Final Assessment Roll Popular

Download (pdf, 16.82 MB)

2023_2024_FINAL_ASMNT_ROLL_ASXBP912.pdf

default 2023-2024 Tentative Assessment Roll Popular

Download (pdf, 16.84 MB)

2023_2024_TENT_ASMNT_ROLL_ASXBP912.pdf

pdf 2024-2025 Final Assessment Roll Popular

Download (pdf, 19.07 MB)

2024_2025_FINAL_ASMNT_ROLL_SECURED.pdf

pdf 2024-2025 Tentative Assessment Roll Popular

Download (pdf, 19.10 MB)

2024_2025_TENT_ASMNT_ROLL_ASXBP912.pdf

pdf Commercial Assessment Estimate Request Form Popular

Download (pdf, 718 KB)

Commercial Assessment Estimate Request Form.pdf

pdf FORM RP-467-Renewal Popular

Download (pdf, 508 KB)

RP-467 Renewal Application Filer Web Version.pdf

pdf Residential Assessment Estimate Request Form Popular

Download (pdf, 99 KB)

Residential Assessment Estimate Request Form.pdf

pdf RP-421-F: Residential Capital Improvement Popular

Download (pdf, 54 KB)

RP-421-F_Residential_Capital_Improvement_and_instructions.pdf

pdf RP-425-Wkst: Income for STAR Purposes Worksheet Popular

Download (pdf, 335 KB)

rp425worksheet_fill_in - 25-26.pdf

RP-425-Wkst: Income for STAR Purposes Worksheet

TO BE USED BY INDIVIDUALS NOT REQUIRED TO FILE A FEDERAL OR NEW YORK STATE INCOME TAX RETURN

pdf RP-425–IVP: Supplement to Form RP-425–E Popular

Download (pdf, 709 KB)

rp425ivp_fill_in 25-26.pdf

RP-425–IVP: Supplement to Form RP-425–E

MANDATORY FOR ALL ENHANCED STAR APPLICANTS

pdf RP-457: First Time Homebuyer - New Construction Popular

Download (pdf, 53 KB)

RP-457_First_Time_Homebuyer_-_New_Construction_and_instructions.pdf