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Suffolk County · Islip Terrace, NYIslip Terrace, NY property taxes. Values held. Know when to push back.
The typical home in Islip Terrace was worth about $663,000 in January 2026, up 4.5% from a year earlier. In a steady market, a grievance works best for specific homes whose assessment ran ahead of what they'd sell for.
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What Islip Terrace home values did
Islip Terrace values rose 4.5% in the year to January 2026, reaching a new high. That's stronger than Suffolk County as a whole (+2.7%).
Since January, values have risen 2.0% through August 2026.
| Month | Typical value | vs. a year earlier |
|---|---|---|
| January 2021 | $497,000 | +6.1% |
| January 2022 | $544,000 | +9.3% |
| January 2023 | $557,000 | +2.5% |
| January 2024 | $600,000 | +7.7% |
| January 2025 | $635,000 | +5.8% |
| January 2026 | $663,000 | +4.5% |
| August 2026 (latest) | $677,000 | +2.0% since January |
January 2026 was the highest month since 2021.
What to check on your notice
The typical Islip Terrace home gained 4.5% in the year to January 2026. A notice that rose far more than that, or a value above what similar homes nearby actually sold for, is the usual starting point for a grievance.
How Islip Terrace compares nearby
Among 10 Suffolk County places, Islip Terrace has the 10th largest drop from its peak and the 4th highest typical value. Statewide, its 1-year change ranks 402nd of 595 New York places, from weakest to strongest.
| Place | January 2026 | 1-year change | vs. peak |
|---|---|---|---|
| Brentwood | $630,000 | +4.9% | At peak |
| Lindenhurst | $661,000 | +0.7% | At peak |
| Patchogue | $590,000 | +2.8% | At peak |
| West Babylon | $672,000 | +0.7% | At peak |
| Ronkonkoma | $637,000 | +4.3% | At peak |
| Central Islip | $576,000 | +5.0% | At peak |
| Bay Shore | $658,000 | +2.1% | At peak |
| Huntington Station | $669,000 | +1.6% | -0.7% |
| Farmingdale | $715,000 | +4.2% | At peak |
| Islip Terrace | $663,000 | +4.5% | At peak |
Deadline and where to file
Islip Terrace values are set by the local town or city assessor. Most towns and cities: file Form RP-524 by Grievance Day, usually the fourth Tuesday in May. Exceptions: Suffolk towns meet the third Tuesday in May, Westchester towns the third Tuesday in June, villages that assess typically the third Tuesday in February, and some shared-assessor towns pick a date between the fourth Tuesday in May and the second Tuesday in June. NYC: March 15 for Class 1 homes and March 1 for all other classes. Nassau County: March 1.
Reading this in fall 2026? The 2026 Grievance Day has passed in nearly every community, and the 30-day window to file SCAR after the final roll has too. Your next chance is for the 2027 roll, and it depends on where you live. Based on the usual rules (dates not yet confirmed for 2027), villages that assess may meet around February 16, 2027, NYC and Nassau deadlines are around March 1 (NYC Class 1 around March 15), most towns and cities around May 25, Suffolk towns around May 18, and Westchester towns around June 15. Call your assessor to confirm, because missing Grievance Day forfeits both the board hearing and judicial review for that year.
The Suffolk County guide covers the full New York grievance process: forms, fees, hearing levels and what happens next.
Building a Islip Terrace case
Averages explain why a case might work. The decision turns on evidence about one property. Islip Terrace is part of the New York-Newark-Jersey City metro, but your evidence should be local. Sales a few streets away usually beat sales across the metro.
- In NYC, foreclosure sales and family sales are not accepted as proof of market value.
Get your Islip Terrace appeal report
Start with your address. Vulorean checks your assessment against recent comparable sales and builds a value report you can bring to your New York grievance. Eligible reports are free during launch; an account is required and local filing fees are separate.
Check my property and get a report →Vulorean was built for California first. New York forms, deadlines and filing rules vary, so confirm them with your local office before filing. If something in your report looks wrong, email support@vulorean.com and we'll get it fixed.
Home values: Zillow Home Value Index (ZHVI), all homes, mid-tier, smoothed and seasonally adjusted, through August 2026, from Zillow Research. Rules: NY Tax Department: Contesting Your Assessment in New York State, NY Tax Department: Property tax calendar, NY Tax Department: Grievance procedures, NY Tax Department: Contest your assessment. Vulorean is an independent service, not a government office. Confirm dates and forms with your local office.