Property tax in Shelter Island is collected by the Receiver of Taxes on a schedule set by NY State law and county code. Here are the 2026 due dates, what gets billed when, and what happens if you pay late.
| Bill | Mailed | Due (penalty-free) | After |
|---|---|---|---|
| Combined bill (school + general), 1st half | Dec 2025 | Jan 10, 2026 | 1% penalty after Jan 10; 2% after Feb 10 |
| Combined bill, 2nd half | May 1, 2026 | May 31, 2026 | 5% penalty + 1%/mo interest (from Feb 1) after May 31 |
Suffolk's penalty math compounds aggressively. After the May 31 deadline, a 5% penalty plus 1%/month interest applies (calculated from February 1, not May 31). A $10,000 bill paid in December can grow by $1,100+ in extra charges. Unpaid bills proceed to tax-sale by the County the following November.
If escrowed, your lender pays both halves. Direct-pay homeowners should mark both June 1 (after the May 31 deadline) and December 6 (after Dec 5 second-half) as critical dates.
No. The cycle dates are set by NY State law and Nassau / Suffolk County code. The year on the bill changes, but the calendar dates stay the same.
Penalties accrue against the property, not the lender. Contact your servicer immediately and demand they make the payment plus penalty. They are legally required to escrow correctly.
At closing, the title company prorates property tax between buyer and seller through closing date. The seller pays for the period they owned; you pay for the rest. After closing, the bill is in your name.
Some receivers accept advance payment. Federal SALT-deduction caps may limit the tax benefit. Consult a CPA.
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Subscribe →Last verified: 2026-05-11. Tax rules change; we re-verify each page quarterly.
Estimates and educational content only — not legal, tax, or financial advice. Verify with your county or town receiver, an attorney, or a CPA before making financial decisions.