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Sullivan County, New York property-tax payment and appeal deadlines

Tax bills, payment rules, and valuation-review windows are controlled by the local jurisdiction and the governing state framework. The reviewed record below separates published figures from items that still require confirmation with Sullivan County Real Property Tax Services Agency.

2 of 4 timeline fields publishedCollector route: sullivanny.govIndividual source checks not yet recorded

Rate context

Confirm

Not published in the reviewed official sources.

Statement mailing

Confirm

Not published in the reviewed official sources.

Payment deadline

Published

2026 county schedule verified: tentative assessment rolls as of May 1, 2026 and final rolls as of July 1, 2026; tax collection and payment dates vary by town, village, and school district. Sullivan County Treasurer collects delinquent 2026 and earlier county/town taxes.

Valuation protest

Published

2026 assessment complaints are filed with the applicable municipal Board of Assessment Review by that municipality's Grievance Day; countywide date not published.

Do not assume a grace period.

The reviewed record identifies the payment timing above but does not establish a universal penalty schedule for this page. Late charges, interest, collection costs, tax-sale procedures, and lien or foreclosure timelines can depend on state law and the local collector’s process. If the deadline is close or a balance is delinquent, contact the tax collector directly and request the current payoff amount in writing.

Treat a published payment deadline as a hard operational date and retain your receipt or confirmation number.

From assessment to collection

01Valuation and notice

Review the assessment notice as soon as it arrives. The protest window may run from the notice date rather than from the payment due date.

02Statement and account review

Match the tax statement to the parcel or account number and confirm exemptions, assessed value, taxing units, credits, and balance.

03Payment confirmation

Use the official collector channel, then save the receipt, transaction reference, and date posted. A bank submission is not always the same as a county posting date.