Sullivan County, New YorkProperty records & tax offices
Links open the listed public-office or service-provider website in a new tab. This directory does not collect payments.
Find the right property record
Use the property portal for ownership and assessed value, the collector for a bill or balance, and the map for parcel location. Have the address, owner name, or parcel number ready.
Tax bills & filing dates
These are the dates and qualifications recorded in the directory. Confirm your tax year and current deadline with the official office and your property’s notice.
- Payment deadline
- 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.
- Assessment appeal
- 2026 assessment complaints are filed with the applicable municipal Board of Assessment Review by that municipality's Grievance Day; countywide date not published.
Exemptions & appeals
View exemption application (opens in a new tab)Exemption filing
March 1, 2026 taxable-status date for most New York exemption applications; confirm with the local assessor.
Senior relief
New York senior-citizen exemption (RPTL §467) is locally adopted; qualifying owners are generally age 65+ and subject to the income limit set by the county, city, town, village, or school district, with up to a 50% assessed-value reduction. Basic and Enhanced STAR provide school-tax relief; new applicants register for the STAR credit with NYS, while Enhanced STAR is for eligible owners age 65+ subject to the current income limit. Confirm the local scale with the municipal assessor.
Valuation limits
No general countywide assessed-value cap verified. New York requires annual assessment at a uniform percentage of market value; the New York property-tax cap limits annual tax-levy growth (generally 2% or inflation, with exceptions), not an individual parcel's assessed value.
For a valuation appeal, use the appeal date in the tax and filing section above. Keep your notice, supporting evidence, and proof of submission.
More exemption & appeal guidance →