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Taxpayer Information

Unpaid Taxes
All unpaid taxes are collected by the county treasurer (except properties within the City of Fulton). Please direct all questions concerning the current amount due, interest/penalties, or payment plans to the County Treasurer's Office.

Your local assessor sets all assessments within their municipality and approves all applications for exemptions. No county office provides these services.

Online Resources
  • Assessment roll information for every property in Oswego County is available online via the Oswego County Imagemate web site.
  • Various online maps are published by Oswego County to allow better visualization of property boundaries, district information, tax maps, and other geographic data.
  • All school districts and some towns/villages have their tax records online.
  • Delinquent taxes are also online via the county treasurer.

All deeds and surveys are filed with the Oswego County Clerk's office and you may obtain copies from them for a small fee. If you are filing a subdivision (including splitting any property into one or more piece) you will need to file a copy of that map with our office first before filing it with the Clerk. The tax mapper does not keep any surveys on file.

Tax Collection Periods
All property taxes are collected locally by the town, city, village, or school tax collector. Collection periods can vary by municipality, but in general they are:
  • County taxes: January - March
  • Village taxes: June - October
  • School taxes: September - October
Except in the City of Fulton, all unpaid taxes are returned to the County Treasurer for collection at the expiration of their period. Unpaid school or village taxes will be re-levied in December onto the January county tax bill and can no longer be paid separately.

Tax Enforcement
All property taxes, once levied, become a lien upon the property and remain a lien until they are paid. The county will pursue Article 11 tax foreclosure proceedings on all taxes that remain unpaid two years after being issued (four years for agricultural properties). All properties foreclosed on for taxes are sold at public auction to the highest bidder to quickly return them to the tax rolls.