Tax bills are issued twice a year, once in January for the General Tax Bill, and once in October for the School Tax Bill. Second Half 2023 General Tax due July 1 - Payable without penalty to August 10, 2023.Payment by credit card and electronic check will incur a service fee. Please note: Only the current, open tax year can be paid. Once a tax levy is closed, payments should be made to the Nassau County Treasurer. Please contact the Nassau County Treasurer's Office to pay past taxes and open tax liens.