No information is available for this page. What is a "Homestead Exemption"?The deadline for filing tax exemption applications for the 2025-2026 Assessment Roll with the Nassau County Department of Assessment is January 2, 2025. Exemption applications must be filed with your local assessor's office. See our Municipal Profiles for your local assessor's mailing address. How does the homestead tax option work? Here are some of the important tax exemptions you should know about if you own a home in Nassau County. Deadline to file for Nassau County property tax exemptions. The New York State STAR Credit Program filing deadline for Nassau County Residents is July. The Land Split Application for a Parent Tract Split and Open Rural Homestead Land Split can be found here.