This local option prevents any large shift of the property tax burden to the residential class of property owners after a revaluation. No information is available for this page.Exemption applications must be filed with your local assessor's office. See our Municipal Profiles for your local assessor's mailing address. Here are some of the important tax exemptions you should know about if you own a home in Nassau County. Tax year 2024 applications closed March 1, 2024. To qualify for Homestead Exemption (F. Deadline to file for Nassau County property tax exemptions. For further information or to obtain an application call 516-571-1500 or visit the Nassau County Assessor's website. Return the certification statement no later than 30 days from the date of the letter to the address provided in the letter.