Exemption, Form 458B (available from the county assessor), is required. When is the deadline to file my Homestead Exemption application?The application filing period is February 2 to June 30. Applications must be filed between the first Monday in. January and March 1. As of June 7, 2017, we have not received your Homestead Exemption. Application for 2017. You must file your homestead exemption application with your county tax officials. Application Submission. To apply for the Nebraska homestead exemption, the applicant needs to fill out and submit Form 458.