For the first year of filing, a Certification of Disability for Homestead Exemption, Form 458B (available from the county assessor). Form 458 must be filed with the Sarpy County Assessor's Office to apply for the exemption.To claim the exemption, the homeowner must make a one-time filing with the county assessor where the property is located. The Nebraska Homestead Exemption program is a property tax relief program that reduces all or a portion of taxes for homeowners in Nebraska who occupy a home. YES. NO. • If No, please indicate the correct information in the appropriate area. FORM. 458. The Nebraska Department of Revenue Jan. See Federal Form 4797. Gov or mail to: Adams County Assessor 300 N Saint Joseph Ave The claim form, BOE-266, Claim for Homeowners' Property Tax Exemption, is available from the county assessor. You may file for an exemption between February 1st and June 30th of each year.