Neb. Rev. Stat. § 37-427

The habitat stamp, aquatic habitat stamp, or Nebraska migratory waterfowl stamp required by section 37-426 is not transferable. The lifetime habitat stamp, the lifetime aquatic habitat stamp, and the lifetime Nebraska migratory waterfowl stamp do not expire. A multiple-year stamp expires at midnight on December 31 in the last year for which the multiple-year stamp is valid. A habitat stamp purchased for a permit which is valid into the next calendar year expires when the permit expires. Any other stamp expires at midnight on December 31 in the year for which the stamp is issued.