Nebraska Revised Statute 60-3,141
(1) The various county treasurers shall act as agents for the department in the collection of all motor vehicle taxes, motor vehicle fees, and registration fees.
(2) While acting as agents pursuant to subsection (1) of this section, the county treasurers shall in addition to the taxes and registration fees collect one dollar and fifty cents for each registration of a motor vehicle or trailer of a resident of the State of Nebraska and four dollars and fifty cents for each registration of a motor vehicle or trailer of a nonresident. The county treasurer shall credit such additional fees collected for the county to the county general fund.
(3) The county treasurers shall transmit all motor vehicle fees and registration fees collected to the State Treasurer on or before the twenty-fifth day of each month and at such other times as the State Treasurer requires for credit to the Motor Vehicle Fee Fund and the Highway Trust Fund, respectively, except as provided in section 60-3,156. Any county treasurer who fails to transfer to the State Treasurer the amount due the state at the times required in this section shall pay interest at the rate specified in section 45-104.02, as such rate may be adjusted from time to time, from the time the motor vehicle fees and registration fees become due until paid.
(4) If a registrant requests delivery of license plates, registration certificates, or validation decals by mail, the county treasurer may charge a postage and handling fee in an amount not more than necessary to recover the cost of postage and handling for the specific items mailed to the registrant.