Neb. Rev. Stat. §§ 18-406
The special assessment provided in section 18-405 shall be paid in ten installments. The first installment, or one-tenth of the assessment, shall become due and delinquent fifty days after the date of levy, and one-tenth of such assessment shall become due and delinquent each year thereafter, counting from the date of levy, for nine years. The special assessment shall bear interest at a rate not to exceed the rate of interest specified in section 45-104.01, as such rate may from time to time be adjusted by the Legislature, prior to delinquency, and at the rate specified in section 45-104.01, as such rate may from time to time be adjusted by the Legislature, after delinquency. Prior to the levy of the special assessment as provided in section 18-405, such assessment shall be equalized in the same manner as provided by law for the equalization of special assessments levied in the city or village that levied such special assessment, or in the city of the metropolitan class within the metropolitan utilities district that levied such special assessment.
Neb. Rev. Stat. §§ 18-406