Adds the following to the creditable service provisions of the Retirement Systems for Teachers and State Employees (TSERS) and Local Governmental Employees (LGERS) set out in GS 135-4 and GS 128-26. Provides for an individual who was not eligible to earn membership service in a calendar year because of the anticipation that the individual would not meet the definition of employee due to not working at least 30 hours per week for nine or more months in that calendar year (applicable to TSERS) or working less than 1,000 hours during that calendar year (applicable to LGERS) to be eligible to purchase creditable service for that calendar year if the individual did in fact work at least 30 hours a week for nine or more months or at least 1,000 hours in that calendar year, as applicable. Details six requirements for purchases under the new provision, including notification of such hours worked by the employer, the employee purchasing service based on the actual number of hours worked in a lump sum amount within 30 days of the employer notification, the Retirement Systems Division invoicing the employer upon the employee's payment, and the employer paying the invoiced contribution amount within 30 days of receipt of the invoice. Limits the cumulative amount of creditable service purchased under the provision to no more than a total of five years, and excludes retired members from the provision. Effective January 1, 2021, and applies to the purchase of service for work performed on or after January 1, 2020.