N.C. Gen. Stat. § 147-68.1

The cost of administration, management, and operations of the banking operations of the Department of State Treasurer shall be apportioned and paid equitably among the funds and programs using these services, in a manner prescribed by the State Treasurer. To the extent not otherwise chargeable directly to the income or assets of a specific fund or program, the cost of administration, management and operations of the banking operations of the Department of State Treasurer shall be paid from the income and assets of the funds and programs using these services. Any apportionment and payment under this section shall be accounted for in a manner determined by the State Treasurer.