N.D. Cent. Code § 54-27.2-01

The budget stabilization fund is a special fund in the state treasury. The state investment board shall supervise investment of the budget stabilization fund in accordance with chapter 21-10. Any interest or other budget stabilization fund earnings must be credited to the fund. Any amounts provided by law for deposit in the fund and any interest or earnings of the fund which would bring the balance in the fund at the end of any fiscal year to an amount greater than fifteen percent of the current biennial state general fund budget, as finally approved by the most recently adjourned special or regular session of the legislative assembly, may not be deposited in or credited to the fund but must be deposited instead in the state general fund.