California Code, Government Code - GOV § 31641.21

Regular interest computed at the current interest rate as used in subdivision (b) of Section 31641.2 shall mean that amount of interest which would have been credited to the account of the member on the amount to be deposited at the interest rates established for the system if the contribution required by that section had been on deposit from the date used to determine the earnable compensation on which such contributions are based until the amount required to be deposited has been paid.