California Code
CHAPTER 6 - Prohibited Practices and Penalties
Section 18439.

18439. If any amount in excess of the charges permitted by this division, including interest, is charged, contracted for, or received in the making or collection of a contract of loan, except as a result of an accidental and bona fide error in computation, such contract is void and no person has any right to collect or receive the principal, interest, or charges.

(Added by Stats. 1976, Ch. 964.)