Revenue and Taxation Code § 41106

41106.

(a) If the department determines that any overpayment has been made intentionally or by reason of carelessness, it shall not allow any interest thereon.

(b) If any person who has filed a claim for refund requests the department to defer action on the claim, the department, as a condition to deferring action, may require the claimant to waive interest for the period during which the person requests the department to defer action on the claim.