California Code, Revenue and Taxation Code - RTC § 272

Notwithstanding any other provision of law, whenever a valid application for exemption on the property is filed pursuant to Section 270 or 271 and the assessor grants the claim prior to the completion of the roll for the year for which the exemption is claimed, the assessor shall enroll the property so as to provide for the amount of exemption on the property's assessed value as provided by the applicable section.

When the application for exemption on the property or the granting of the claim occurs after completion of the roll, the assessor shall initiate an action to correct the roll by addition of the appropriate amount of exemption on the property. Upon notification by the assessor, the auditor shall make the appropriate adjustment on the roll.

Where authorized under the provisions of this article, the tax, penalty or interest thereon subject to cancellation or refund shall be canceled pursuant to Article 1 (commencing with Section 4985) of Chapter 4 of Part 9, as if it had been levied or charged erroneously, and, if paid, a refund thereof shall be made pursuant to Article 1 (commencing with Section 5096) of Chapter 5 of Part 9 as if it had been erroneously collected. The amount of tax, penalty or interest which is not canceled or refunded under this article with respect to property tax exemptions covered by this article and filed late may be paid in installments as provided in Chapter 3 (commencing with Section 4186) of Part 7.