California Code, Revenue and Taxation Code - RTC § 276.1

(a) For property for which the disabled veterans' exemption described in Section 205.5 would have been available but the taxpayer had not yet received a disability rating from the United States Department of Veterans Affairs (USDVA), there shall be canceled or refunded the amount of any taxes, including any interest and penalties thereon, subject to the provisions regarding cancellations in Article 1 (commencing with Section 4985) of Chapter 4 and the limitations periods on refunds as described in Article 1 (commencing with Section 5096) of Chapter 5, levied on that portion of the assessed value of the property that would have been exempt under a timely and appropriate claim, provided that the claimant files an appropriate claim for the disabled veterans' exemption described in Section 205.5 the later of 90 days of receipt of the disability rating from the USDVA or on or before the next following lien date.

(b) Subject to the provisions regarding cancellations and the limitations periods on refunds, the disabled veterans' exemption shall apply beginning on the effective date, as determined by the USDVA, of a disability rating that qualifies the claimant for the exemption.