California Code, Revenue and Taxation Code - RTC § 6487.06

(a) Notwithstanding Section 6487, the period during which a deficiency determination may be served to a qualifying purchaser is limited to three years after the last day of the calendar month following the quarterly period for which the amount is proposed to be determined.

(b) For purposes of this section, a “qualifying purchaser” is a person that voluntarily files an individual use tax return for tangible personal property that is purchased from a retailer outside of this state for storage, use, or other consumption in this state, and that meets all of the following conditions:

(c) If the department makes a determination that the purchaser's failure to timely report or remit the taxes imposed by this part is due to reasonable cause or due to circumstances beyond the purchaser's control, the purchaser may be relieved of any penalties imposed by this part. Any purchaser seeking relief from penalties imposed by this part shall file a statement, signed under penalty of perjury, setting forth the facts that form the basis for the claim for relief.

(d) This section shall not apply to purchases of vehicles, vessels, or aircraft as defined in Article 1 (commencing with Section 6271) of Chapter 3.5.