California Code, Revenue and Taxation Code - RTC § 6225

(a) In order to facilitate the collection of use tax imposed by this part, a qualified purchaser shall register with the department on a form prescribed by the department and shall set forth the name under which the qualified purchaser transacts or intends to transact business, the location of the qualified purchaser's place or places of business, and other information as the department may require.

(b) Article 1 (commencing with Section 6451) of Chapter 5 shall apply to a qualified purchaser, except that a return showing the total sales price of the tangible personal property purchased by the qualified purchaser, the storage, use, or other consumption of which became subject to the use tax during the preceding calendar year, and which was not paid to a retailer required to collect the tax or which was not paid to a retailer the qualified purchaser reasonably believed was required to collect the tax, shall be filed, together with a remittance of the amount of the tax due, with the department on or before April 15.

(c) A “qualified purchaser” means a person that meets all of the following conditions:

(d) This section shall not apply to the purchase of a vehicle, vessel, or aircraft as defined in Article 1 (commencing with Section 6271) of Chapter 3.5.

(e) This section shall remain in effect only until January 1, 2029, and as of that date is repealed.