Cal. Code Regs. tit. 18, § 1668
(a) Resale Certificate.
The burden of proving that a sale of tangible personal property is not at retail is upon the seller unless the seller timely takes in good faith a certificate from the purchaser that the property is purchased for resale. If timely taken in proper form as set forth in subdivision (b) and in good faith from a person who is engaged in the business of selling tangible personal property and who holds a California seller's permit as required by Regulation 1699, Permits, the certificate relieves the seller from liability for the sales tax and the duty of collecting the use tax. A certificate will be considered timely if it is taken at any time before the seller bills the purchaser for the property, or any time within the seller's normal billing and payment cycle, or any time at or prior to delivery of the property to the purchaser. A resale certificate remains in effect until revoked in writing.
(b) Form of Certificate.
(1) Any document, such as a letter or purchase order, timely provided by the purchaser to the seller will be regarded as a resale certificate with respect to the sale of the property described in the document if it contains all of the following essential elements:
(4) Qualified Resale Certificate. If a purchaser wishes to designate on each purchase order whether the property being purchased is for resale, the seller should obtain a qualified resale certificate, i.e., one that states “see purchase order” in the space provided for a description of the property to be purchased. Each purchase order must then specify whether or not the property covered by the order is purchased for resale. The use of the phrases “for resale,” “resale = yes,” “nontaxable,” “taxable = no,” or similar terminology on a purchase order, indicating that tax or tax reimbursement should not be added to the sales invoice will be regarded as designating that the property described is purchased for resale provided the combination of the purchase order and the qualified resale certificate contains all the essential elements provided in subdivision (b)(1). However, a purchase order where the applicable amount of tax is shown as $0 or is left blank will not be accepted as designating that the property is purchased for resale, unless the purchase order also includes the phrase “for resale” or other terminology described above to specify that the property is purchased for resale. If each purchase order does not so specify, or is not issued timely within the meaning of subdivision (a), it will be presumed that the property covered by that purchase order was not purchased for resale and that sale or purchase is subject to tax. If the purchase order includes both items to be resold and items to be used, the purchase order must specify which items are purchased for resale and which items are purchased for use. For example, a purchase order issued for raw materials for resale and also for tooling used to process the raw materials should specify that the raw materials are purchased for resale and that the sale of the tooling is subject to tax.
The seller shall retain copies of the purchase orders along with the qualified resale certificates in order to support the sales for resale.
(d) Improper Use of Certificate. Except when a resale certificate is issued in accordance with subdivisions (h), (i) or (j):
(e) Other Evidence to Rebut Presumption of Taxability. A sale for resale is not subject to sales tax. A person who purchases property for resale and who subsequently uses the property owes tax on that use. A resale certificate which is not timely taken is not retroactive and will not relieve the seller of the liability for the tax. Consequently, if the seller does not timely obtain a resale certificate containing the essential elements as described in subdivision (b)(1), the seller will be relieved of liability for the tax only where the seller shows that the property:
(f) Use of XYZ Letters. A seller who does not timely obtain a resale certificate may use any verifiable method of establishing that it should be relieved of liability for tax under subdivision (e). One method that the Board authorizes to assist a seller in satisfying its burden to show that the sale was for resale or that tax was paid, is the use of “XYZ letters.” XYZ letters are letters in a form approved by the Board which are sent to some or all of the seller's purchasers inquiring as to the purchaser's disposition of the property purchased from the seller. An XYZ letter will include certain information and request responses to certain questions, set forth below. The XYZ letter may also be further customized by agreement between the Board's staff and the seller to reflect the seller's particular circumstances.
(2) An XYZ letter will request that the purchaser, purchaser's employee or authorized representative check one of the boxes provided inquiring as to whether the property in question was:
(F) When the purchaser answers either (D) or (E) affirmatively (box checked), the XYZ letter will inquire further whether:
(g) Purchaser's Liability for Tax. A purchaser who issues a resale certificate containing the essential elements as described in subdivision (b)(1) and that otherwise appears valid on its face, or who otherwise purchases tangible personal property that is accepted by the Board as purchased for resale pursuant to subdivision (f) and who thereafter makes any storage or use of the property other than retention, demonstration, or display while holding it for sale in the regular course of business is liable for use tax on the cost of the property. The tax is due at the time the property is first stored or used and must be reported and paid by the purchaser with the purchaser's tax return for the period in which the property is first so stored or used. A purchaser cannot retroactively rescind or revoke a resale certificate and thereby cause the transaction to be subject to sales tax rather than use tax.
A purchaser who issues a resale certificate for property which the purchaser knows at the time of purchase is not to be resold in the regular course of business is liable for the sales tax on that purchase measured by the gross receipts from the sale to that purchaser. The tax is due as of the time the property was sold to the purchaser and must be reported and paid by the purchaser with the purchaser's tax return for the period in which the property was sold to the purchaser.
(h) Mobilehomes. A mobilehome retailer who purchases a new mobilehome for sale to a customer for installation for occupancy as a residence on a foundation system pursuant to section 18551 of the Health and Safety Code, or for installation for occupancy as a residence pursuant to section 18613 of the Health and Safety Code, and which mobilehome is thereafter subject to property taxation, may issue a resale certificate to the mobilehome vendor even though the retailer is classified as a consumer of the mobilehome by sections 6012.8 and 6012.9 of the Revenue and Taxation Code. Also, a mobilehome retailer, licensed as a mobilehome dealer under section 18002.6 of the Health and Safety Code, who purchases a new mobilehome for sale to a customer for installation for occupancy as a residence on a foundation system pursuant to section 18551 of the Health and Safety Code, may issue a resale certificate to the mobilehome vendor even though the mobilehome retailer may have the mobilehome installed on a foundation system as an improvement to realty prior to the retailer's sale of the mobilehome to the customer for occupancy as a residence.
Where the mobilehome is acquired by a mobilehome retailer, who is not licensed as a dealer pursuant to section 18002.6 of the Health and Safety Code, for affixation by the retailer to a permanent foundation, or for other use or consumption (except demonstration or display while holding for sale in the regular course of business), prior to sale, the mobilehome retailer may not issue a resale certificate. The mobilehome retailer shall notify the vendor that the purchase is for consumption and not for resale. When a mobilehome manufacturer or other vendor is informed or has knowledge that the purchaser will install the mobilehome on a permanent foundation prior to its resale, the manufacturer or other vendor is not making a sale for resale. Such vendor is making a taxable retail sale and cannot accept a resale certificate in good faith.
Note: Authority cited: Section 7051, Revenue and Taxation Code. Reference: Sections 6007, 6009.2, 6012.8, 6012.9, 6072, 6091-6095, 6241-6245, 6484, 6485 and 7153, Revenue and Taxation Code.
1. Amendment and renumbering of Section 2068 filed 11-5-69; effective thirtieth day thereafter (Register 69, No. 45).
2. Amendment filed 4-15-77; effective thirtieth day thereafter (Register 77, No. 16).
3. Amendment of subsection (e) filed 12-20-77; effective thirtieth day thereafter (Register 77, No. 52).
4. Amendment filed 5-27-83; effective thirtieth day thereafter (Register 83, No. 22).
5. Amendment of subsection (g) and repealer of subsection (h) filed 5-28-85; effective thirtieth day thereafter (Register 85, No. 22).
6. Amendment of subsection (e) filed 6-5-86; effective thirtieth day thereafter (Register 86, No. 23).
7. Change without regulatory effect of subsection (e) (Register 86, No. 51).
8. Amendment of subsections (b)(2), (b)(2)(B) and (d) filed 6-6-2001; operative 7-6-2001 (Register 2001, No. 23).
9. Amendment of section heading and section filed 4-16-2002; operative 5-16-2002 (Register 2002, No. 16).
10. Editorial correction inserting inadvertently omitted Appendices A and B (Register 2002, No. 23).
11. Change without regulatory effect amending subsections (d)(1)-(2), adopting new subsection (d)(3) and amending Note filed 6-5-2007 pursuant to section 100, title 1, California Code of Regulations (Register 2007, No. 23).
12. Amendment of section and Appendix A filed 7-30-2009; operative 8-29-2009 (Register 2009, No. 31).
13. Amendment of subsections (a), (b)(1)(C), (d), (d)(2), (f), (f)(1), (f)(2)(C), (f)(2)(F)3., (f)(3) and (h), new subsection (j) and amendment of Note filed 4-22-2016; operative 7-1-2016 (Register 2016, No. 17).