Finding Solutions
Getting Results
Getting Results
CDTFA Sales Tax Audit: California Resale Certificate & XYZ Letter
Understanding California Resale Certificates and the XYZ Letter: Essential Tools for Sales and Use Tax Compliance under CDTFA sales tax regulations.
California imposes sales and use tax on the retail sale of tangible personal property. Businesses that buy goods intending to resell them can legitimately avoid paying tax on those purchases—but only if they follow strict documentation rules set by the California Department of Tax and Fee Administration (CDTFA). Two key (and often misunderstood) tools in this area are the California Resale Certificate and the XYZ Letter. While the resale certificate is a proactive, everyday compliance document, the XYZ Letter is a reactive, sales tax audit-specific procedure.
Misunderstanding either one can lead to unexpected tax liability, penalties, interest, and even criminal exposure in extreme cases of misuse. Below, we explain both in detail. A Resale Certificate issued by CDTFA is a written statement provided by a purchaser to a seller certifying that the items being purchased will be resold in the regular course of the purchaser’s business operations. When properly completed and accepted in good faith and on a timely basis, it relieves the seller of the obligation to collect sales tax on the transaction.
The purchaser (typically a retailer, wholesaler, or manufacturer) then collects tax from its own customers on the subsequent resale. California does not issue a unique “resale license” or certificate number. Instead, any registered seller with a valid seller’s permit may prepare and issue a resale certificate—either a one-time or blanket certificate—using the official CDTFA-230 General Resale Certificate or any other document that contains all required information. Required Elements of a Valid Resale Certificate A resale certificate must include the following (per CDTFA Regulation 1668 and Publication 103):
| Element | Description | Why It Matters |
|---|---|---|
| Seller’s Permit Number | The purchaser’s California seller’s permit number | Proves the buyer is registered to collect and remit tax |
| Type of Tangible Personal Property Sold | General description of the purchaser’s business (e.g., “retail clothing” or “wholesale electronics”) | Allows seller to verify the purchase aligns with the buyer’s operations |
| Specific Vendor Name | Name of the seller from whom goods are being purchased | Ties the certificate to the specific transaction or vendor |
| Description of Property | Either a specific list of items or a general description of property to be purchased | Must be clear enough for the seller to know what is covered |
| Resale Certification | Explicit statement that the property “will be resold … in the regular course of business operations” and “prior to any use other than demonstration and display” | The core exemption language |
| Purchaser’s Contact Information | Name, address, printed name and title of signer, telephone number, and date | Provides accountability |
| Signature | Signed by the purchaser, an employee, or authorized representative | Makes the document legally binding |
Important notes:
- The certificate must be obtained before or at the time of sale.
- Blanket certificates can cover all future purchases from that seller until revoked.
- Misuse (knowingly using a resale certificate for personal or business use instead of resale) can trigger a 10% penalty (minimum $500), plus possible misdemeanor charges under Revenue and Taxation Code § 6094.5.
What Is the XYZ Letter and What Is It Used For?
The XYZ Letter (officially the “XYZ Letter Procedure” described in CDTFA Form CDTFA-504-A and related forms) is not a resale certificate. It is an audit-specific verification tool used only when a seller lacks timely, valid resale certificates for transactions previously reported as exempt sales for resale.
During a CDTFA sales and use tax audit, the auditor may disallow claimed resale sales if supporting documentation is missing. At that point, the auditor may authorize the seller to use the XYZ Letter procedure to obtain post-sale confirmation from customers about how the property was ultimately used.How the XYZ Letter Procedure Works
- The auditor determines the procedure is appropriate and provides the seller with sample letters and statement forms (CDTFA-504 series).
- The seller customizes and mails (or emails) the letter and statement to the affected customers.
- The customer completes and signs a statement confirming one of the following:
- The property was resold in the regular course of business,
- The customer paid use tax directly to the CDTFA, or
- The property was used in another exempt manner.
- Responses are returned directly to the CDTFA (recommended) within a four-week window.
- The auditor reviews the responses and any additional evidence.
Key Limitations of the XYZ Letter
- It is not a substitute for a timely resale certificate taken in good faith at the time of sale.
- Even if the customer confirms resale, the seller may still be held liable if the auditor determines the original transaction required tax collection.
- The CDTFA explicitly states: “Unlike a valid resale certificate, a purchaser’s statement of resale taken after the sale does not relieve the seller of liability for the tax if it is found that the property was purchased for the buyer’s use and the applicable tax was not paid to the state prior to the date of your letter to your customer.”
- Incomplete, untrue, or contradicted responses will be rejected.
In short, the XYZ Letter is a damage-control mechanism during an audit, not a planning or compliance tool.Comparison: Resale Certificate vs. XYZ Letter
| Aspect | Resale Certificate (CDTFA-230 or equivalent) | XYZ Letter (CDTFA-504 Procedure) |
|---|---|---|
| Purpose | Proactive exemption at time of sale | Reactive verification during audit |
| Timing | Must be obtained timely (at or before sale) | Post-sale, only after audit begins |
| Legal Effect | Relieves seller of liability if taken in good faith | Helps meet burden of proof but does not guarantee relief |
| Official Form | CDTFA-230 (or compliant alternative) | CDTFA-504-A/B/C series |
| Who Initiates | Purchaser (buyer) | Seller (at auditor’s direction) |
| Risk if Ineffective | Penalties for misuse fall on purchaser | Seller remains potentially liable for tax + interest |
| Use in Everyday Business | Yes – routine compliance tool | No – audit-only |
Best Practices for Businesses and Taxpayers
- Always obtain and retain valid resale certificates before shipping or invoicing.
- Use the official CDTFA-230 or ensure any custom form contains every required element.
- Implement a robust system for collecting, verifying, and storing certificates (electronic is acceptable if legible and complete).
- Never accept a resale certificate for items that obviously will not be resold (e.g., office furniture for your own use).
- If you receive an audit notice and resale documentation is missing, consult counsel immediately—do not send XYZ Letters without auditor approval and proper customization.
- Consider voluntary disclosure or prospective collection strategies before an audit begins.
Proper use of resale certificates can save businesses significant tax dollars. However, once an audit starts, the XYZ Letter is often the last line of tax lawyer’s defense and it is a narrow one. Our California tax law firm regularly assists clients with resale certificate compliance programs, sales tax audit defense, and appeals involving disputed resale transactions. If you have questions about your sales and use tax documentation, audit exposure, or how to implement best-practice procedures, contact our tax team for a confidential consultation (310) 788-9820.