To handle California resale certificate verification, check the buyer’s seller’s permit number through the CDTFA’s online “Verify a Permit, License, or Account” tool or by calling the automated line at 1-888-225-5263.1California Department of Tax and Fee Administration. Online Services — Overview Do it at the time you accept the certificate, not later. If the permit turns out to be revoked or fake and you did not verify, you owe the sales tax on that transaction yourself, plus interest and potentially penalties.
Every sale of tangible personal property in California is presumed taxable until the seller proves otherwise.2California Legislative Information. California Revenue and Taxation Code 6091 A resale certificate taken “in good faith” overcomes that presumption, and the CDTFA presumes good faith when the certificate is complete on its face and the permit number checks out.3California Department of Tax and Fee Administration. Regulation 1668 – Sales for Resale Verification is how you lock that in.
Check the Certificate Itself First
Running a permit number is pointless if the paper the buyer handed you is incomplete. A California resale certificate does not have to use the official CDTFA-230 form; a letter or purchase order works, but it must contain all six required elements:4Taxes. Resale Certificates
- The purchaser’s legal business name and address.
- The California seller’s permit number, or a written explanation of why the buyer is not required to hold one.
- A specific description of the property being purchased. “Various merchandise” is not enough.
- An explicit statement that the property is being purchased for resale.
- The date the certificate is signed.
- The signature of the purchaser or an authorized representative.
If anything is missing, the certificate is incomplete. Ask for a corrected version before treating the sale as exempt. The blank CDTFA-230 form is a simple way to avoid gaps.5California Department of Tax and Fee Administration. General Resale Certificate – CDTFA-230
How to Run the Permit Number
Once the certificate is complete, verify the number through one of two CDTFA channels:
- The “Verify a Permit, License, or Account” tool on the CDTFA website. You enter the permit number, the transaction date, and identifying details about the purchaser, and the system returns a real-time status.1California Department of Tax and Fee Administration. Online Services — Overview
- The automated phone line at 1-888-225-5263, which is useful at a counter, a trade show, or anywhere web access is awkward.
Timing matters. Run the check when you first accept the certificate. Verifying weeks later does not establish good faith as of the sale date. Save the verification confirmation together with the certificate. You will need both if the sale is ever audited.
What the Result Tells You
Active or Valid
The permit is current and the buyer is registered. Proceed with the tax-exempt sale and keep the certificate and verification record on file.
Invalid or Revoked
The number does not point to an active account. Treat the transaction as a taxable retail sale and collect the full applicable rate. There is no pending status that lets you ship first and sort it out later. Combined California sales tax rates run from 7.25% to 11.25% in 2026, and on a $50,000 sale at 9.5% that is $4,750 the seller eats if the goods leave untaxed.
No Match
The system cannot find the number. That could be a typo or a fabricated number. Contact the CDTFA directly before releasing the goods tax-free, and in the meantime collect the sales tax. If the permit turns out to be valid, you can refund the tax reimbursement to the buyer.
Red Flags on the Certificate Itself
Verification confirms the permit is real. It does not confirm the buyer is actually reselling what they are buying. A resale certificate only covers goods the buyer genuinely intends to resell. Anything the buyer will use or consume in their own operations is taxable, no matter what the certificate says.6California Department of Tax and Fee Administration. Sales for Resale (Publication 103) Table of General Guidelines
Office equipment and office supplies are the most common trap across almost every industry. The same goes for a contractor buying hand tools, an auto shop buying solvents, or an accounting firm buying computers. CDTFA regulations tell sellers to demand a more detailed certificate, or refuse the exemption, when the goods on the invoice do not match the buyer’s normal resale inventory.3California Department of Tax and Fee Administration. Regulation 1668 – Sales for Resale If a janitorial company hands you a resale certificate for cleaning supplies it will use on client jobs, that certificate is invalid for those items. The company is the end user.
Blanket Certificates for Repeat Buyers
You do not need a new certificate for every order from the same buyer. A single blanket certificate can cover an ongoing relationship. The buyer fills out one certificate referencing “see purchase order,” and each subsequent purchase order marks whether the items are for resale or taxable.7California Department of Tax and Fee Administration. Sales and Use Tax Annotations – 475.0000
One catch. If a purchase order under a blanket certificate does not specify resale or taxable, the CDTFA assumes the purchase was for the buyer’s own use and the sale is taxable. Verify the permit when you first accept the blanket, and re-verify periodically on long-running accounts. A permit that was active two years ago may have been revoked since.
Out-of-State Buyers
An out-of-state purchaser who makes no sales in California is not required to hold a California seller’s permit, but can still provide a resale certificate. The certificate must include a written explanation such as “purchaser does not make sales in this state” in place of the permit number.4Taxes. Resale Certificates All other elements are still required.
Because there is no California number to run through the online tool, these certificates carry more risk. Confirm the buyer’s home-state registration where you can, and look harder at whether the goods described fit the buyer’s actual line of business. A separate point worth flagging: if the goods are being exported out of the country, a resale certificate alone is not enough. Export sales have their own documentation rules under Regulation 1620.8Cornell Law Institute. Cal. Code Regs. Tit. 18, 1667 – Exemption Certificates
If a Certificate Turns Out Bad After the Sale
Sometimes you only learn a certificate was invalid after the goods have shipped. An invalid certificate does not automatically make the sale taxable, but it does strip the automatic protection and put the burden back on you to show the sale was genuinely for resale.9California Department of Tax and Fee Administration. Annotation 475.0103 – Invalid Certificate
Contact the buyer right away. Either get a corrected, valid certificate or collect the sales tax owed. If the buyer will not cooperate, report and remit the tax on your next return. Self-reporting a known deficiency avoids the negligence penalty that applies when the CDTFA finds the problem first in an audit. Interest on deficiencies runs at 10% for 2026.10California Department of Tax and Fee Administration. Interest Rates
How Long to Keep the Records
Keep the certificate, the verification confirmation, and the related invoices for at least four years from the date of the transaction.11California Department of Tax and Fee Administration. Sales and Use Tax Regulations – Article 18 – Section: Regulation 1698. Records That is the floor. The CDTFA’s audit window is three years from the filing date for periods where a return was filed, eight years if no return was filed, and open-ended in cases of fraud or intent to evade.12California Department of Tax and Fee Administration. Sales and Use Tax Law – Section 6487 If a particular transaction looks like it could be challenged, hold the records until the relevant statute has run. Clean digital copies are acceptable.