To handle California resale certificate verification, check the purchaser’s seller’s permit number through the CDTFA’s online “Verify a Permit, License, or Account” tool, or call the automated verification line at 1-888-225-5263. Do it at the time you accept the certificate, not later. If you skip verification and the permit turns out to be revoked or fake, you owe the uncollected sales tax yourself, plus interest and potentially penalties.
Why Verification Matters
Every sale of tangible personal property in California is presumed to be a taxable retail sale until the seller proves otherwise.1California Legislative Information. California Revenue and Taxation Code 6091 You overcome that presumption by collecting a resale certificate taken in good faith.2Cornell Law Institute. Cal. Code Regs. Tit. 18, 1667 – Exemption Certificates The CDTFA presumes you acted in good faith if the certificate contains every required element and appears valid on its face.3California Department of Tax and Fee Administration. Regulation 1668 – Sales for Resale Running the permit number through official channels is the clearest way to show you did your part.
The cost of getting this wrong is real. If an audit finds you accepted a certificate tied to a revoked or nonexistent permit, you owe the uncollected sales tax and interest at 10% for 2026.4California Department of Tax and Fee Administration. Interest Rates Combined state and local rates in California range from 7.25% to 11.25% in 2026, so the exposure on a mid-sized order can move into the thousands quickly.
What the Certificate Must Contain Before You Verify Anything
Look at the document first. A resale certificate does not have to be on the official CDTFA-230 form. A letter, purchase order, or other written document works, as long as it includes all six required elements:5Taxes. Resale Certificates
- The purchaser’s legal business name and mailing address.
- The California seller’s permit number, or a written explanation of why the purchaser is not required to hold one (for example, an out-of-state business that makes no sales in California).
- A specific description of the goods, not just “various merchandise.”
- An explicit statement that the property is being purchased for resale.
- The date the certificate was signed.
- The purchaser’s signature, or that of an authorized representative.
If any element is missing, the certificate is incomplete and you should not treat the sale as tax-exempt until you get a corrected version. The CDTFA-230 form is a convenient way to make sure nothing is left out, and a blank copy is available on the CDTFA website.6California Department of Tax and Fee Administration. General Resale Certificate – CDTFA-230
How to Verify the Permit Number
Once the certificate is complete, verify the permit number. The CDTFA offers two methods:
- The online “Verify a Permit, License, or Account” system on the CDTFA website gives a real-time status check. You enter the permit number, the transaction date, and identifying details about the purchaser.7California Department of Tax and Fee Administration. Online Services — Overview
- The automated phone line at 1-888-225-5263 handles the same check by phone, which is useful at a counter or trade show.
Run the check at the time you first accept the certificate. Verifying weeks later does not establish good faith as of the transaction date. Save the confirmation with the certificate itself. You will need both if the CDTFA audits the sale.
Reading the Verification Result
The tool returns one of three general outcomes, and each calls for a different response.
Active or Valid
The permit is current and the purchaser is registered. You have met the good-faith standard and can process the sale as tax-exempt. Keep the certificate and verification record for at least four years from the transaction date.8California Department of Tax and Fee Administration. Sales and Use Tax Regulations – Article 18 – Section: Regulation 1698. Records
Invalid or Revoked
The number does not correspond to an active account. Treat the transaction as a taxable retail sale and collect the full applicable sales tax. If you release the goods without collecting tax, you are personally liable. There is no grace period and no pending status that lets you wait.
No Match
The system cannot find the number. It could be a typo or a fabricated number. Contact the CDTFA directly before releasing goods tax-free. Until you get confirmation of an active permit, collect the tax. You can refund the reimbursement to the buyer later if the permit turns out to be valid.
Watch the Goods, Not Just the Permit
A resale certificate only covers goods the buyer genuinely intends to resell. Anything the buyer consumes or uses in its own operations is a taxable purchase, and a certificate does not change that. If a janitorial company hands you a certificate for cleaning supplies it plans to use on client jobs, the certificate is invalid for those items because the company is the end user.9California 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 nearly every industry the CDTFA lists, those are flagged as taxable purchases that cannot be bought with a resale certificate. The same goes for hand tools for a contractor, solvents for an auto shop, or computer hardware for an accounting firm. If the goods do not match the buyer’s typical resale inventory, that is a red flag, and CDTFA regulations tell sellers to demand a more detailed certificate in that situation.3California Department of Tax and Fee Administration. Regulation 1668 – Sales for Resale A valid permit number does not cure a certificate that covers goods the buyer will consume.
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 series of purchases. The buyer fills out one certificate with the description field referencing “see purchase order,” and each subsequent purchase order specifies whether the items on that order are for resale or taxable.10California 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 whether the goods are for resale, the CDTFA assumes the purchase was for the buyer’s own use and the sale is taxable. Verify the permit number when you first accept the blanket certificate, and consider re-verifying periodically for long-term accounts. A permit active two years ago may have been revoked since.
Out-of-State Buyers
An out-of-state purchaser who does not make 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 of why the buyer does not hold a California permit, such as “purchaser does not make sales in this state.”5Taxes. Resale Certificates All the other required elements still apply.
Because there is no California permit number to run through the online tool, these sales carry more risk. Confirm the buyer’s home-state registration if you can, and pay closer attention to whether the goods described are consistent with the buyer’s line of business. If the goods are being exported out of the country, a resale certificate alone does not provide sales tax relief. You have to meet the separate documentation requirements for sales in foreign commerce.2Cornell Law Institute. Cal. Code Regs. Tit. 18, 1667 – Exemption Certificates
Drop Shipments
Drop shipments add a layer. When an out-of-state retailer orders goods from a California supplier and has them shipped directly to a California customer, the CDTFA presumes the California supplier is the retailer responsible for sales tax.11California Department of Tax and Fee Administration. Regulation 1706 – Drop Shipments
The supplier can overcome that presumption in two ways: by accepting a valid resale certificate from the out-of-state retailer (which must include a California permit number or an explanation of why one is not required), or by accepting a valid resale certificate from the California end customer to whom the goods are delivered. Either certificate has to contain all the standard required elements. Get the certificate before shipping. Sorting this out after delivery is far harder.
If You Find Out After the Sale That the Certificate Was Bad
Sometimes you do not learn a certificate was invalid until after the goods have shipped. An invalid certificate does not automatically make the transaction taxable, but it eliminates your automatic protection and puts the burden of proof back on you.12California Department of Tax and Fee Administration. Annotation 475.0103 – Invalid Certificate You would need specific evidence that the sale was genuinely for resale.
Contact the buyer immediately and either get a corrected certificate or collect the sales tax owed. If the buyer will not cooperate, report and remit the tax on your next return rather than waiting for an audit to find it. Self-reporting a known deficiency avoids the negligence penalty that applies when the CDTFA discovers the problem first.
How Long to Keep the Records
The standard statute of limitations for a CDTFA deficiency determination is three years from the filing date for periods where you filed a return. If you failed to file a return, the window stretches to eight years.13California Department of Tax and Fee Administration. Sales and Use Tax Law – Section 6487 In cases involving fraud or intent to evade, there is no time limit at all.
The four-year record retention rule is the floor, not the ceiling.8California Department of Tax and Fee Administration. Sales and Use Tax Regulations – Article 18 – Section: Regulation 1698. Records If you have any reason to think a transaction might be questioned, keep the certificate, the verification printout, and the related invoices until the relevant statute has run. Digital copies are fine as long as they are complete and legible.