Key takeaways
- A tax exemption certificate is a form a buyer gives a seller to show that a sale is exempt from sales or use tax.
- Common reasons include resale, manufacturing inputs, government and non-profit status. Rules are set state by state in the United States.
- The seller should collect a complete, valid certificate at or near the time of sale and keep it for audits.
- Resale certificates are one type. See the separate guide.
Free PDF and Excel: Exemption certificate collection checklist and register. Get it below
What it is
A tax exemption certificate is a document a buyer signs to certify that a purchase qualifies for exemption from sales or use tax, so the seller does not have to collect it.
In the United States, sales tax is set by states and local governments. Each state decides who is exempt and what form to accept. Many accept the Multistate Tax Commission uniform certificate or the Sales and Use Tax Agreement certificate for some uses, and some insist on their own form. Outside the US, other tax systems handle exemption in different ways, such as zero rating or reverse charge, which are not covered here.
A seller in one state sells equipment to a charity. The charity gives its exemption certificate with its registration number. The seller checks the form is complete, files it, and does not charge tax.
Two years later a state audit asks for proof. The seller produces the certificate and the sale stands. A seller with no certificate would have owed the tax.
Common categories
| Buyer or use | Typical basis | Note |
|---|---|---|
| Reseller | Goods bought for resale | See resale certificate |
| Manufacturer | Items that become part of a product | State rules differ |
| Government | Purchases by agencies | Usually requires a government ID or PO |
| Non-profit | Qualifying organisations | Many states require a state exemption number |
| Agriculture | Farm inputs | Eligibility varies |
| Interstate or export | Goods shipped out of state | Evidence of delivery needed |
Free PDF and Excel
Exemption certificate collection checklist and register
A checklist for validating certificates and a register that tracks expiry and reviews.
- Validation checklist
- Common categories
- Retention guide
- Excel certificate register
What a seller should check
- The buyer's name, address and the reason for exemption.
- The exemption or registration number, where the state requires one.
- The type of goods or services covered.
- A signature and date.
- The certificate is accepted in the state where the sale is sourced.
- It is valid at the date of sale, and the buyer is not on any state list of revoked numbers.
- Collected before or at sale.
- Stored with the invoice.
- Expiry dates tracked, where states require renewal.
- Reviewed annually.
- Customers with no valid certificate are charged tax.
Last checked: 19 October 2026. General overview of United States practice. State rules vary. Verify with the state revenue department or your tax adviser.
Frequently asked questions
What is a tax exemption certificate?
A form a buyer gives a seller to show that a sale is exempt from sales or use tax.
Who can use a tax exemption certificate?
Qualifying buyers such as resellers, certain manufacturers, government bodies and non-profits, depending on the state.
How long should a seller keep certificates?
At least as long as the state's audit period, often several years. Check your state.
Is a resale certificate the same as an exemption certificate?
A resale certificate is a type of exemption certificate for goods bought for resale.
What if a certificate is incomplete?
The seller risks owing the tax. Ask the buyer to complete it or charge tax.