What should a small online store do when a customer asks to buy tax exempt?

Why the certificate matters more than the customer's status

A buyer being a nonprofit, a reseller, or a public school does not by itself allow you to skip tax. What protects you is a valid exemption certificate accepted in good faith before or at the time of sale. If a state audits you and finds an untaxed order without a certificate on file, the state typically treats the sale as taxable and assesses the tax, interest, and often a penalty against you, the seller, regardless of what the buyer told you. The burden of proof sits with the seller, which is why exemption documentation is one of the most common audit findings for small online stores. Related: Common Sales Tax Mistakes Small Sellers Make

There are several types of exemption you will encounter. Resale certificates cover buyers who will resell the goods or incorporate them into a product for sale. Entity-based exemptions cover organizations such as government agencies, and in some states charities, schools, and religious organizations. Use-based exemptions cover purchases used in a specific exempt way, such as manufacturing equipment or agricultural inputs. Each type has its own form and its own rules about what the buyer may purchase tax free, and a certificate for one type does not cover the others. Related: Product Taxability: Why Not Everything Is Taxed the Same

Keep reading: US Sales Tax Basics for Online Sellers, What Economic Nexus Means and Why It Matters, Origin vs Destination Based Sales Tax, Explained. See how SalesTaxly helps you us sales tax rates and lookup for online stores.

Which forms to accept and how to check them

Most states issue their own certificate forms, and many also accept two multistate documents: the Streamlined Sales Tax exemption certificate, used by member states, and the Multistate Tax Commission uniform certificate, which a number of states accept for resale purposes. A certificate must generally show the buyer's name and address, the type of exemption claimed, the buyer's registration or exemption number where the state requires one, a description of the goods, and a signature and date. A photo of a business license or a note saying "we are tax exempt" is not a certificate and will not survive an audit. Related: Why does the sales tax rate differ between two addresses in the same city?

Good faith acceptance means the certificate is complete, the claimed exemption makes sense for what is being purchased, and nothing about the transaction suggests the certificate is being misused. A restaurant buying office chairs for resale should raise a flag. Many states offer an online tool to validate a registration number, and using it takes a minute. Some states require you to accept only their own form or a certificate bearing an in-state registration number, so check the rule for the ship-to state rather than assuming a resale certificate from the buyer's home state is enough everywhere.

Handling exempt requests in an online checkout

The workable pattern for a small store is a two-step process: the customer creates an account and submits a certificate through a form or by email, you review it, and only then do you flag that account as exempt for the specific states covered. Do not refund tax retroactively on past orders unless the certificate was valid at the time of the original sale and your state allows it. Marking an entire account exempt in every state on the basis of one state's certificate is a common shortcut that creates exposure in the states not covered.

Store each certificate with the date received, the states it covers, and an expiration date if the state imposes one. Several states require certificates to be renewed periodically, while others treat them as valid until revoked. Link the certificate to the orders it supports so that an auditor can trace any untaxed sale to its document in seconds. If you use a rate service that supports exemption management, use its certificate storage rather than a shared drive, because the audit trail is what you are actually buying.

Drop shipping and other situations that trip people up

Drop shipping is where exemption logic gets tangled. If a retailer buys from you and asks you to ship directly to their customer, the retailer typically hands you a resale certificate. The complication is that the retailer may not be registered in the state where the end customer lives, and some states will not accept an out-of-state resale certificate for a delivery into their borders. In those states you may need to collect tax from the retailer or accept an alternative document the state permits. Read the rule for each ship-to state before agreeing to a drop-ship arrangement at scale. Related: How do you handle sales tax on shipping charges when selling to customers in different states?

Two more traps deserve attention. First, exemption certificates cover the buyer, not the payment method, so an exempt organization paying with an employee's personal card is a problem in many states. Second, a certificate received after the sale does not fix the sale in most states unless the state has a specific grace period. When in doubt, charge the tax and let the buyer request a refund from the state; that path is slower for the customer but leaves you with no exposure.