A resale certificate is a document a buyer gives a seller to purchase goods without paying sales tax, on the grounds that the buyer plans to resell those goods rather than use them. The tax gets collected later, when the end customer buys the item at retail. It is the buyer’s way of proving to the seller that an exemption applies, and it shifts the responsibility for that claim onto the buyer.
How it works
The buyer registers with their state’s tax authority and receives a permit or registration number. They then complete a resale certificate (often a state form, or a multi-state form like the MTC Uniform Sales and Use Tax Certificate) listing that number and the type of goods being bought for resale. The seller keeps the certificate on file. If the state audits the seller, the certificate is the evidence that supports the untaxed sale. Rules vary by state, so a certificate valid in one state may not cover another.
Why it matters
Charging sales tax to a legitimate reseller creates friction and can lose the deal, but skipping tax without documentation exposes the seller to liability. The certificate is what lets a merchant do the right thing: exempt qualifying buyers while staying defensible in an audit. The seller is still expected to accept certificates in good faith and confirm they look complete and valid.
In B2B quoting on Shopify
Wholesale and trade buyers usually expect tax-exempt pricing, so this comes up constantly on quotes. A common workflow is to collect the resale certificate before finalizing the quote, mark the buyer or the relevant line items as tax-exempt in Shopify, then send a quote that reflects the correct total. Handling the exemption at the quote stage (rather than after checkout) keeps the number the buyer accepts and pays accurate. For related concepts see the B2B quoting glossary.