Blanket resale certificates cover ongoing purchases from one buyer. Single-purchase certs cover exactly one transaction. Here's when each applies and which is safer.
State audit lookback windows range from 3 to 7 years. Here's the retention period each US state requires for resale certificates, plus a conservative rule of thumb.
Every state's Department of Revenue publishes a seller's-permit or tax-ID verification tool. Here are the direct links, plus a checklist of what to verify before you accept.
When a drop-ship retailer asks you to ship to an end customer in another state, which state's resale certificate do they need? Here's the rule and common exceptions.
When a sales-tax auditor asks for proof of exemption and you can't produce it, the state assumes tax was due. Here's what that looks like and how to avoid it.