Record retention requirements vary by state, but most jurisdictions require you to maintain sales tax documentation for a minimum of three to four years. Some states mandate retention periods as long as six or seven years from the filing date. The safest approach is to keep records for at least four years to cover the majority of state requirements.

Your retention obligation begins from the date you file your return or the due date, whichever is later. If you never filed a required return, the statute of limitations may never expire in some states, meaning you should retain those records indefinitely. In audit situations, having comprehensive records readily available demonstrates good faith compliance.

Consider keeping digital copies stored securely in cloud systems for easy retrieval. Important documents to preserve include sales invoices, exemption certificates, state returns filed, and marketplace facilitator reports from Amazon. Establishing an organized filing system from the start prevents scrambling during potential audits.