Audits

What Triggers a Sales Tax Audit for Online Sellers Key Takeaways Common audit triggers for online sellers include nexus created by inventory (including FBA), mismatched marketplace data, and sharp swings in reported taxable sales. States often start audits after comparing sales tax returns to income tax filings, 1099-K totals, marketplace facilitator reports, and shipping destination

Key Takeaways Drop shipping audits most often start with missing or invalid resale/exemption certificates, especially when the seller can’t prove “who is the retailer” in each transaction. State auditors look for mismatches between marketplace facilitator reports, sales tax returns, and your books—small variances can trigger a deeper review. Economic nexus thresholds and “marketplace collected tax”

Key Takeaways Most sales tax audits are triggered by mismatched returns, unusual exemption activity, and late or inconsistent filing patterns. Common red flags include high exempt sales without valid certificates, taxable services treated as non-taxable, and multi-state nexus mistakes. Good records reduce audit exposure: reconcile to bank deposits, retain exemption certificates, and document taxability decisions.

Key Takeaways Respond fast: most sales tax audit notices have a firm reply date (often 30 days) and missing it can trigger estimated assessments. Reconcile every channel: marketplace, Shopify/Amazon/eBay reports, payment processor deposits, and general ledger should tie out to the penny. Prove exemptions: keep resale and exemption certificates organized by state and customer; missing

Who This Guide Is For: Amazon FBA sellers and ecommerce business owners who collect sales tax in multiple states and want a practical, 2026-ready playbook for preparing for, responding to, and closing a sales tax audit tied to marketplace and fulfillment activity. Key Takeaways Amazon’s marketplace tax collection does not eliminate audit risk; auditors often