Record marketplace-collected sales tax as a liability that clears to zero, or as a pass-through memo line, not as income. Keep reports showing tax by jurisdiction. This avoids overstating sales, keeps margins meaningful, and supports questions from auditors who expect consistent, defensible treatment across months and channels.
For EU and UK shipments, confirm whether the marketplace uses IOSS or collects VAT at checkout. Reflect VAT as marketplace tax, not revenue. Store invoices with VAT numbers. Accurate classification streamlines cross-border returns and reduces frantic end-of-year scrambles when reconciling figures requested by customs or your accountant. Ceramicist Ana priced limited glazes confidently after switching to specific identification, and her margin variability shrank notably.
Track physical presence and economic thresholds per state. If you also sell at fairs or via your own site, you may need separate registrations. Maintain a simple spreadsheet of dates, sales amounts, and filing responsibilities. Proactive monitoring prevents costly notices and helps you budget realistic, calm cash flows.