Sales Tax for Multi-State Ecommerce – 2026 Guide to Nexus, Marketplaces, and Filings

Nexus rules keep expanding. If you sell across states, you must know where you have physical or economic nexus, how marketplaces collect, and what you still must file.

Nexus basics

Physical nexus (warehouses, staff) and economic nexus (revenue/transaction thresholds). Track thresholds monthly.

Marketplaces

Amazon/Shopify may collect in some states, but you still file and reconcile. Avoid double-collecting.

Filings and cadence

Register where required, automate returns, and reconcile marketplace reports to your books.

FAQs

What is sales tax nexus for ecommerce sellers?
Sales tax nexus is your business’s obligation to collect and remit sales tax in a state based on physical presence, economic thresholds, or marketplace activity.

How do marketplaces like Amazon and Shopify handle sales tax?
Most major marketplaces collect and remit sales tax on your behalf, but you are still responsible for tracking nexus, registering where required, and filing returns when applicable.

How can I stay compliant when selling in multiple states?
Monitor where you meet economic nexus thresholds, register in those states, track marketplace filings, and use software or bookkeeping support to manage multistate filings.

See our ecommerce bookkeeping options and monthly filings support, and explore our bookkeeping services if you need more help.

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