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Tax & Accounting for Retail & E-commerce

Inventory, multi-state sales tax nexus, and marketplace facilitator rules are the three pain points for most e-commerce operators.

Katie Gorles
Written by
Katie Gorles
Updated April 22, 2026

Inventory accounting

Most online sellers need to maintain inventory on the balance sheet: FIFO or specific-identification for most. Cash-basis doesn't exempt you from the inventory requirement when gross receipts exceed the small-business threshold.

Multi-state sales tax nexus

Economic nexus typically triggers at $100,000 in sales or 200 transactions per state. FBA sellers have additional physical-nexus exposure in every state Amazon stores their inventory.

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Marketplace facilitator rules

Amazon, Etsy, eBay, and similar platforms collect and remit sales tax on your behalf in most states. You still owe on direct-to-consumer and wholesale sales outside the platform. Getting this wrong creates double-filing or missed filings.

Common questions

Do I need to register in every state Amazon stores my inventory?
Historically yes. Many states have softened this post-Wayfair, but registration is still advisable in major FBA warehouse states.

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