Ever-changing sales tax laws, shifting economic nexus thresholds, and emerging payment methods continue to complicate matters for online sellers—especially as 2025 brings additional changes in states’ rules and enforcement practices. If you’re wondering how taxes work with ecommerce, this updated guide will help you learn about sales tax obligations for small business owners selling online.
We’ll cover everything from establishing a sales tax nexus (economic, physical, affiliate, and more) to handling BOPIS (Buy Online, Pick Up In-Store), BNPL (Buy Now, Pay Later) transactions, marketplace facilitator rules, and the latest 2025 updates that could affect your obligations. Let’s dive in!