US Sales Tax Guide for E-commerce 2026: Economic Nexus, Registration & Filing
The United States has no nationwide unified consumption tax, with sales tax regulated independently by each individual state. Varied tax rates, registration thresholds and filing rules leave many cross-border sellers confused about where to begin. This article breaks down the core rules of US sales tax: the definition of Nexus, registration-triggering scenarios, the differences in tax compliance between DTC stores and Amazon, as well as detailed tax rate configuration methods for Shopify and WooCommerce.