Free U.S. Sales Tax Nexus Calculator for International Sellers
Built for non-U.S. ecommerce sellers — from South Africa, the UK, the EU, India, Australia, Canada and anywhere else — selling into the United States through Amazon FBA, Shopify, Walmart, Etsy or TikTok Shop.
Enter your U.S. sales by state and your FBA inventory locations. The calculator returns the states where you have economic nexus (revenue-based) and physical nexus (inventory-based), using current 2026 thresholds, with the registration urgency for each.
Cost: free. No login. No software install. No data leaves your browser unless you choose to email yourself the report.
1 Enter your U.S. revenue
All figures in USD, covering your most recent 12-month trading period (or the relevant measurement window for the state). Per-state revenue gives the most accurate result.
In USD. Include all U.S.-bound sales across every channel — Amazon, Shopify, Walmart, Etsy, TikTok Shop and direct.
Marketplaces = Amazon, Walmart, Etsy, eBay, TikTok Shop. Everything else (your own Shopify, your own website, B2B invoiced) is "direct".
In Quick mode we distribute your U.S. revenue across all 50 states + DC in proportion to state population — a reasonable estimate when you don't have per-state data. For a precise read, switch to Detailed mode.
2 Mark every state where Amazon stores your inventory
Each FBA fulfillment-center state creates physical nexus regardless of how much you sell there. Most FBA sellers have inventory in 12-20 states without realising it.
How to find your FBA inventory states: Seller Central → Reports → Fulfillment → Inventory Event Detail. The "Fulfillment Center" column shows the warehouse code; the first two letters are the state (e.g., DFW7 = Texas, ONT8 = California, BFI4 = Washington).
High-concentration FBA states are highlighted. If you use FBA, assume inventory in at least 8-12 of these without active control.
State-by-State Results
Each card shows the threshold, your sales position, and what to do. Sorted: registration-required first, then watch-zone, then clear.
Don't want to handle this yourself?
We handle U.S. sales tax compliance for international ecommerce sellers end-to-end. EIN setup, multi-state registration, ongoing filings, marketplace reconciliation and audit defence — one fixed monthly fee, no software for you to learn.
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Get a copy of these results as a PDF — plus a 6-step compliance roadmap tailored to your nexus footprint. We'll add you to occasional emails about U.S. sales tax changes that affect cross-border sellers. Unsubscribe any time.
Internal Links — Dig Deeper
For more detail on any topic this calculator surfaced:
- U.S. Sales Tax for Foreign Sellers — The Definitive 2026 Guide
- South Dakota v. Wayfair Explained
- Economic Nexus Thresholds — State-by-State Guide
- Marketplace Facilitator Laws Explained
- How to Apply for a U.S. EIN as a Foreign Entity
- How to Open a U.S. Business Bank Account as a Non-Resident
- Amazon FBA Sales Tax for International Sellers