Free, browser-based tools from Sales Tax Compliance USA, built for international ecommerce sellers navigating U.S. sales tax obligations. No login, no software install, no data leaves your browser. Built by Paul le Roux, Chartered Accountant (ICAEW & CA(SA)).
Free U.S. Sales Tax Nexus Calculator
Enter your per-state U.S. revenue and FBA inventory locations. Get an instant list of every state where you must register for sales tax in 2026 — with the registration urgency for each.
Takes 60 seconds. No login. No software.
What the calculator does
- Economic nexus check across all 45 U.S. states with sales tax + D.C. — using current 2026 thresholds (including state-by-state changes through May 2026).
- Physical nexus check based on your Amazon FBA inventory locations — high-, medium- and low-concentration warehouse states pre-flagged.
- Marketplace-aware logic — the calculator correctly handles states where marketplace-facilitated sales count toward your own threshold (Texas, California, New York) vs states where they don’t (Washington, Arizona, Pennsylvania, Florida).
- AND-logic states — New York and Connecticut, where you have to cross both revenue and transaction thresholds to trigger nexus.
- Urgency tiering — registration-required (red), watch-zone (yellow), clear (green). Sortable, scannable, actionable.
- Email yourself the report — your full results delivered to your inbox, with a 6-step roadmap tailored to your nexus footprint.
Who it’s for
Built specifically for non-U.S. ecommerce sellers:
- Amazon FBA sellers based in South Africa, the UK, the EU, India, Australia, Canada
- Shopify direct-sale operators selling into the United States
- Walmart Marketplace, Etsy, eBay and TikTok Shop sellers with cross-border exposure
- U.S.-bound sellers who are not yet sure where they have to register
Want more depth than the calculator gives?
Every result the calculator surfaces is backed by a deeper pillar guide. Start with the cornerstone:
- U.S. Sales Tax for Foreign Sellers — The Definitive 2026 Guide (12,000 words; the hub)
- South Dakota v. Wayfair Explained
- Economic Nexus Thresholds — Full 2026 State-by-State Table
- 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
Don’t want to handle this yourself?
Sales Tax Compliance USA handles U.S. sales tax compliance for international ecommerce sellers end to end. EIN setup, multi-state registration, ongoing filings and remittance, marketplace reconciliation, audit defence — one fixed monthly fee, no software for you to learn.
More tools coming
This is the first tool in a planned series. Subscribe via the calculator’s email-yourself-the-report form to be notified when the following launch:
- Historical Exposure Calculator — estimate your back-tax + penalty + interest exposure across all states where you should have registered.
- Voluntary Disclosure Agreement (VDA) Estimator — model the savings from a VDA vs walking-in cold to a state DOR.
- Multi-State Filing Cost Estimator — annual cost of self-filing vs done-for-you compliance.