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② 後台搜尋「Keystep EU VAT Suite for WooCommerce」→ 直接安裝（推薦）
原文外掛簡介
Keystep EU VAT Suite makes your WooCommerce store charge the correct EU VAT on every order, automatically.
Correct destination VAT for B2C customers across all 27 EU member states, based on the customer’s billing country.
B2B reverse-charge — EU business VAT numbers are validated against the official VIES service and zero-rated when valid.
Resilient at checkout — if the VIES service is slow or unavailable, checkout still completes: the order is charged standard VAT and flagged for your review, so a sale is never lost and an unverified number is never silently zero-rated.
Block and classic checkout — the VAT-number field is registered through WooCommerce’s Additional Checkout Fields API, so it appears in both.
HPOS-compatible — works with WooCommerce High-Performance Order Storage.
Coexists with your tax setup — it adds the EU standard rates that are missing and never overwrites rates you have already configured. Reduced-rate products use WooCommerce’s own Reduced-rate tax class, which you configure.
This plugin is a calculation and compliance tool. You remain responsible for your own VAT registration and filings.
Pro add-on
OSS return reporting, the EUR 10,000 distance-selling threshold tracker, and audit CSV export are available in a separate Keystep EU VAT Suite Pro add-on, distributed from https://shasan7774.github.io/eu-vat-suite/ and not hosted on WordPress.org. The free plugin above is fully functional on its own.
External services
To apply B2B reverse-charge correctly, this plugin validates EU business VAT numbers against VIES (the VAT Information Exchange System), an official service operated by the European Commission.
When it is called: only when a customer enters a VAT number at checkout. Results are cached to minimise repeat calls, and the service is never contacted for consumer (B2C) orders.
What is sent: the VAT number the customer enters, together with its two-letter country code. No name, address, order contents, or other personal data is transmitted.
Why: to confirm the VAT number is genuine so a valid EU business can be correctly zero-rated under the reverse-charge rules.
Provider: European Commission — VIES. Service, terms and legal/disclaimer information: https://ec.europa.eu/taxation_customs/vies/
The plugin contacts no other third-party services.
