Title: VIESAC – Free VAT Validation for WooCommerce
Author: viesac
Published: <strong>June 5, 2026</strong>
Last modified: June 5, 2026

---

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# VIESAC – Free VAT Validation for WooCommerce

 By [viesac](https://profiles.wordpress.org/viesac/)

[Download](https://downloads.wordpress.org/plugin/viesac.1.0.4.zip)

 * [Details](https://xho.wordpress.org/plugins/viesac/#description)
 * [Reviews](https://xho.wordpress.org/plugins/viesac/#reviews)
 *  [Installation](https://xho.wordpress.org/plugins/viesac/#installation)
 * [Development](https://xho.wordpress.org/plugins/viesac/#developers)

 [Support](https://wordpress.org/support/plugin/viesac/)

## Description

VIESAC adds free VAT validation to WooCommerce checkout. It validates EU, Norwegian,
Swiss, and Northern Ireland VAT numbers and stores VIESAC certificates for audit-
ready B2B orders.

#### Features

 * **Free unlimited VAT validation** – Validate VAT numbers at WooCommerce checkout
 * **15 VIESAC audits per month** – Full audits with VIES certificate storage
 * **Lifetime storage** – VIES certificates stored permanently
 * **EU VIES compliance** – VAT number validation for EU businesses
 * **B2B tax exemption** – Automatic WooCommerce tax removal when VAT is valid
 * **Certificate download** – PDF certificate available in order details
 * **Company and VAT fields** – Adds company name and VAT number fields to checkout
 * **Checkout blocks support** – Works with WooCommerce Blocks
 * **HPOS compatible** – Compatible with WooCommerce Custom Order Tables

#### Supported countries

All EU member states plus Northern Ireland (XI), Norway (NO), and Switzerland (CH).

#### Getting started

 1. Install and activate the plugin.
 2. Go to WooCommerce -> VIESAC.
 3. Get your free API key from [https://viesac.eu/app/api](https://viesac.eu/app/api).
 4. Enter the API key and save.

#### Languages

VIESAC is available in 25+ languages: English, German, French, Spanish, Italian,
Polish, Dutch, Romanian, Greek, Czech, Swedish, Hungarian, Portuguese, Bulgarian,
Danish, Finnish, Slovak, Croatian, Latvian, Estonian, Lithuanian, Slovenian, Russian,
Turkish, Arabic, Ukrainian.

### External services

This plugin connects to the VIESAC API to validate VAT numbers, retrieve account
usage information, and optionally create audit records with certificate storage.

It sends data to `https://viesac.eu` only when a store administrator enters an API
key and the plugin performs one of these actions:

 * VAT validation and audit creation via `https://viesac.eu/api/v1/audits`
 * Account and usage lookup via `https://viesac.eu/api/v1/account`

Depending on the action, the plugin may send:

 * VAT country code and VAT number
 * Company name
 * Company address
 * Order number
 * Order audit details in XML format for certificate generation

Service provider documentation:

 * Privacy Policy: [https://viesac.eu/privacy-policy](https://viesac.eu/privacy-policy)
 * Terms of Service: [https://viesac.eu/terms-of-service](https://viesac.eu/terms-of-service)

## Screenshots

 * [[
 * WooCommerce order page with verified VAT status and VIESAC certificate download
   button
 * [[
 * VIESAC configuration page for API key and audit usage
 * [[
 * WooCommerce checkout with company name, VAT number, and tax-exempt B2B total

## Installation

 1. Upload the plugin files to `/wp-content/plugins/viesac/`, or install the plugin
    through the WordPress plugins screen directly.
 2. Activate the plugin through the `Plugins` screen in WordPress.
 3. Ensure WooCommerce is installed and active.
 4. Go to WooCommerce -> VIESAC and enter your API key from [https://viesac.eu/app/api](https://viesac.eu/app/api).

## FAQ

### Do I need to pay?

VAT validation is free. You get 15 VIESAC audits per month (full audits with certificate
storage) free of charge. Paid plans offer more audits.

### What is an audit?

An audit is a full validation that creates and stores a VIES certificate for the
order. VAT number checks at checkout are unlimited and free.

### Does it work with WooCommerce Blocks?

Yes. VIESAC is compatible with WooCommerce Blocks checkout.

## Reviews

There are no reviews for this plugin.

## Contributors & Developers

“VIESAC – Free VAT Validation for WooCommerce” is open source software. The following
people have contributed to this plugin.

Contributors

 *   [ viesac ](https://profiles.wordpress.org/viesac/)

“VIESAC – Free VAT Validation for WooCommerce” has been translated into 1 locale.
Thank you to [the translators](https://translate.wordpress.org/projects/wp-plugins/viesac/contributors)
for their contributions.

[Translate “VIESAC – Free VAT Validation for WooCommerce” into your language.](https://translate.wordpress.org/projects/wp-plugins/viesac)

### Interested in development?

[Browse the code](https://plugins.trac.wordpress.org/browser/viesac/), check out
the [SVN repository](https://plugins.svn.wordpress.org/viesac/), or subscribe to
the [development log](https://plugins.trac.wordpress.org/log/viesac/) by [RSS](https://plugins.trac.wordpress.org/log/viesac/?limit=100&mode=stop_on_copy&format=rss).

## Changelog

#### 1.0.4

 * Add Norway and Switzerland VAT validation support
 * Add WordPress.org plugin icons, banner, and screenshots
 * Sharpen readme copy around free VAT validation, VAT number checkout fields, B2B
   tax exemption, and certificate storage

#### 1.0.3

 * Clean up WordPress.org scanner issues without changing checkout behavior
 * Add missing plugin translations for Company name fields across all bundled locales
 * Rebuild translation files for verified runtime loading in WordPress
 * Harden admin output escaping and checkout/order input sanitization
 * Normalize plugin file line endings and refine PHPCS-safe request handling in 
   checkout/order flows

#### 1.0.2

 * Add best-effort fallback VAT field injection for custom WooCommerce checkout 
   themes
 * Re-inject VAT field after checkout AJAX updates and DOM re-renders
 * Improve compatibility with custom theme checkout wrappers such as Avada-style
   layouts
 * Keep WooCommerce Blocks behavior separate from classic/custom theme fallback 
   logic

#### 1.0.1

 * Update text domain and WordPress compatibility metadata
 * Add WooCommerce dependency header
 * Document external API service usage for WordPress.org review
 * Clean plugin copy for UTF-8 safe packaging

#### 1.0.0

 * Initial release
 * VAT validation at checkout
 * 15 free VIESAC audits per month
 * VIES certificate download
 * Admin settings page
 * 25+ language translations

## Meta

 *  Version **1.0.4**
 *  Last updated **2 days ago**
 *  Active installations **Fewer than 10**
 *  WordPress version ** 5.9 or higher **
 *  Tested up to **6.9.4**
 *  PHP version ** 7.2 or higher **
 *  Languages
 * [English (US)](https://wordpress.org/plugins/viesac/) and [Russian](https://ru.wordpress.org/plugins/viesac/).
 *  [Translate into your language](https://translate.wordpress.org/projects/wp-plugins/viesac)
 * Tags
 * [b2b](https://xho.wordpress.org/plugins/tags/b2b/)[tax](https://xho.wordpress.org/plugins/tags/tax/)
   [vat](https://xho.wordpress.org/plugins/tags/vat/)[vies](https://xho.wordpress.org/plugins/tags/vies/)
   [woocommerce](https://xho.wordpress.org/plugins/tags/woocommerce/)
 *  [Advanced View](https://xho.wordpress.org/plugins/viesac/advanced/)

## Ratings

No reviews have been submitted yet.

[Your review](https://wordpress.org/support/plugin/viesac/reviews/#new-post)

[See all reviews](https://wordpress.org/support/plugin/viesac/reviews/)

## Contributors

 *   [ viesac ](https://profiles.wordpress.org/viesac/)

## Support

Got something to say? Need help?

 [View support forum](https://wordpress.org/support/plugin/viesac/)