ArrayGator

Google’s Product rich-results guidelines require that the price in your product schema match the price shown to users. 
When WooCommerce is set to “Prices entered excluding tax” this isn’t the case—schema shows the net figure while the shop shows the gross.
Price Schema VAT Fixer plugs that gap:
<ul>
<li>Overrides the WooCommerce structured-data filter (<code>woocommerce_structured_data_product</code>) and injects the correct gross price.</li>
<li>Lets you define a tax-lookup address distinct from the store base location when your shop’s physical location differs from the VAT regime you charge.</li>
<li>No templates touched, no extra database tables.</li>
</ul>
Built for merchants who care about SEO, compliance, and clarity.

Price Schema VAT Fixer

Fixes WooCommerce JSON-LD so product schema shows the same VAT-inclusive price shoppers see.

moloni

With this plugin you can add VAT and VIES support to your WooCommerce store. The VAT field will be saved as ‘_billing_vat’.
Important: this plugin requires WooCommerce 3.0.0 or higher. 
Warning: to enable and use VIES information you need to have SOAP extension enabled (SoapClient PHP class).
<h3>Features</h3>
<ul>
<li>Adds VAT field to billing form.</li>
<li>Adds VAT field to outgoing email.</li>
<li>Adds VAT field to checkout billing information.</li>
<li>Adds VAT field to admin orders page.</li>
<li>Change VAT field label and description.</li>
<li>Validate Portuguese VAT numbers.</li>
<li>Choose how to handle vat field validation errors.</li>
<li>You can make VAT field required.</li>
<li>You can add VIES information to admin order page, checkout and user billing page.</li>
<li>Adds settings page under WooCommerce menu so you manage all the features.</li>
</ul>
<h3>Translations</h3>
<ul>
<li>English.</li>
<li>Portuguese.</li>
</ul>

Contribuinte Checkout

With this plugin you can add VAT and VIES support to your WooCommerce store. The VAT field will be saved as '_billing_vat'.

Price Schema VAT Fixer vs Contribuinte Checkout