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'.

Abhi

Many countries like Australia, Canada, Singapore and India use GST instead of VAT. This plugin automatically renames VAT and Tax labels to GST across your entire WooCommerce store.
Works everywhere: 
* Cart & Checkout pages 
* Order confirmation pages 
* Email notifications 
* Admin order pages 
* My Account pages
Features: 
* ✅ Zero configuration needed 
* ✅ Compatible with WooCommerce HPOS 
* ✅ Works with all WooCommerce themes 
* ✅ Lightweight and performant 
* ✅ Follows WordPress coding standards

Rename VAT to GST for WooCommerce

Replaces VAT and Tax terminology with GST throughout WooCommerce (emails, cart, checkout, admin, order pages).

Contribuinte Checkout vs Rename VAT to GST for WooCommerce