WooCommerce Tax

The VAT in Switzerland works pretty much the same as in the EU. Except for the authorities in charge.

The Swiss government offers a service similar to the one you use to validate/verify EU VAT numbers. You can find the documentation here: https://www.bfs.admin.ch/bfs/en/home/registers/enterprise-register/enterprise-identification/uid-register/uid-interfaces.html

So it seems that it should be possible to extend your extension with Switzerland with the same functionality as you offer for the other European countries.

This could make this extension interesting for all Swiss companies doing business with customers in their neighbor countries.