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Please note that this custom block have checked the “VAT reverse charge” setting. 
Hi @cutu234,
This is certainly possible with the customizer, included in the Premium Templates extension, which allows you to add custom blocks with a set-up like this:

Then, your PDF invoice will display the custom text if the VAT reverse charge condition is met, this way:

The VAT Reverse Charge option will be considered ‘true’ if all these conditions are met:
- The order is from a European Union country.
- Order total is greater than zero (0)
- The VAT of the order is equal to zero (0)
- The order has a VAT number (you should have a compatible plugin installed that collects the VAT number on the checkout page, e.g. EU/UK VAT Compliance Assistant for WooCommerce)
Please note that, since the rules for the WordPress.org forums doesn’t allow us providing premium support or answering pre-sale questions for paid plugins, please contact us by email to [email protected], if you have further questions.
