Where to add VAT code in Order Printer Invoice Template?

How to add VAT to products on Order Printer Invoice Template.

Shopify Support sent me code but weren’t sure where it needs adding within the Invoice Template

code sent by Shopify

{% if order.billing_address.country_code == ‘GB’ %}

{{ line_item.pre_tax_price | times: 0.2 | money_with_currency }}

{% endif %}