- Open BillLitz → Custom.
- Set region name (e.g. Germany), currency EUR, tax label (VAT / MwSt / TVA / BTW).
- Create tax categories for the rates you use (standard, reduced, zero).
- Fill business VAT ID, client, and lines; assign categories per line.
- Download the PDF; keep a Backup export.
Deep hub: EU VAT (Custom). Same Custom pattern works for Canada GST/HST and Australia GST with different currency/labels.