Law and data protection
UStG
Abbreviation for Umsatzsteuergesetz
In short and in plain language
The UStG is the German law on sales tax.
It sets out how goods and services are taxed.
It also has rules on invoices and on how to issue them.
How it applies in your case is a matter for tax advice.
Definition
The UStG is the German VAT Act. It governs the taxation of supplies and services and contains provisions on invoices and invoicing. How it applies in an individual case is a matter for tax advice.