The scope of the legally required information in the invoice of a small business is primarily determined by tax law and § 14 UStG . Here you will find a free sample invoice for small businesses in accordance with § 19 UStG with all the necessary information:
The special thing about the invoice from the small business owner is that no sales tax is shown, neither a sales tax rate nor a sales tax amount. Since the small business owner is not entitled to show sales tax, there is no information on this. Instead, there is a note on the invoice that no sales tax is shown due to the application of the small business regulation .