Requirements for the use of invoice numbers in Switzerland and Germany
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In Switzerland, invoices do not need a number for tax purposes. See the article on the SME portal of the Swiss Confederation.
The invoice numbers are pre-formatted in Vertec via the Invoice/Money Note system settings.
In accordance with § 14 (4) sentence 1 no. 4 UStG, Germany requires consecutive invoice numbering. The consecutive number (invoice number) is intended to ensure that the invoice issued by the entrepreneur is unique.
However, a complete sequence of this invoice number is not mandatory, according to the VAT Application Decree (search for invoice numbers in the document):