Mandatory details

What every invoice must contain, and what applies in special cases.

German invoice requirements: the 10 mandatory detailsGerman invoice requirements under § 14 UStG explained in English: ten mandatory details, a sample invoice, and the mistakes that get invoices sent back.
Small amount invoice in Germany: receipts up to €250Small amount invoice in Germany: receipts up to €250 gross need only four details. How to claim the VAT, which slips do not count, and when the rule fails.
Kleinunternehmer invoice: what to write since 2025Kleinunternehmer invoice in English: six details under § 34a UStDV, the exemption note, the €25,000 and €100,000 limits and why no e-invoice is needed.
Reverse charge invoice in Germany: wording and deadlinesReverse charge invoice from Germany: the required note, both VAT IDs, the deadline on the 15th of the next month, and what applies to UK or US clients.