The mandatory details — and where they come from
Before ticking off a list: an invoice answers seven questions so that a third party understands the transaction years later without you — who issued it, to whom, when it was written, what was supplied, when it was supplied, how much and what tax, and which number it carries. You can put those seven questions to an invoice in any market. Which detail is mandatory, and from what amount a shorter list will do, is national.
As at 25.08.2026. This page is not legal or tax advice. The German provisions named above were checked at the statute on gesetze-im-internet.de and apply to Germany only; every other market has its own list with its own limits.