Five schemes, chosen once.
§ 25a Differenzbesteuerung, Regelbesteuerung, § 13b Reverse Charge, § 6 Ausfuhr, Kleinunternehmer. The scheme is set when you buy the piece and honoured on every document after it, which is why it stops being something you think about.
No gaps, no reuse, no renumbering after the fact. The sequence is the first thing a tax inspector reads.
One watch. Three buyers. Three different documents.
The same piece, sold three ways. Change the buyer and watch the scheme, the totals and the mandatory wording change with it. This is the part that goes wrong by hand, and the part your tax advisor will check first.
A finalised invoice cannot be edited. Try it.
Gapless numbering, and no back door. The only way to undo a finalised document is a cancellation document that carries its own number and points at the original. That is not a limitation, it is the requirement.
Your paper, not ours.
One document set across invoices, purchase agreements, offers and credit notes. Choose a template, set your accent, put your name on it. Every document type follows.
Logo left, address block right, thin rules. What most tax advisor expect to see.
80539 München
The month closes itself.
Every document issued this month, sorted, packaged in the format your tax advisor already imports, and sent. On a schedule you set once. The month-end evening you are used to does not happen.
One file. A document for him, data for his software.
Every invoice leaves as a ZUGFeRD PDF: the page a human reads, with the structured record embedded inside the same file. His accounting system imports it without anyone retyping a number.