In practice

Software, dunning, cancellations and credit notes day to day.

Cancel an invoice in Germany: Storno and correctionHow to cancel or correct an invoice in Germany: when a short correction is enough, what a Stornorechnung looks like, and what if you charged too much VAT.
Gutschrift vs credit note: a German false friendGutschrift vs credit note: in German VAT law a Gutschrift is a self-billed invoice, not a credit note. What must be on it, how to object, why it matters.
Invoice number rules in Germany: formats and examplesInvoice number rules in Germany: unique and sequential, but gaps are allowed. Which formats work, when separate number ranges are fine, and who needs no number.
Unpaid invoice in Germany: reminders, interest, deadlinesUnpaid invoice in Germany: when the client is in default, 10.52 % B2B late payment interest since July 2026, the €40 flat fee and what expires in 2026.