Image credits

All photos come from free sources (Wikimedia Commons, Openverse) and are used under the licences listed. Charts and diagrams are our own.

• German invoice requirements: the 10 mandatory details: Tentsposy, CC BY-SA 4.0
• Small amount invoice in Germany: receipts up to €250: Kanesue, Public domain
• Kleinunternehmer invoice: what to write since 2025: Photo: Andreas Praefcke, Public domain
• Reverse charge invoice in Germany: wording and deadlines: Andersen Pecorone, CC BY 2.0
• E-invoicing in Germany: who must comply and when: Håkan Dahlström from Malmö, Sweden, CC BY 2.0
• XRechnung vs ZUGFeRD: which German e-invoice format?: Farzad Nazifi euwars, CC0
• Receive e-invoices in Germany: open, check and store XML: Mozzihh, CC BY-SA 4.0
• How long to keep invoices in Germany: 8 years since 2025: Shixart1985, CC BY 2.0
• Cancel an invoice in Germany: Storno and correction: Alex Morfin, CC BY-SA 3.0
• Gutschrift vs credit note: a German false friend: Axisadman, CC BY-SA 3.0
• Invoice number rules in Germany: formats and examples: Reinhard Kirchner, CC BY-SA 3.0
• Unpaid invoice in Germany: reminders, interest, deadlines: Martin Vorel, Public Domain