Germany’s finance ministry issues e-invoicing guidance ahead of 1 January 2027

What the German finance ministry clarified

Germany’s Federal Ministry of Finance (BMF) has published supplementary guidance on its e-invoicing reform in a letter dated 15 October 2026, as reported by VATupdate on 12 November 2026. The statutory timetable stays as it was. From 1 January 2027, the obligation to send structured e-invoices for covered domestic business-to-business sales generally applies to businesses whose turnover in the previous year exceeded €800,000. The rest of the businesses within scope generally join them a year later, on 1 January 2028. The obligation to receive e-invoices began in 2025.

The letter is mostly about invoice content. Mandatory VAT information must sit in the structured data and describe the supply well enough to decide its VAT treatment. Attachments such as timesheets can add detail but cannot replace required fields, so a complete PDF next to an incomplete XML file is not enough. A warning raised by a technical validation rule does not by itself mean an invoice stops being valid; errors in mandatory VAT information still matter legally. The guidance also covers advance and final invoices, corrections, customer-status checks for mass-market sales and targeted transitional relief.

Which businesses need to act

The mandate covers domestic B2B transactions in Germany. If your business or a subsidiary invoices German business customers within Germany and had turnover above €800,000 last year, your invoicing system generally needs to produce compliant structured invoices from 1 January 2027. Smaller in-scope businesses have until 2028, subject to exemptions and transitional rules.

The risk runs both ways. Defects in mandatory VAT information can jeopardise invoice validity or input VAT deduction, so customers have reason to check what you send. On incoming invoices, your accounts payable process needs to tell a harmless warning from an error that could cost you the deduction.

A business with no domestic German B2B sales is not covered by this phase. The source does not say how the rules treat non-German businesses registered for German VAT.

What to check before 1 January 2027

The guidance points to a set of practical checks:

• Confirm the issuance date for each entity that invoices in Germany.
• Have your finance team map German mandatory invoice information to EN 16931 business terms.
• Test XRechnung and qualifying ZUGFeRD files on realistic cases: payments taken in advance and the final invoice that follows, reverse-charge and VAT-exempt sales within Germany, credit notes, construction work and invoices that carry supporting documents.
• Test correction workflows, and keep the original structured file and any corrections in a compliant archive.
• Set incoming-invoice validation so that warnings do not block processing but material legal defects are sent back for correction.

Where invoices are produced by an API integration between your store, ERP and accounting software, test that connection end to end, not only the invoicing tool. If those connections need changing, Cognivise’s API development and integration service can build and test them.