Germany is an accountant-driven market. SMEs trust their Steuerberater on compliance, payroll, statutory reporting and the tools around DATEV. Product websites that speak only to CFOs miss the person who actually recommends software, implements the first Mandant and sits in the Betriebsprüfung when something looks wrong.
That channel matters even more as e-invoicing hardens. Receipt is already mandatory. Issuance from 2027 turns every mid-market client conversation into a question about inbound and outbound documents, not only about OCR on payables. The mandate guide at /e-rechnung covers the legal timeline; this piece covers who decides the stack.
Win the Kanzlei, or you do not win Germany
A single active Steuerberater firm can refer dozens of SME clients who already trust the recommendation. A marketplace listing or a tech-partner lead is useful later. The day-to-day distribution path is still the advisor who closes the books. Cortena is built to sit under that relationship, not to replace it on the client desk.
What the firm needs to see before it recommends
- One Mandant live first, so coding quality is visible before a wider rollout.
- Rules per client chart of accounts, not a one-size export that the Kanzlei has to repair.
- Incoming e-invoices (XRechnung, ZUGFeRD) coded on payables.
- Outgoing ZUGFeRD EN 16931 hybrids from receivables when the client must issue.
- A booking-ready DATEV batch via Rechnungsdatenservice 1.0.
- A GoBD-aligned trail the Betriebsprüfung can follow, with the original document linked.
E-invoice makes month-end advice sharper
When clients still drip PDFs into a shared mailbox, the Kanzlei spends hours reconstructing what should have been structured data. When clients issue non-compliant PDFs into 2027, the advisor inherits the cleanup. A bookkeeping layer that receives on AP and issues on AR reduces that cleanup without taking the advisory relationship away.
Peppol send and XRechnung B2G delivery are on the near-term roadmap and available soon. Until then, ZUGFeRD EN 16931 covers the common B2B issuance path, and receipt still has to handle XRechnung profiles cleanly. Both belong in the same tool the firm can stand behind.
Keep the relationship with the Kanzlei
Cortena is the bookkeeping layer under the firm: capture, code, issue, approve, DATEV handoff. Clients deal with the Kanzlei. Partners can start with one Mandant at no cost, keep review and sign-off inside the firm, and expand only when the batch quality is trusted.
See the accounting firms page for the Mandanten workspace story, the Steuerberater track on Partners for referral conversations, and the E-Rechnung guide when the e-invoice mandate is the topic of the next client meeting.