Serve more Mandanten. Not more keying.
Your firm grows one client at a time, but the invoice keying grows faster. Cortena reads and pre-codes every client's incoming invoices, then hands you a batch that posts straight into DATEV. You review, you sign off, you keep the relationship.
One firm, many clients · Booking-ready export to DATEV via Rechnungsdatenservice 1.0
Every Mandant, in one place.
Cortena runs a workspace per client with its own chart of accounts, cost centres and approval rules. Invoices route themselves to the right entity from a single firm mailbox, so nobody sorts attachments by hand.
- 1One inbox for the whole firmClients forward invoices to a single Cortena address, or you drop PDFs and e-invoices in yourself.
- 2Routed to the right MandantRoot-mailbox rules match each document to its client entity by sender, domain or forwarding address.
- 3Coded to that client's booksEach Mandant keeps its own SKR chart, cost centres and BU keys. Rules inherit, so a new client starts from a template, not a blank page.
Entries arrive coded. You review, not re-key.
Cortena codes every line against the client's own chart of accounts and BU keys, then exports a booking-ready batch into DATEV through the official Rechnungsdatenservice 1.0. What lands in DATEV Unternehmen online is ready to post, with the source document attached to each entry.
| Supplier | Account | BU | Amount |
|---|---|---|---|
| Hetzner Online GmbH | 6837 | 9 | €197,42 |
| WeWork Germany GmbH | 6310 | 9 | €2.150,00 |
| DHL Paket GmbH | 6800 | 9 | €142,60 |
| Bürobedarf Kessler GmbH | 6815 | 9 | €248,71 |
| Stadtwerke Leipzig GmbH | 6325 | 9 | €412,88 |
- Coded per line. GL account, cost centre, BU tax key and payment terms, on the client's own SKR chart.
- Booking-ready, not draft. Delivered through the official DATEV Rechnungsdatenservice 1.0 into DATEV Unternehmen online.
- Document attached. The original invoice travels with the entry, so the archive stays complete inside DATEV.
You stay in control. Nothing posts without your sign-off, and Cortena learns from every correction so the next batch needs fewer.
You are the advisor. Cortena is the layer underneath.
Cortena does the bookkeeping so your team spends its hours on advice, not data entry. The client sees your firm, your judgement and your name. We stay in the background.
Your firm stays in front
Clients deal with you, not with us. Cortena is the engine behind your service, not a competing product on their desk.
Coded to your standards
Your firm sets the chart of accounts, the cost-centre logic and the approval matrix per client. Cortena applies them and explains every field.
More clients, same team
The keying that capped how many Mandanten one bookkeeper could carry moves to Cortena. Your people take on the review, and the exceptions.
Onboard clients onto Cortena under your firm, with shared billing, pooled onboarding and a single point of contact. Built for Kanzleien that want a bookkeeping layer they can stand behind.
A GoBD-aligned trail behind every entry.
When the auditor asks how a figure came to be, the answer is one click away. Cortena logs every capture, every code, every approval and every export, unchangeably, per invoice.
- Complete, timestamped history per document
- Original invoice linked to its booking entry
- Export receipts back to DATEV, on record
Cortena helps you work GoBD-konform. The archive of record stays in DATEV, and Cortena keeps the full processing trail alongside it. GoBD-aligned, never certified.
The trusted advisor. The missing execution layer. Finally together.
The case for Cortena in a Kanzlei
For Steuerberater and Kanzleien.
Cortena exports booking-ready entries through the official DATEV Rechnungsdatenservice 1.0 into DATEV Unternehmen online. Each entry carries its GL account, BU tax key, cost centre and the original document. Your team reviews the batch, then it posts. The archive of record stays in DATEV.
Yes. Cortena runs a separate workspace per client, each with its own chart of accounts, cost centres and approval rules, all under one firm login. A root mailbox routes incoming invoices to the right client automatically, so your team never sorts attachments by hand.
Yes. Cortena stays in the background as your bookkeeping layer. Clients deal with your firm, your rules and your judgement. For firms that want to onboard clients under their own name, the partner programme adds shared billing and pooled onboarding.
Cortena logs every capture, code, approval and export per invoice, unchangeably, with the source document linked to each entry. That helps your firm work GoBD-konform. The trail sits alongside the DATEV archive of record. Cortena is GoBD-aligned, not GoBD-certified.
Most clients are live in about 15 days, and setup takes minutes once the chart of accounts and rules are confirmed. New Mandanten start from a template rather than a blank page, so the second client is faster than the first. Onboarding support is included.
- Still have a question?
Take on more clients, not more keying.
Book a demo and bring one client's invoices. We will show you the coded batch landing in DATEV, on their real numbers.
Book a demo