ADDISON OneClick Buchhaltung is a cloud collaboration portal that connects German tax advisory firms with their clients to collect and capture documents, exchange banking and cashbook data in GoBD-oriented workflows, and synchronize bookkeeping data back into the ADDISON Finanzbuchhaltung back-office.
Published May 16, 2026
| Starting Price | Quote-based / bundled (not publicly listed) | Published via DATEV price lists and partner documents; varies by components | Public list price ranges depending on tier |
| Best For | ADDISON-based tax firms needing a Mandantenportal and integrations | DATEV-centric firms and clients wanting the de facto standard portal | SMBs seeking self-serve cloud bookkeeping and invoicing with transparent pricing |
| Key Strength | Integration with the ADDISON suite, portal features, and partner integration options | Wide adoption in the German tax advisor market and deep integration with the DATEV back office | SMB-focused UX and predictable self-serve pricing |
| Key Weakness | Public documentation on security certifications and pricing is limited; mixed user perceptions on automation and UI | Complexity and ecosystem lock-in concerns for some firms | Not a full tax-firm suite; may require connectors for Kanzlei-grade workflows |
Where ADDISON OneClick is competitive:
Where competitors can excel:
Market share/adoption trends: Public trade commentary and older articles provide indicative figures about market positions; these should be treated as commentary rather than audited market data.