How HSP GRUPPE builds AI capabilities for tax advisory

Why it matters

OpenAI has published a case study describing how HSP GRUPPE, a European network of independent tax advisory, auditing, and law firms, embedded ChatGPT Enterprise into its operations alongside Kanzleipakt. The firm treats AI not as a productivity add-on but as part of its operating model, applying it to tax advisory, legal research, client communication, financial analysis, and knowledge sharing. Leadership framed the effort as organizational transformation rather than software deployment, supported by monthly AI forums, governance rules, and mandatory professional review of AI-assisted output. Successful use cases were standardized into shared custom Agents, including one for drafting client communications and another for preparing and classifying booking questions, with final decisions always resting with qualified professionals. Individual staff describe using ChatGPT as a sparring partner for complex tax questions and for faster preparation of investment analyses. The organization is now piloting ChatGPT Work to explore agentic workflows, emphasizing that saved time is redirected to client advisory and shorter turnaround rather than headcount reduction.