How HSP GRUPPE builds AI capabilities for tax advisory

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Tax professionals use ChatGPT Enterprise to process information faster, improve work quality, and create more capacity for advisory work and client service.

The usage figures in this story refer to the shared ChatGPT Enterprise workspace used by HSP GRUPPE and Kanzleipakt, covering 81 organizational groups. HSP GRUPPE itself is a network of legally independent tax advisory, auditing, and law firms.

For more than two decades, HSP GRUPPE⁠ has consistently invested in digitizing and standardizing professional firm processes. Long before generative AI, the firm network standardized processes, embedded quality management, and fostered a culture of continuous improvement across the network.

When ChatGPT emerged, HSP saw more than another productivity tool. It saw an opportunity to rethink how professional work itself could evolve.

Rather than asking how AI could help employees write faster emails or summarize documents, leadership asked a broader question: What happens when AI becomes part of the operating model of a professional services firm?

That vision led HSP to embed ChatGPT Enterprise into tax advisory, legal research, client communication, financial analysis, and knowledge sharing across the firm network.

HSP approached AI as an organizational transformation rather than a software rollout.

The organization introduced ChatGPT Enterprise with a strong focus on adoption, governance, and continuous learning. Monthly AI forums gave employees a place to share practical use cases and learn from one another. ChatGPT Enterprise’s security features provide an important technical foundation, while the use of client-related information is governed by HSP’s internal data protection, confidentiality, and governance requirements.

Professional review and final responsibility always remain with the relevant tax, legal, or accounting professional.

The goal wasn’t simply to encourage experimentation. It was to build an organizational capability that could scale.

As Carsten Schulz puts it: “People ask me what my favorite AI feature is. I never answer that question. Individual features don’t matter. Once you understand how everything fits together, AI opens the door to a completely new world.”

Across the firm network, professionals quickly found new ways to apply AI to their daily work, while the organization also began standardizing successful use cases into custom