"The AI for your tax return"
SteuerGPT is an AI-powered chatbot for tax-related questions within WISO Steuer. Users can ask questions in everyday language while completing their tax return; the AI explains matters, guides them to the appropriate input forms, suggests missing information, and helps them understand their tax assessment notice.
TaxGPT
SteuerGPT: Your digital advisor - The AI for your tax return
Origin: Germany ⓘ Buhl Data Service GmbH, Am Siebertsweiher 3/5, 57290 Neunkirchen (Siegerland), Germany.
Trial version: Complete testing before submission.
Note: No direct prices stated, as only model names and functions are documented here. Other Single purchase: One-time license for one tax year with SteuerGPT and filing option.
Optional additional services: ProfiCheck and buhl:Berater are offered separately via Buhl Steuerberatungsgesellschaft mbH; Buhl Data Service itself points out that it is neither obligated nor authorized to provide tax law assistance. CE: unclear
Target audience
SteuerGPT is primarily aimed at people who prepare their tax return themselves using WISO Steuer and need understandable help along the way. The tool is especially relevant for employees, retirees, families, students, career starters, self-employed individuals, and freelancers who want to clarify tax-related questions directly in the context of their return. For companies, SteuerGPT is only indirectly suitable, for example for owners or self-employed managing directors, but not as a full-fledged enterprise tax platform. According to the provider, WISO Steuer itself is positioned for beginners and professionals, employees, self-employed individuals, and retirees.
Outstanding features
SteuerGPT stands out because the AI does not operate as a general chatbot, but as an integrated tax assistant within WISO Steuer. The tool answers questions in everyday language, shows where information should be entered in the tax return, makes suggestions for missing information, and helps users understand the tax assessment notice. According to WISO, the answers are based on proven WISO tax content, are continuously reviewed, and are intended to make technical tax language easier to understand.
Main use cases
The main areas of use are answering tax questions, navigating input forms, optimizing the tax return, checking for potentially missing information, explaining tax terms, and translating explanations in the tax assessment notice into everyday language. In addition, WISO Steuer supports the entire tax return process through related features such as tax retrieval, tax box, receipt recognition, electronic ELSTER submission, and assessment notice review.
Usage & notes
It is used directly in WISO Steuer: users type their question into a chat window, SteuerGPT responds immediately and, if necessary, refers them to the appropriate sections of the tax return. It should be noted that, according to the provider, AI-generated answers may contain inaccuracies and do not replace advice from tax experts. From a data protection perspective, it is relevant that SteuerGPT can also process sensitive personal data; according to Buhl, this is done on the basis of consent, via Taxy.io as a data processor, and Microsoft Azure in German data centers.
| Target audience | Assessment |
|---|---|
| Private individuals | Yes – particularly suitable for employees, students, retirees, couples, and people with a standard income tax return. |
| Self-employed / freelancers | Yes – suitable when WISO Steuer is used for EÜR, business expenses, and tax returns; SteuerGPT helps with comprehension and input questions. |
| SMEs | Partly – more suitable for sole proprietors, small self-employed businesses, and private tax cases, not as a full-fledged corporate tax or accounting system. |
| Large enterprises | Rather no – SteuerGPT is geared toward individual tax returns within WISO Steuer, not enterprise tax compliance. |
| Developers / technical teams | No – no standalone API, no model access, no LLM deployment. |
| Privacy-sensitive private users | Yes, comparatively well suited – German provider, servers in Germany, and according to the provider no use of personal data by SteuerGPT. |
| Tax advisors / firms | Partly – helpful as an end-user tool, but not a firm workflow system and not a professional tax advisory platform. |
Hosting & Data
1) On-prem / local hosting
Meaning: The company operates the solution on its own hardware or within its own infrastructure. In the strictest sense, not only the application runs locally, but ideally the model as well.
2) Private cloud / data center
Meaning: The solution runs in a dedicated or more clearly separated cloud environment, often with a hosting provider or hyperscaler, but in a German data center or in a particularly controlled environment.
3) EU SaaS / managed
Meaning: The provider operates the solution itself as a service. The company uses the tool as a ready-made cloud service, ideally with EU data residency.
4) Hybrid
Meaning: One part of the processing remains internal / local / in a private cloud, while another part runs in an external cloud or EU SaaS.
5) AVV / DPA
Meaning: This is the data processing agreement or Data Processing Addendum. It governs that the provider processes personal data on behalf of the customer and is bound by the customer's instructions.
6) No training
Meaning: The provider does not use your prompts, uploads, attachments, chat histories, or outputs for training or improving the general model — ideally excluded by contract.
7) Open-source / transparency path
Meaning: There is a path toward greater technical transparency and sovereignty, for example through:
- open models
- documented components
- self-hostable parts
- traceable architecture
- export / switching options
| On-prem / local hosting | ❓ |
| Private cloud / data center | ⚠️ |
| EU SaaS / Managed | ✅ |
| Hybrid | ⚠️ |
| DPA / AVV | ✅ |
| No training on customer data | ⚠️ |
| Open source / transparency path | ❓ |
Overall assessment:
A Germany-hosted SaaS/app model within WISO Steuer, not standalone LLM hosting. SteuerGPT does not run as a separate AI product, but directly within WISO Steuer. The hosting model is therefore tied to WISO Steuer web/app/desktop: use via browser, app, or desktop software with buhl:Konto; local self-hosting, an on-prem model, private cloud operation, or API access to SteuerGPT are not officially documented. Buhl states for SteuerGPT that no personal data is used or analyzed and that the applications are operated in German data centers. According to the provider, WISO Steuer itself stores data encrypted on Buhl servers in Germany; according to the FAQ, transmission and storage use HTTPS and AES-256. The buhl:Konto serves as the central login for WISO Steuer and other Buhl products; tax documents can be securely stored there. With tax retrieval, data such as wage tax certificates, pension, insurance, and other data stored with the tax office can be retrieved and automatically transferred into the tax return; this requires user authorization. Regarding deletion, Buhl states in partner FAQs that once the user has ensured data backup, the data can be completely and irrevocably deleted; no verified information is available on detailed retention periods specifically for SteuerGPT. Training on customer data: For SteuerGPT, it is officially documented that no personal data is used or analyzed; a complete public statement on training or non-training using non-personal AI interaction data could not be reliably found.
Conclusion:
Hosting and data protection appear very strong for German private users, but SteuerGPT should not be understood as a freely controllable LLM system, but rather as an integrated AI assistant within the WISO Steuer infrastructure. Sources: SteuerGPT, WISO Steuer FAQ, buhl:Konto, tax retrieval, and data protection/deletion notices.
| On-prem / local hosting | ❓ |
| Private cloud / data center | ⚠️ |
| EU SaaS / Managed | ✅ |
| Hybrid | ⚠️ |
| DPA / AVV | ✅ |
| No training on customer data | ⚠️ |
| Open source / transparency path | ❓ |
Overall assessment:
A Germany-hosted SaaS/app model within WISO Steuer, not standalone LLM hosting. SteuerGPT does not run as a separate AI product, but directly within WISO Steuer. The hosting model is therefore tied to WISO Steuer web/app/desktop: use via browser, app, or desktop software with buhl:Konto; local self-hosting, an on-prem model, private cloud operation, or API access to SteuerGPT are not officially documented. Buhl states for SteuerGPT that no personal data is used or analyzed and that the applications are operated in German data centers. According to the provider, WISO Steuer itself stores data encrypted on Buhl servers in Germany; according to the FAQ, transmission and storage use HTTPS and AES-256. The buhl:Konto serves as the central login for WISO Steuer and other Buhl products; tax documents can be securely stored there. With tax retrieval, data such as wage tax certificates, pension, insurance, and other data stored with the tax office can be retrieved and automatically transferred into the tax return; this requires user authorization. Regarding deletion, Buhl states in partner FAQs that once the user has ensured data backup, the data can be completely and irrevocably deleted; no verified information is available on detailed retention periods specifically for SteuerGPT. Training on customer data: For SteuerGPT, it is officially documented that no personal data is used or analyzed; a complete public statement on training or non-training using non-personal AI interaction data could not be reliably found.
Conclusion:
Hosting and data protection appear very strong for German private users, but SteuerGPT should not be understood as a freely controllable LLM system, but rather as an integrated AI assistant within the WISO Steuer infrastructure. Sources: SteuerGPT, WISO Steuer FAQ, buhl:Konto, tax retrieval, and data protection/deletion notices.
Strengths & Weaknesses at a Glance
| Strengths | Weaknesses |
|---|---|
| - Deeply integrated into WISO Steuer, no separate tool required. | - Not available as a standalone SaaS/API tool. |
| - Tax-specific specialization instead of a general chatbot. | - According to the provider, AI responses may contain inaccuracies or errors and do not replace advice from tax experts. |
| - Guides users to the appropriate sections in the tax return. | - Use is tied to WISO Steuer. |
| - Can be used free of charge within WISO Steuer. | - According to the FAQ, WISO Steuer is not suitable for persons with limited tax liability. |
| - According to the privacy notice, data processing for SteuerGPT takes place via Taxy.io and Microsoft Azure in German data centers. | - There is no publicly documented on-premise or open-source operation for SteuerGPT. |
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GDPR-compliant use possible?
Overall assessment: Well suited, with limitations for third-party data and professional use. SteuerGPT is integrated into WISO Steuer and offered by Buhl Data Service GmbH.
Positive is that Buhl, as the responsible entity, is based in Germany and, according to its own privacy policy, complies with the GDPR. For SteuerGPT, Buhl explicitly states that no personal data is used or analyzed and that the applications are operated in German data centers; according to the provider, the data therefore does not leave the European legal area. In addition, WISO Steuer cites Buhl’s own servers in Germany, encrypted transmission and storage, as well as a zero-sharing policy with no sale or disclosure to third parties.
Negative is: A specific, publicly detailed technical privacy description solely for SteuerGPT, including training logic, a list of subprocessors, and complete retention rules for AI interactions, is not reliably available in the sources reviewed. For cases in which Buhl is used as a processor and third-party data is stored on Buhl servers, for example in tax retrieval or tax submission, Buhl offers, according to tax support, a data processing agreement under Art. 28 GDPR.
Server location: according to Buhl, German data centers or Buhl’s own servers in Germany. Conclusion: For private tax returns, SteuerGPT is strongly positioned from a data protection perspective; for business use, third-party data, or particularly sensitive scenarios, the data processing agreement, purpose limitation, deletion process, and specific processing within the application should be reviewed. Sources: Buhl SteuerGPT, WISO Steuer FAQ, Buhl Privacy Policy, and tax support information on data processing agreements.