From €0 per month🇩🇪
AI assistant from DATEV for German professional practices that drafts text, analyzes documents and supports research; the license is free.
Deubner TAX KI AI features, pricing and GDPR (October 2026)
AI research for tax firms based on more than 55,000 tax expert opinions from practice, with source references and a flat price per firm.
Flat feeFree trial
from €99 per month
Pricing details
99 euros per month plus VAT for the whole firm with up to 500 chats, another 250 chats for 49.50 euros; 14-day free trial, one-month term with one month's notice, as of September 2026.
What is Deubner TAX KI?
Deubner TAX KI is an AI research tool for German tax advisory firms. It answers tax law questions with source references, drawing on a curated database of more than 55,000 tax expert opinions from Deubner Recht & Steuern in Cologne.
The database behind TAX KI contains tax expert opinions based on real cases from tax advisory practice, plus administrative directives, laws, decision discussions and articles. Tax specialists curate it and add 500 to 1,000 new opinions every month. Each employee of a firm gets personal access with an archive of past queries. The publisher Deubner Recht & Steuern GmbH & Co. KG is based in Cologne and also offers expert opinions, seminars and a free webinar that shows TAX KI in practice.
Deubner TAX KI AI features and use cases
- Answers tax law questionsStaff type a tax question and receive an answer within seconds with references to the underlying sources. Tax advisers can check the answer against the cited opinion or directive instead of starting research from scratch.
- Searches practice-based expert opinionsThe AI draws on more than 55,000 tax expert opinions from real advisory cases rather than general internet sources. For recurring client questions, the team finds comparable cases faster and can prepare advice with less research time.
- Keeps queries out of model trainingTAX KI uses current OpenAI language models, and the vendor states that queries are not used for AI training or other purposes. Firms can work with client-related questions in a protected environment, subject to their own data protection review.
- Searches internal firm documentsAccording to the vendor, firms can also use internal documents securely in TAX KI and search them with the AI. Their own templates, memos or earlier work then sit alongside the expert opinions. Firms should decide beforehand which client data goes into these documents.
What sets Deubner TAX KI apart
- One flat price per firm of 99 euros a month plus VAT, with individual logins for each employee.
- Built on tax expert opinions from real cases, updated monthly by tax specialists.
- Monthly contract with a one-month notice period and a 14-day free trial.
Where Deubner TAX KI is strongest
Deubner Recht & Steuern is based in Cologne, and its database builds on tax expert opinions about real cases from German tax advisory practice.
Questions to ask before you buy Deubner TAX KI
TAX KI is designed for German tax advisory firms and covers German tax law. It runs on OpenAI models, and the hosting location is not stated on the product page, so ask where queries are processed and request a data processing agreement before entering client data. The monthly price includes 500 chats per firm; larger teams should estimate usage, since each extra 250 chats cost 49.50 euros.
Using Deubner TAX KI in the EU: GDPR and AI Act
- Data locationNot published by the vendor.
- Data processing agreementNot published by the vendor: ask for one (Art. 28 GDPR).
- EU AI ActCheck whether the AI prepares decisions about people. If not, the high-risk rules usually do not apply. The high-risk obligations apply from December 2, 2027 (Digital Omnibus).
General information with sources, not legal advice.
Deubner TAX KI reviews
No reviews yet. Be the first to share how your team uses it.
Every review shows its verification level. We read each one before it goes live. How we check reviews
Questions about Deubner TAX KI
What does Deubner TAX KI cost?
The subscription costs 99 euros per month plus VAT for the whole firm and includes up to 500 chats a month. Additional packages of 250 chats cost 49.50 euros plus VAT.
Can we test it?
Yes. There is a 14-day free trial. After that the contract runs monthly with one month's notice.
Which AI model is used?
According to Deubner, TAX KI uses current OpenAI language models. The vendor states that queries are not used for AI training or other purposes.
Deubner TAX KI update historyno updates yet
No changes recorded for Deubner TAX KI yet.
Changes the vendor made and confirmed user reports, each checked against the vendor's own pages. We review every tool monthly.
Alternatives to Deubner TAX KI
Tools in the same category (Tax automation) with the most overlapping markets.
From €1,059 per year · Free trial🇩🇪
AI assistant in Haufe Steuer Office that answers German tax questions in a dialogue with sources from Haufe commentaries and books and analyzes documents.
From €95 per month · Free trial🇩🇪
Berlin-based software for German GAAP annual accounts, e-filing and tax returns with AI account mapping and AI-drafted notes.
Contact for pricing🇩🇪
AI software from Aachen for German tax firms whose Answers product responds to tax questions using literature from publisher Dr. Otto Schmidt.