TaxWize vs. ChatGPT for Your Swiss Tax Return
TaxWize compared with ChatGPT for preparing a Swiss tax return: where your documents are processed, how the number is calculated, and where ChatGPT is honestly the better tool.
Many people now type a tax question into ChatGPT before they ever open a tax form, and for a quick explanation of a term or a deduction that is often a perfectly good place to start. This page asks a narrower question: what changes once you stop asking ChatGPT things and actually upload your salary statement, bank statements and receipts to prepare a Swiss tax return from them?
Two differences do most of the work.
Your documents stay in Switzerland
With TaxWize, every document you upload is processed in Switzerland, on infrastructure operated by Infomaniak, under Swiss data protection law (the nDSG). Your files are never used to train any AI model. That is not a premium option for larger customers; it is simply how TaxWize works, for everyone.
With ChatGPT, your data leaves the country by default. Under OpenAI's own privacy policy for Switzerland and the EU, personal data is processed on servers outside Switzerland, including in the United States, on the Free and Plus plans almost everyone uses. Your tax return is one of the most sensitive documents you own, and where it is processed is not a detail.
A rule set calculates your tax, not a chatbot
With TaxWize, exactly one step uses AI: reading your documents. A language model proposes the values from your salary statement and receipts, and you see, correct and confirm each one. From there, the tax is calculated by a fixed, deterministic rule set that applies your canton's published tax rules to those checked values. Give it the same inputs and it returns the same number, every time.
ChatGPT produces its answer the other way around: it writes text, and shows its own notice on every reply, "ChatGPT can make mistakes. Check important info." It is a general-purpose assistant, and OpenAI's own terms say you should not rely on its output as a substitute for professional advice. For a number you are going to file, a rule you can follow is a firmer footing than an answer you have to check.
The two tools side by side
| Criterion | ChatGPT (Free/Plus) | TaxWize |
|---|---|---|
| What it is | A general-purpose AI assistant for almost any topic | A tool built for one job: your Swiss tax return |
| Where your input is processed | Outside Switzerland by default, including on the paid consumer plans | Always in Switzerland, at Infomaniak, under the nDSG |
| How the number is produced | Written by the language model from your conversation | A deterministic rule set applies your canton's published rules to checked values |
| Output | Free-form text you structure and verify yourself | A structured, filing-ready report for your canton |
| Good for | Quick explanations and thinking a question through | The one tax return you actually need to file |
Honestly: where ChatGPT is the better tool
None of this is a case for dropping ChatGPT. For understanding a term, getting your bearings, or thinking a question through, it is instant, often free, and frequently all you need, which is exactly what it is built for.
A few honest details, so the comparison stays fair: on OpenAI's business and education plans (Business, Enterprise, Edu) your content is not used for training by default, and Enterprise and Edu can additionally be set up with European or Swiss data storage, though the Business plan cannot. For most people preparing their own return on Free or Plus, none of that applies. Every statement about ChatGPT here reflects OpenAI's own published policies as of 07.07.2026, which OpenAI can change at any time.
In the end it comes down to the job. ChatGPT is built to answer almost anything. TaxWize is built for the one tax return you actually have to file, with your documents kept in Switzerland from start to finish.
AI transparency
How TaxWize itself uses AI
To read your uploaded documents, TaxWize uses an open-weight language model hosted in Switzerland by Infomaniak; text recognition (OCR) also runs self-hosted on Swiss infrastructure. The tax calculation is a deterministic rule set based on published cantonal tax rules; document reading uses AI and is checked by you. Your documents are processed in Switzerland under the nDSG and are not used to train models.
Frequently asked questions
Can't I just do my tax return with ChatGPT?
ChatGPT is a good way to understand a term or get your bearings. For an actual tax return, ChatGPT is missing three things: a Swiss cantonal rule set, structured document handling, and, by default, processing of your documents in Switzerland. TaxWize covers exactly those three.
Does TaxWize train its own AI models on my tax documents?
No. TaxWize processes your documents on Swiss infrastructure operated by Infomaniak, under the nDSG, and does not use your content to train models. That applies to every user, regardless of plan, not just larger customers.
Does ChatGPT make mistakes on tax questions?
We can't say that categorically, and we don't claim it. What is publicly documented: ChatGPT shows its own notice in every chat that it can make mistakes and that important information should be checked. At TaxWize, that same caution is handled by a fixed rule set rather than a generated answer.
Does this still apply if I use ChatGPT Business or Enterprise?
Partly. For ChatGPT Business (formerly Team), Enterprise and Edu, OpenAI does not train on your content by default. European or Swiss data residency can additionally be set up for Enterprise and Edu, but not for Business. A Swiss cantonal tax system still isn't part of the product at any of those tiers. And for most individuals preparing their own tax return, Free or Plus is the relevant tier anyway.
Ready for a result you can trust?
TaxWize processes your documents in Switzerland under the nDSG and applies published cantonal tax rules, so you file with confidence. CHF 39 per tax return per tax year.
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