Tax filing,
the way a fiduciary
would guide you.

1. 01 / 06

   You upload

   PDF, JPG, or PNG from your device

2. 02 / 06

   Swiss storage

   Encrypted at rest, Supabase Zurich region

3. 03 / 06

   Ephemeral sandbox

   An isolated virtual machine reads the file, then is destroyed

4. 04 / 06

   Claude Agent (zero retention)

   Anthropic processes under ZDR — no logging, no training

5. 05 / 06

   Your guide

   Structured entries appear in your session

6. 06 / 06

   Deleted on finish

   All uploads + chat + guide erased when you archive the session

Claude Agent reads your documents, extracts the values, then assembles your guide. Every instruction comes with confidence language. A persistent disclaimer reminds you to verify each entry in your cantonal tax app.

Every session has a dashboard privacy card: retention window, delete now, export bundle (JSON + markdown), download all. Delete is the same visual weight as save. No dark patterns.

• •Salary certificate (Lohnausweis / Attestation de salaire)
• •Bank and broker statements (including stocks, dividends, withholding tax)
• •Pillar 3a attestations (UBS, Finpension, VIAC, Postfinance, etc.)
• •Childcare invoices and crèche certificates
• •Health insurance premium certificates
• •Property tax documents and rental income statements
• •Mortgage interest statements
• •Professional development (Weiterbildung) receipts
• •Donation receipts (Swiss NGOs)
• •Unemployment and loss-of-earnings attestations

We support all 26 Swiss cantons. Tax field names render in the official language of your canton (German, French, or Italian). The UI speaks English for now; additional UI languages are on our list.

• 01Your files are stored in Switzerland and deleted within 24 hours of finishing your return
• 02We never use your data to train AI models
• 03You submit your return yourself in VSTax — we never touch your filing
• 04Claude Agent operates under zero data retention for this app
• 05You can export or delete your entire session at any time
• 06We don't share data with tax authorities or any third party beyond our sub-processors (Supabase, Anthropic, Vercel)

Read the full trust page →

• —We focus on individuals, not companies — self-employed income is supported where it flows through your personal return, but we don't do full business accounting
• —Canton coverage varies — Zürich and Valais have deep support; some others have partial support for specific deductions
• —We don't claim legal or tax advice — every number you enter, you verify, and complex situations should go to a human advisor
• —GR municipal deductions aren't fully mapped yet — check with your commune
• —We don't integrate with your bank or tax authority directly — you bring the documents, you file yourself

• Does CalmTax file my taxes?−

  No. We tell you exactly what to enter in your cantonal tax app (VSTax, ZHprivateTax, etc.) — you file yourself. This is deliberate: your submission stays yours, and we never touch your actual tax return.

• Where is my data stored?+

• Is my data used to train AI?+

• Which cantons do you support?+

• What if the AI gets a number wrong?+

• What documents can you read?+

• How much does it cost?+

• Can I use this for business taxes?+