Optiqo
Methodology · Optiqo

How Optiqo works

Every number on Optiqo comes from a public source we cite, run through a transparent computation we document. This page is for verifying our work before trusting an output.

Read about

→ /docs/engine

How we compute your tax

How federal, cantonal, and commune scales combine into the final number — including the special cases for Geneva, Basel-Landschaft, Valais, Neuchâtel and the splitting cantons.

→ /docs/data

Where the data comes from

Per-canton source lineage: which official PDF, CSV or HTML page we read, when, and how we transformed it. Every commune Steuerfuss carries an attribution you can click through.

→ /docs/embed

Embed the atlas on your site

How to drop the Optiqo atlas or a single-commune dossier into any partner site as an iframe. Free, with attribution.

At a glance

  • ~2 060 communes across 26 cantons, refreshed yearly via authoritative cantonal sources.
  • 26 of 26 cantonal tax scales transcribed from ESTV Kantonsblätter 2026.
  • Federal scale from the ESTV Kreisschreiben for direct federal tax (DBG / LIFD).
  • Multi-language in EN / DE / FR / IT.
  • Live at optiqo.ch.

Open methodology

Every numerical assumption Optiqo uses is documented. Every commune's Steuerfuss carries a source attribution (e.g. “fin.be.ch Steueranlage 2026 (PDF)”). Every cantonal scale lists its ESTV Kantonsblatt source. The federal scale comes from the ESTV Kreisschreiben.

If you find an error or have a question, email hello@optiqo.ch with the page URL and the discrepancy. We respond within 48 hours.