Yes, it is completely legal. This is the official Swiss process for recovering overpaid taxes. You are simply exercising your rights. Thousands of people do it every year.
Our calculator estimates your savings in 2 minutes. If it's advantageous, we generate your official pre-filled TOU form (CHF 20). All you need to do is print, sign, and send it.
The estimate is 100% free. If you want to switch to ordinary taxation, we generate your official pre-filled TOU form for CHF 20 — no hidden fees.