Yes you generally have to move it out if you are under retirement age and not taking early retirement. This can be changed by the Trustees of the Fund.

You don't pay tax if you put it in a Swiss based free-standing vested benefits account. Most banks and the post office offer this. Rates can be compared on comparis.ch.

You pay local withholding tax if you are eligible to withdraw it. Eligibility is usually one of:

1. You are not of EU/EEA/CH/ nationality moving outside EU/EEA/CH
2. You are of retirement age
3. You are becoming self employed
4. You wish to pledge/withdraw 25% to buy property (pledging is tax-free but has additional notary costs)
5. You are getting divorced and your spouse has a claim/lien on your pension/(part of it).
6. You are being sued for non-payment of a debt and the court agrees to free-up your pension
7. You have become Swiss and wish to leave Switzerland *for good*

these criteria may be affected by other criteria depending on your personal circumstances (marriage status, children/dependents etc.)