Tax
I can't believe this is still going on. If you live anywhere in the EU, or most other countries in the world for that matter, not paying income tax is illegal and will be severely punished if you get caught. Depending of the amount we are talking about you could find yourself in jail.
A swiss bank account has nothing to do with it! Neither does the base mentioned (or not) in your contract.
If you are a resident in a country it is your responsibility to report your worldwide (!) income to your tax authorities.
If you don't, someone is going to find out sooner or later! Authorities are gonna start wondering how come you have a house and two cars but yet no income...
A lot of peole will know what you are doing for a living (family, "friends", colleagues). All it takes is to upset one person that knows and reports you to the tax man.
Do you really want to hide from him for the rest of your life and be afraid to answer the door everytime the bell rings unexpected...
Make no mistake: What you are suggesting is illegal, unless you really live in one of the few countries with no income tax.