Re: De-register for AVS? No longer able to work.
First of all, if your tentative payments exceed the definite contributions due, the cantonal compensation office, which is responsible for your AVS encashment, will refund the difference. As you pointed out correctly, the definite payment is calculated from your taxable income.
In any case, itís advisable to report significant changes in expected income. The compensation office will then adjust the bills for your AVS contributions. So, you wonít need to pay contribution payments for income that you are not making.
Nice to know for very small scale businesses, but not sure if it applies to you: If you are employed and run a self-employed business on the side, you donít have to pay for social security, as long as you donít make more income than CHF 2í300 p.a.
Hope that helps.