And do not forget the following deductions:
5.05% deduction for the official pension fund (AHV)
2.5-25% depending on age to raise your own pension fund (required by law!)
1% jobless insurance
and health insurance which you have to pay for your own beginning from CHF 180.- per person/month (remember, you and your wife is already two...)
P.S. fo a single person taxes might be around 20% (BSL) and 22% (GVA)
You can also calculate individually here:
Tax calculator| Finance | homegate.ch