If you make CHF 13'000 a year living in the region of Zurich, Switzerland, you will be taxed CHF 840. That means that your net pay will be CHF 12'160 per year, or CHF 1'013 per month. Your average tax rate is 6.5% and your marginal tax rate is 10.8%. This marginal tax rate means that your immediate additional income will be taxed at this rate. For instance, an increase of CHF 100 in your salary will be taxed CHF 10.80, hence, your net pay will only increase by CHF 89.20.
A CHF 1'000 bonus will generate an extra CHF 892 of net incomes. A CHF 5'000 bonus will generate an extra CHF 4'460 of net incomes.
NOTE* Withholding is calculated based on the Zurich tables of Switzerland, income tax. For simplification purposes some variables (such as marital status and others) have been assumed. This document does not represent legal authority and shall be used for approximation purposes only.