Summary
If you make $1,370 a year living in the region of Illinois, USA, you will be taxed $173. That means that your net pay will be $1,197 per year, or $99.78 per month. Your average tax rate is 12.6% and your marginal tax rate is 12.6%. This marginal tax rate means that your immediate additional income will be taxed at this rate. For instance, an increase of $100 in your salary will be taxed $12.60, hence, your net pay will only increase by $87.40.
Bonus Example
A $1,000 bonus will generate an extra $874 of net incomes. A $5,000 bonus will generate an extra $4,370 of net incomes.