Summary
If you make $18,000 a year living in the region of Wisconsin, USA, you will be taxed $2,283. That means that your net pay will be $15,717 per year, or $1,310 per month. Your average tax rate is 12.7% and your marginal tax rate is 21.6%. 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 $21.62, hence, your net pay will only increase by $78.38.
Bonus Example
A $1,000 bonus will generate an extra $784 of net incomes. A $5,000 bonus will generate an extra $3,919 of net incomes.