Summary
If you make $21,255 a year living in the region of Colorado, USA, you will be taxed $3,251. That means that your net pay will be $18,004 per year, or $1,500 per month. Your average tax rate is 15.3% and your marginal tax rate is 22.9%. 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 $22.92, hence, your net pay will only increase by $77.08.
Bonus Example
A $1,000 bonus will generate an extra $771 of net incomes. A $5,000 bonus will generate an extra $3,854 of net incomes.