Summary
If you make $4,680 a year living in the region of Colorado, USA, you will be taxed $389. That means that your net pay will be $4,291 per year, or $358 per month. Your average tax rate is 8.3% and your marginal tax rate is 12.3%. 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 $12.25, hence, your net pay will only increase by $87.75.
Bonus Example
A $1,000 bonus will generate an extra $878 of net incomes. A $5,000 bonus will generate an extra $4,388 of net incomes.