Summary
If you make $12,979 a year living in the region of Colorado, USA, you will be taxed $1,407. That means that your net pay will be $11,572 per year, or $964 per month. Your average tax rate is 10.8% and your marginal tax rate is 20.2%. 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 $20.18, hence, your net pay will only increase by $79.82.
Bonus Example
A $1,000 bonus will generate an extra $798 of net incomes. A $5,000 bonus will generate an extra $3,991 of net incomes.