Summary
If you make $13,541 a year living in the region of Montana, USA, you will be taxed $1,509. That means that your net pay will be $12,032 per year, or $1,003 per month. Your average tax rate is 11.1% and your marginal tax rate is 22.1%. 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 $22.05, hence, your net pay will only increase by $77.95.
Bonus Example
A $1,000 bonus will generate an extra $780 of net incomes. A $5,000 bonus will generate an extra $3,898 of net incomes.