Summary
If you make $12,246 a year living in the region of Montana, USA, you will be taxed $1,295. That means that your net pay will be $10,951 per year, or $913 per month. Your average tax rate is 10.6% and your marginal tax rate is 12.6%. 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 $12.55, hence, your net pay will only increase by $87.45.
Bonus Example
A $1,000 bonus will generate an extra $875 of net incomes. A $5,000 bonus will generate an extra $4,373 of net incomes.