Summary
If you make $99,970 a year living in the region of Montana, USA, you will be taxed $27,985. That means that your net pay will be $71,985 per year, or $5,999 per month. Your average tax rate is 28.0% and your marginal tax rate is 36.8%. 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 $36.76, hence, your net pay will only increase by $63.24.
Bonus Example
A $1,000 bonus will generate an extra $632 of net incomes. A $5,000 bonus will generate an extra $3,162 of net incomes.