Summary
If you make $66,809 a year living in the region of South Dakota, USA, you will be taxed $12,577. That means that your net pay will be $54,232 per year, or $4,519 per month. Your average tax rate is 18.8% and your marginal tax rate is 29.7%. 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 $29.65, hence, your net pay will only increase by $70.35.
Bonus Example
A $1,000 bonus will generate an extra $704 of net incomes. A $5,000 bonus will generate an extra $3,518 of net incomes.