Summary
If you make $51,990 a year living in the region of South Dakota, USA, you will be taxed $8,467. That means that your net pay will be $43,523 per year, or $3,627 per month. Your average tax rate is 16.3% 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 $20.20, hence, your net pay will only increase by $79.80.
Bonus Example
A $1,000 bonus will generate an extra $798 of net incomes. A $5,000 bonus will generate an extra $3,990 of net incomes.