Summary
If you make $4,983 a year living in the region of Iowa, USA, you will be taxed $394. That means that your net pay will be $4,589 per year, or $382 per month. Your average tax rate is 7.9% and your marginal tax rate is 8.7%. 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 $8.71, hence, your net pay will only increase by $91.29.
Bonus Example
A $1,000 bonus will generate an extra $913 of net incomes. A $5,000 bonus will generate an extra $4,565 of net incomes.