Summary
If you make $4,424 a year living in the region of Iowa, USA, you will be taxed $347. That means that your net pay will be $4,077 per year, or $340 per month. Your average tax rate is 7.9% and your marginal tax rate is 8.3%. 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 $8.32, hence, your net pay will only increase by $91.68.
Bonus Example
A $1,000 bonus will generate an extra $917 of net incomes. A $5,000 bonus will generate an extra $4,584 of net incomes.