• Share
Send to a Friend via Email

### Your suggestion is on its way!

An email with a link to:

was emailed to:

Thanks for sharing About.com with others!

Discuss in my forum

# Calculate Federal Income Tax

The average American wants to share as little of his or her earnings with Uncle Sam. How does the saying go? Don’t tax you. Don’t tax me. Tax that man behind the tree. Gnawing on a worker’s wages, income tax is an everyday example of percent decrease at work.  This article focuses on using percents to calculate disposable income, the amount of money that remains after paying federal income tax.

### How to Calculate Income Tax

When you get that first real job and learn that you’ll have an annual salary of \$36,000, realize that you don’t have \$3,000 a month to spend.

Let’s say that your income tax rate will be 5%. What will be your disposable income?

1. Find the amount of taxes that you’ll pay.
36,000 * .05 = \$1,800

2. Subtract the amount of taxes from your income.
\$36,000 – \$1,800 = \$34,200

Disposable Income:  \$34,200
Disposable Income per Month: \$34,200/12 = \$2,850

Don’t run out and get a mortgage and car note that total \$2,500 a month. Otherwise, you will be the hungriest person living the American Dream.

### Exercises

Use each annual salary and tax rate to calculate disposable income.

1. Annual salary: \$350,000
Federal income tax rate:  28%
Disposable income:

2. Annual salary:  \$10,000
Federal income tax rate: 5%
Disposable income:

3. Annual salary:  \$80,500
Federal income tax rate:  10%
Disposable income:

4. Annual salary: \$175,000
Federal income tax rate: 23%
Disposable income:

5. Annual salary: \$50,400
Federal income tax rate:  10%
Disposable income:

6. Annual salary: \$93,550
Federal income tax rate:  18%
Disposable income:

7. Annual salary:  \$27,950
Federal income tax rate:  5%
Disposable income:

Explore Mathematics