Difficulty: Moderately Easy
Step1
Locate your tax status on your W-4 form.
Step2
Start with your gross pay and subtract your flexible spending amount for child care or health care, if you participate in those programs. The amounts of money you contribute to these programs is taken from your gross pay prior to taxes being calculated; therefore, they are not included as a part of your taxable income.
Step3
Subtract the appropriate amount for each exemption you claim from your gross income.
Step4
Find a Federal income tax chart and calculate your income tax according to the appropriate bracket. As a rule of thumb, your taxes amount to approximately 30 percent of your income with no withholdings of any kind. Remember that whether you claim as single or married will alter this percentage.