Multiply the gross paycheck by the withholding percent and divide by 100. Subtract that from the gross. A $2,000 check at 22% withholds $440 and leaves $1,560.
Federal income tax, state tax, Social Security, and a retirement contribution can be one combined percent or several. Add the percents only when they apply to the same gross. A flat dollar deduction, such as a health premium, is not a percent and is not in this result.