How much federal income tax would an employee with four allowances have withheld?

The amount of federal income tax withheld from an employee's paycheck with four allowances depends on several factors, including their income level, filing status, and the payroll period. Generally, having more allowances reduces the amount of tax withheld, as each allowance increases the employee's tax exemption. To determine the exact withholding amount, one would typically refer to the IRS withholding tables or use the IRS withholding calculator based on their specific situation. It's essential to review these factors regularly, especially if there are changes in income or personal circumstances.