IRS Publication 15 is a document published by the Internal Revenue Service that provides guidance on how to withhold and report federal income tax from employees’ paychecks. It includes information on tax tables, forms, and procedures for employers. The most important thing in IRS Publication 15 is the federal income tax withholding tables, which show employers how much federal income tax to withhold from employees’ paychecks based on their wages and tax filing status. The tables are updated annually to reflect changes in tax laws and are based on the employee’s taxable income, pay frequency, and withholding allowances. At Grant Payroll Inc, we scour the details of sources like Publication 15 so we can help keep your business on the right track.