Publication 15 (Circular E)

Publication 15 (Circular E) is a guide provided by the IRS that explains employers' responsibilities for withholding and depositing federal taxes from employee wages. It outlines how to properly calculate income taxes, Social Security, and Medicare taxes, as well as reporting and depositing these amounts. The publication also includes payroll tax tables, deadlines, and procedures to ensure compliance with federal tax laws. Essentially, it's a comprehensive manual to help employers accurately handle payroll taxes and correctly fulfill their tax obligations.