The IRS released the 2021 Employer’s Supplemental Tax Guide (Publication 15-A). The 2021 Circular E, Employer’s Tax Guide (Publication 15), and the Employer’s Tax Guide to Fringe Benefits (Publication 15-B).

Breakdown of Publications 15

• Publication 15 (Circular E) contains the bulk of the information employers need for tax information. For 2021, Circular E summarizes much of the COVID-19-related tax credits and other tax relief on page 2.
• Publication 15-A contains specialized and detailed employment tax information supplementing the basic information provided in Circular E.
• Publication 15-B contains information about the employment tax treatment of various types of noncash compensation.
• Publication 15-T, Federal Income Tax Withholding Methods, contains the percentage method and wage bracket method withholding tables, as well as the amount to add to a nonresident alien employee’s wages for figuring income tax withholding.