Publication 15-A contains specialized and detailed employment tax information supplementing the basic information provided in Publication 15.
Current revision
Recent developments
Additional Guidance for Substitute Submissions of Form W-4 -- 29-NOV-2022
Other items you may find useful
All Publication 15-A revisions
Electronic Federal Tax Payment System
About Form 940, Employer's Annual Federal Unemployment (FUTA) Tax Return
About Form 944, Employer's ANNUAL Federal Tax Return
About Form 945, Annual Return of Withheld Federal Income Tax