
The 24% Backup Withholding Trap: A Small Business Guide to W-9s, CP2100 Notices, and Form 945
Backup withholding forces payers to deduct 24% from contractor payments after a missing W-9, refused TIN, or CP2100 notice — here is the 15-day and 30-day cure clock, Form 945 deposit rules, and the onboarding setup that keeps small businesses out of the trap.










