
Form 1042-S Withholding on Payments to Foreign Persons: A Compliance Guide for US Businesses
Form 1042-S reports US-source FDAP income paid to foreign persons. US businesses act as withholding agents with personal liability — default 30% withholding, W-8 documentation rules, March 15 deadlines, and stiff per-form penalties. This guide covers W-8BEN versus W-8BEN-E, treaty rate reductions, the source-of-income rules, and common mistakes like sending Form 1099 to a foreign contractor.










