Paying Foreign Contractors? A W-8 Documentation & Withholding Checklist

A practical, verifiable process for documenting foreign contractors and vendors and deciding when U.S. withholding applies. Part of the Mac Neal LLC Resource Series.

Inside this guide:

• How to choose between Form W-9, the five Forms W-8 and Form 8233
• A source-of-income decision tree built on one question: where was the work performed?
• The 30% default rate, how treaty claims reduce it, and the Form 8233 process
• A field-by-field W-8 validation review, including tax ID numbers, signatures and expiration
• How payment platforms fit in, plus an onboarding workflow and documentation file
• Common mistakes, when to bring in a professional, and three printable worksheets

18-page PDF with checklists and printable worksheets. Updated October 2026.

General education, not tax or legal advice. Have a question about your own situation? Book a consultation at www.macnealllc.com.