Validates W-8 series form structural consistency: form-type/Ch.3 status compatibility, Ch.3/Ch.4 FATCA status cross-check, 3-year validity window per Treas. Reg. §1.1441-1(e)(4)(ii), and treaty dividend rate verification against IRS Pub 901. Structural checks only — no TIN, no name, no address. ZERO PII.
🔒 All inputs are processed locally in your browser. No data is transmitted. This tool accepts form-type codes, Ch.3/Ch.4 status codes, treaty country codes, and dates only. NEVER enter real TIN, EIN, SSN, name, address, or beneficial-owner identity data.
Form Identity
Leave blank for W-8BEN (individual). Required for W-8BEN-E.
Treaty Claim
2-letter ISO country. Leave blank if no treaty claim. E.g. GB, CA, DE, JP, AU.
Claimed treaty rate for dividends. Leave blank if no treaty claim.