wikipedia:Internal Revenue Service
- W-9 (US citizen or tax resident)
- W-8 (Not a US tax resident. TIN)
- W-7
Related
See also
- IRS, TIN: (ITIN, SSN, EIN) Tax, W-2, W-7, W-8 (W-8 ECI, W-8 BEN), W-9, FATCA, Turbotax, Certified Public Accountant (CPA), Acceptance Agent, FICA, FinCEN, NYDFS, USDT, IRC, W-8BEN-E, W-8BEN