TIN Compliance · Plain-English guides, calculators and templates for IRS TIN matching, B-Notices, backup withholding and information-return penalties. Published by
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© 2026 TIN Comply. TIN Comply is a product of Informed Identity LLC. This site is general information about U.S. information-reporting rules, not legal or tax advice; confirm current requirements in IRS publications or with your adviser. IRS, CP2100, 972CG and W-9 are designations of the U.S. Internal Revenue Service; this site is not affiliated with or endorsed by the IRS. Last reviewed November 5, 2026.
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