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  1. Taxpayer identification numbers (TIN) | Internal Revenue Service

    A Taxpayer Identification Number (TIN) is an identification number used by the Internal Revenue Service (IRS) in the administration of tax laws. It is issued either by the Social Security …

  2. Tin - Wikipedia

    It has two main allotropes: at room temperature, the stable allotrope is β-tin, a silvery-white, malleable metal; at low temperatures it is less dense grey α-tin, which has the diamond cubic …

  3. How to Find Your Taxpayer Identification Number (TIN)

    Aug 10, 2025 · A Taxpayer Identification Number (TIN) is a nine-digit number used by the Internal Revenue Service (IRS). It identifies individuals and businesses for tax purposes and is …

  4. Taxpayer identification number (TIN): What it is and how to find it

    Jun 6, 2025 · A taxpayer identification number (TIN) is a nine-digit number used to identify taxpayers. If you need to file taxes, you need a TIN.

  5. Lookup EIN Numbers for Any U.S. Business by Name or Address

    The TIN is an identification number used for the administration of tax laws in the US. Examples of TINs include: Individual Taxpayer Identification Number "ITIN" Employer Identification Number …

  6. Where can I find my tax identification number? - Jackson Hewitt

    6 days ago · You can find your TIN (Tax Identification Number) on your tax returns from previous years and Social Security card, as well as Form W-2 and/or 1099. For most individuals, your …

  7. United States Tax ID Number (TIN) Guide - TaxDo

    TaxDo offers a compliant, automated, and globally trusted solution for TIN verification—not just in United States, but across 135+ jurisdictions. Unlike other solutions, TaxDo validates tax IDs …

  8. Tax identification number (TIN) definition and meaning - OnPay

    Nov 27, 2025 · Learn what a tax identification number (TIN) is and why employers need them, plus expand your HR and payroll knowledge in our small business glossary.

  9. Tin | Definition, Properties, Uses, & Facts | Britannica

    Nov 11, 2025 · Tin, a chemical element belonging to the carbon family, Group 14 (IVa) of the periodic table. It is a soft, silvery white metal with a bluish tinge, known to the ancients in …

  10. What is a TIN Number - Guide 2026 | US Expat Tax Service

    Jan 7, 2025 · A Tax Identification Number (TIN) is a nine-digit number assigned to individuals, businesses, and other entities for identification in tax-related matters. Think of it as your …