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Taxpayer Identification Number (TIN): Overview What is a TIN? A Taxpayer Identification Number (TIN) is required by the federal government for reporting purposes. A TIN can be a Social Security Number (SSN) or an Individual Taxpayer Identification Number (ITIN). A valid TIN can have only 9 numbers.
Synonyms and Antonyms for sn. 1. Sn (n.) a silvery malleable metallic element that resists corrosion; used in many alloys and to coat other metals to prevent corrosion; obtained chiefly from cassiterite where it occurs as tin oxide.