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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.
Tin (Sn) Tin (Sn), tina 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 bronze, an alloy with copper. Tin is widely used for plating steel cans used as food containers, in metals used for bearings, and in solder. The origins of tin are lost in antiquity.