TAN 

Tax Deduction and Collection Account Number better known as TAN is a 10-digit alphanumeric number. The number is required to be obtained by all persons who are responsible for deducting or collecting the tax.

The alphanumeric number is allotted by the Income Tax (IT) Department under Section 203A of the Income Tax Act, 1961. It is required to be mandatorily quoted on all TDS returns.