A Permanent Account Number or PAN card is an important document in India. You’ll need it to file income tax returns, to make payments above Rs. 50,000, and even to open a bank account. TAN is allotted by the Income Tax Department .When filing for Tax Deducted at Source (TDS) or Tax Collected at Source (TCS), quoting TAN is a pre-requisite. As a 10-digit alpha-numeric identifier for individuals or entities that deduct or collect tax at source, TAN helps in streamlining the deduction and collection of tax at source.