TIN system:

TIN has three key sub-systems:

• Electronic Return Acceptance and Consolidation System (ERACS) which consists of an infrastructure for interface with the taxpayers (a nation wide network of TIN-Facilitation Centres i.e. TIN-FC) and a web-based utility for upload of electronic returns of Tax Deduction at Source (TDS) & Tax Collection at Source (TCS) and Annual Information Return (AIR) to the central system of TIN.
• Online Tax Accounting System (OLTAS) for daily upload to the central system, the details of tax deposited in various tax collecting branches across the country.
• Central PAN Ledger Generation System (CPLGS) which is the central system that consolidates for each PAN:
  1. details of tax deducted/collected on its behalf (TDS/TCS) which is obtained by matching the TDS/TCS returns submitted by the deductors/collectors with the tax deposit (challan) information from the banks;
  2. details of the tax deposited (advance tax/self assessment tax) directly by the taxpayer with the bank;
  Refer to http://www.tin-nsdl.com/ for furthur details.