Form 26AS is most important document for tax payers as it is a tax payment and deduction ledger for them. It shows Tax deducted /collected amount by deductors, Amount paid with TDS against form 15G/15H, tax paid by tax payer like advance tax, self assessment tax etc. Further it also shows refund amount . Every tax payer should match tax amount shown in form 26AS with tax claimed in Income Tax return before filing of income tax return. Now income Tax department have given automatic population of TDS entries in Income tax return from pan ledger/Form 26AS.