While filing an income tax return you need not attach any document. However, in order to prepare your income tax return, you need a few documents. The taxpayers need their total income calculation, total TDS or advance tax paid, and proof of deductions. To calculate the total income a salaried individual would need their Form 16. To know the total TDS or advance tax paid, the taxpayer must refer to Form 26AS. The Form 26AS can be downloaded from the Traces website by logging in to their account. To calculate the total eligible deductions, the taxpayers will need proof of payment or fulfilling the conditions.