If you have income from salary, pension and interest, you would be needing the following to file your income tax return :

1. Copy of PAN Card and Last year Return.

2. Form 16 received from Employer (essential)

3. Details of investments under section 80C including (if applicable) :
a) PF, PPF and NSCs
b) Premium for insurance
c) Tax saving mutual funds
d) Repayment of principal amount of a housing loan
e) Tuition fees of up to two children

4. Details of interest income and TDS of (if applicable) :
a) Savings bank deposits
b) Fixed deposits
c) Bonds, NSCs

5. Medical insurance premium paid for self and dependents under section 80D (if applicable)

6. Pension certificates (if applicable)

7. Receipts of self-assessment tax (if applicable)

8. Details of rent payment (for HRA examination) (if applicable)

9. Statement of housing loan (if applicable)