Documents to support your IT Returns !!

Hi,

I wanted to know that what are the Documents that one need to maintain to support your IT Returns, just in case in future if there is any Scrutiny or a raid from the Department. Documentation for someone filing a ITR4 (Income From Business)

The Documents I am aware are:

- IT Returns Acknowldgement Slip

-IT Returns form (eg: ITR4)

-Computation Sheet

-Investment Certificate, if claiming an exemption under 80C (eg: PPF,Mutual Fund)

Please let me know what are the other documents one needs to maintain.

Thanks & Regards,

Harshit Patel