Income tax filling for freelance/proprietorship business

Mrinmoy (Software Engineer) (86 Points)

28 September 2015  

I am Software Engineer & work for a company. I also run a proprietorship business.

Do I need to maintain books of account?
Where can I mention the following income or expenses in ITR 4 (AY 2015-16)? I did not find any option there.
1. Internet bill
2. Apps purchases from third party for integrating to client's websites
3. Hosting and domain purchase expenses
4. Income from online advertisements