How are independent software consultants taxed on their income in India?

If I am an independent software consultant with variable incomes and variable+multiple expenses. How do file my incomes and how would I be taxed?
If I am an independent software consultant with variable incomes and variable+multiple expenses. How do file my incomes and how would I be taxed?

I would specifically like to know, what all categories are there under which I can show my expenses.
I want to evaluate 2 options in order to check which one would leave more money in my hands:

1] if working as a full time employee with ~33%TDS

OR

2] working as independent consultant with 10% TDS … and show the expenses individually.

Please guide.