See, I will add my two cents here..
Income tax is also of two types.
Personal Income tax and corporate Income tax.
But the definition is as per entity...
1)
If an individual paying Income tax ( even though the person carrying a business, which has business Income, like share trading etc, filing ITR 3) it is classified as Personal Income.
2)
If an entity registered under various forms , like sole proprietor, partnership, company etc registered to do some business and if that entity files ITR, it is considered as commercial Income tax..
Under which scenario, you will fall under?