Tax related query

As per my understanding:

General definition of " Expenses" is "The economic costs that a business incurs through its operations to earn revenue." Income tax is not an expense that business have incurred to earn its revenue. Income tax is on entity's earning as a whole not on particular business. So income tax paid is not related with business thats why it is sometimes called Personal Income Tax. And therefor it is not treated as expense for business but shown under below the line.

I believe Mr. Mayank is correct. Further, I would like to add that income tax is payable only when there is a net profit. In my opinion, due to the above 2 reasons, income tax is treated as a below-the-line item.

Thanks for your answer.......................