Dear student,
Profit is the amount of money earned by the owner of a production unit for his entrepreneurial abilities.
This earned profits has to be distributed by the production unit in three ways :
1. income tax to the government: this is known as corporate tax.
2. dividend to shareholders
3. retained earnings of entrepreneur. This is known as undistributed profit.
When calculating National income, the total profit is added. Total profit consists of corporate tax, dividend and retained earnings.
Regards,