Income tax on msme profits

1. What are the income tax rules on msme profits , is there any special arrangement or all profit will be considered as a income of owner?

2. A 50 lakh loan taken by a msme for plant machinery and working capital, and was repaid to bank in 4 years, what will happen principal amount  witch was repaid will be considered as income of owner? And what happens to those assets plant and machinery  are they considered as income ? After four years.