How will income be taxed in this case?

A Roy (Staff) (128 Points)

11 March 2013  
Suppose four persons join as partners and work as builders of apartments. They purchase a land and construct flats on that and sells to customers. Now how will their income be taxed? I know for salaried individuals income tax depends on net taxable income after various deductions and on tax slabs. But in case of businesses like this, what is the procedure to calculate income tax for each of them? As an example, if they had spent Rs 1 crore for land purchase and construction and makes a profit of Rs80 lakhs, what will be their individual income tax? Will this attract some additional kind of tax since this is a business? I am just curious to know difference between taxation of a salaried individual and such business by several partners.