Dear Dharambeer,
dont be confused about this i will try to explain the same it might help you. what is profit? profit is a positive amount earned form the difference of Sales - purchase - expenses for sales - taxe and duties. this is your net profit earned, Whereas Income is an money which is beeing received form perfoming an profession or a Job or Jobwork which relates to service provided such as salaries, & tution fees, also income form the property or capital gains is not a profit but the amount recieved form that is treated as income. gain is the difference amount which you receive form sale of property or assets after calcualtion of depreceiation and appreciation of an property or an asset. loss is a negative balance of Sales - purchase - expenses for sales - taxe and duties. where as expenses are money expenditure as well as money expected to be paid for expenditure for eg. profisions made at the end of financial year. & expenditure is an amount actually paid as an expenses.
hope this clearification will help you a lot
if there is any more clerification please forward me the same to my email address