Urgent

Hi, the assessee was working as a sales manager in icici prudential life insurance and drawing a salary of rs 6 lac per annum and the assessee has suffered a loss in derivative market of rs 600000 approx. the assessee has not filed his income tax return in that financial year but after receiving a notice u/s 148 , return is filed with interest. Now the case is selected for scrutiny u/s 143(2)and AO want to make a addition of Rs 200000/- u/s 68(unexplained cash credit). My question is that if AO makes the addition of RS 200000/- can i get the benefit of Set off from my business loss of Rs 600000/-. because the business is set off against any other income except income from salary. Thanks