Economy Undisclosed income of over Rs 33,000 crore found by IT department in 3 years Updated : December 26, 2018 12:44 PM IST During 2015-16, a total of 4,428 surveys were conducted, leading to the detection of undisclosed income of Rs 9,699.85 crore. This was followed by 12,520 surveys during 2017 fiscal that led to the detection of undisclosed income worth Rs 13,689.76 crore. Subscribe to Moneycontrol PRO at just Rs.33/- per month for the first year. Use code SUPERPRO. Limited period offer. Available on Web and Android.