With Rs 58,000 crore prize money won in the last three years, the income tax department has started issuing notices to individuals who have played and won online games, CBDT Chief Nitin Gupta said on Tuesday. The department has started alerting the winners on the tax compliance dashboard wherever there is a mismatch in income and tax payments. "We have mounted an action in this (online gaming) sector and determined that Rs 58,000 crore winnings were there in last 3 years. The data is with us. We are in the process of issuing notices," Gupta said.