Interestingly, the operations (surveys) were launched from the evening as the taxman wanted some hard cash to get accumulated at the payment counters to make the action effective.
Officials said the operations are being carried out at least at four locations in the national capital including popular market places like Karol Bagh, Dariba Kalan and Chandni Chowk, three locations in Mumbai and few others in Chandigarh and Ludhiana.
Sources said the department had received "actionable inputs" that some traders, jewellers, currency exchanges and hawala dealers were allegedly exploiting the recent currency demonetisation of Rs 500 and Rs 1,000 notes and were changing currencies at "discounted" prices, thereby profiteering illegally.
They said the operations were planned after CBDT Chairman Sushil Chandra yesterday asked all the investigation units in the country to keep a check on suspicious movement of huge cash and other illegal transactions leading to tax evasion.
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At few places, they said, some preliminary documents have been seized.
Finance Minister Arun Jaitley today assured people that taxman will not hound those making small deposits in scrapped Rs 500/1,000 currency adding, however, people with "large amounts of undisclosed monies will have to face the consequences under the tax laws".
Top I-T department officials had yesterday said the government's directive to them is "very clear", saying any instance of tax evasion and black money should be dealt with strictly, especially after two opportunities in the form of one-time stash declaration window has been provided.