"We would be getting reports of all cash deposited during the period of November 10 to December 30, 2016, above a threshold of Rs 2.5 lakh in every account.
"The (tax) department would do matching of this with income returns filed by the depositors. And suitable action may follow," Revenue Secretary Hashmukh Adhia said tonight.
Any mismatch with income declared by the account holder will be treated as a case of tax evasion.
The government has allowed citizens to deposit in their bank accounts old currency of Rs 500 and Rs 1,000 denominations, which had been declared invalid in the nation's biggest crackdown on blackmoney, corruption and counterfeit notes, between November 10 and December 30.