You can deposit any amount of cash if you are holding a valid PAN number. But to be on safe side try to deposit less than 2 lacs in a day. Though doesn't happen if you'll depost more than 2 lacs. Just make sure never deposit more than 50 lacs at once in a current a/c, Specially if it's newly open. Banks usually receive query from IT dept for newly opened account if there is such activity. IT guys will keep an eye on you when you deposit more than 50 lacs in cash in current account.