Yes, exceeding certain bank transaction limits can necessitate filing an Income Tax Return (ITR) in India, even if your income is below the basic exemption limit
a) Depositing more than ₹10 lakh in cash into one or more savings accounts within a financial year is reported to the tax authorities.
b) Depositing over ₹50 lakh in cash into current accounts in a financial year is also reported.
c) Making fixed deposits of ₹10 lakh or more in cash in a year can attract scrutiny.
d) Paying ₹1 lakh or more in cash towards credit card bills in a financial year is monitored.
e) Purchasing or selling property valued above ₹30 lakh must be reported.