Hi there,
I understand that your friend is in receipt of a notice from one of the authorities specified under section 133(6) of the Income-tax Act, 1961 ("the Act") requiring him/her to furnish information on the points mentioned therein and/or to furnish the financial statements for the period mentioned therein within the time period mentioned in the notice.
As per Section 133(6) of the Act the specified authorities have the power to call such information and/or documents from any person by issuing.
Where a notice as above is received, the person should respond to the officer by way of an appropriate submission providing requisite details. Hence in the present case your friend is advisable to make a timely submission to the tax officer.
Kindly note that non-compliance of the notice issued under section 133 could result in levy of a penalty of INR 100 for every day during which the failure continues.
Hope the above suffice.
Regards