So far, it has received replies from over 7 lakh people who have accepted making such deposits and the department will issue letters to the remaining nudging them to explain the source of deposits on the e-filing portal under Operation Clean Money.
"More than 99 per cent of the 7 lakh respondents have accepted that the data are correct," the official said.
As many as 5 lakh people out of these 18 lakh people who have been sent SMS and e-mail are not registered in the e-filing portal, the official said.
The department has alerted the field offices about the data of people who have not responded as well as over 5 lakh people who are not registered with the e-filing portal and they have been asked to send letters.
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Under Operation Clean Money, the tax department had issued SMS and e-mails to 18 lakh people who have made suspicious deposits of over Rs 5 lakh asking them to explain the source of funds by February 15 on the e-filing portal.
As per the data with the I-T department, deposits of over Rs 2 lakh totalling Rs 10 lakh crore have been made in 1 crore bank accounts. Of this, Rs 4.5 lakh crore have come under verification of the tax department.
The official further said the tax department wants to avoid harassment to taxpayers and hence, has asked the field offices to send "non-statutory" letters to the people who have not filed reply.