For returns required to be filed after 01.04.2018 i.e. your return late fee or penalty would be Rs. 10000 if total income exceeds Rs. 5 lakh and if its below 5 lakh Rs. 1000.
Interest on late payment of tax if any would be different.
However now you can only file return for FY 2018-19 voluntarily and not before that.
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