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Interest on self assessment tax
Assuming you are Resident Indian. As per Indian Income Tax  As per section 208 every person whose estimated tax liability for the year exceeds Rs.   10,000, shall pay his tax in advance in the form of “advance tax”. Thus, any taxpayer   whose estimated tax liability for the year exceeds Rs. 10,000 has to pay his tax in   advance by the due dates prescribed in this regard. However, as per section 207, a   resident senior citizen (i.e., an individual of the age of 60 years or above) not having any income from business or profession is not liable to pay advance tax.   In other words, if a person satisfies the following conditions, he will not be liable to pay advance tax:   Hence only self assessment tax need to be paid without any interest. Refer the full guideline on Income tax website