Can you cite the IT rules or an article that backs up what you say, please?
I have no idea whether you are right or wrong, but your statement goes against my understanding of advance tax. I would like know the correct position regarding this.
Thank you.
EDIT: I found an article in Mint that clearly is contrary to what you mention
Tax on long-term capital gain (LTCG) can also be paid before filing of ITR by way of self-assessment tax along with interest by 31 July.
www.livemint.com
"
Tax on LTCG can be either paid by way of advance tax in four instalments (15% by 15 June, 45% by 15 September, 75% by 15 December and 100% by 15 March) or before filing of ITR by way of self-assessment tax along with interest by 31 July."