Self assessment tax paid not reflected in ITR2 filled before due date for FY25-26

Dear Sir/s,

I have filed the ITR-2 return for FY 2025-26 on 21-07-2026. Before filing successfully, I paid Self- assessment tax under the 300  category. But it is not reflected in ITR-2  acknowledge copy. Now, the IT department has issued a demand notice for the balance Tax, which I have already paid as Self-assessment tax. I have also checked Form-26, but it is also not showing the paid money of Self-Assessment tax. I have checked the history in e-tax pay; it shows the paid-up money with acknowledgment with date and time.

Now what to do I can't understand. Can I file a revised return and show the paid-up tax details of self-assessment tax? Please suggest.

Jasmin Mehta