This is incorrect MTM provisions are required for HFT and AFS securities, see below from the RBI website-
Secondly I have only taken 50% or 30,000cr of their total holdings so there is enough margin of safety.
Please provide a source for this info, as per their last presentation their investments went up by 10,000cr from 30,000cr to 40,000cr-
Treasury losses were 75cr in Q4FY22

This loss is after accounting for the yield/income from investments. So for example say they had income on investments of Rs 300cr in Q4FY22, MTM losses were Rs 375cr for a net loss of Rs 75cr from the Treasury segment. Now in Q1FY23 if income stays the same but MTM losses double to Rs 750cr then we will have a net loss from the Treasury segment of Rs 450cr.


