Delay filing of GSTR3B ITC issues.

This is not valid under GST rules.

ITC for February, March and April cannot be used for the January 2025 return.

Only ITC accrued until January is valid for January return.

In GST, ITC can be claimed for the month to which the return pertains, based on invoices for the period. For a return for January, typically ITC for January would be relevant. 

Using ITC Of Feb, March, April for Jan Return:- Using ITC of February, March, and April for a January return does not align with typical GST return filing rules. ITC is generally claimed in the return for the period it pertains so.