Taxpayers who missed the December 31 revised Income Tax Return (ITR) filing deadline may still receive refunds if they filed their original or belated ITR on time and it has been verified. However, those who missed all filing windows, including the revised deadline, cannot claim refunds through an Updated Return (ITR-U), which is only for declaring additional income and paying extra tax. Penalties and late fees apply to missed original or belated filing deadlines, not the revised one.