the subsidized stafford does not start accruing interest while you are in deferment....that includes economic hardship deferment (EHD). What sucks is that you can only apply for EHD for 3 years. So if you are in a 4 or 5 year residency program, after your 3 years of EHD are up you have to go into forebearance, and its when you do this, that they can start applying interest to your subsidized stafford. Hope that helps.