We can still put our own cutoff date for starting new returns whether it's 04/15 or 05/15. I won't accept (yeah, right) new tax returns after the last Sunday in March (doesn't end up that way) but I do accept remaining missing data.  It's just with investment houses getting info so late, K-1's coming last minute I'm finalizing 60% of my returns in the last three weeks.  It's too much.