We file as soon as we can for both Federal and State. My husband says that, if you wait until the last minute, it is because you owe...not sure how true that is, but we have never owed.
Of course, for once, it would be nice to KEEP our returns!! We always have something we pay off or pay down...this year is was almost $2000 for both cars to get up to par!!!!
I do wish my husband would get less taken out...but that means we would have less back! I think I can deal with that though