I was basically assuming you're ahead of the game, since your paperwork must be ...

I was basically assuming you're ahead of the game, since your paperwork must be in at March to be on-time, unless you file for yourself or if your accountant really likes you, I guess... you're right, the deadline is in April, and I assume similarly, charitably, that taxes paid in May as I said are mostly on-time, while that's not strictly true.

YMMV IANAL this is not legal advice, if your tax budget is not already ready to be paid off in March, then I wish good luck to you.