Get your taxes done using TurboTax

@lythompson - did you complete form 2210 correctly?  if your income is 'lumpy' which sounds like it might be, then in Part 2 of this form, checkbox "C" should have been checked and then Form 2210AI should have been completed.  That usually results in lower / no penalty. 

 

I imagine you can still amend if this didn't occur.