I filed an extension by 4/15/18 and paid IRS more than what was due (15k was due, but I paid 20k with my extension) . I got notification that my extension and payment was processed by IRS. However, I couldn't file my taxes by the Oct 2018 deadline. I'm now using TurboTax 2018 CD to mail in my state and federal returns. IRS and state owes me money after I made that extra payment on 4/15. Will they charge me a Late Filing and or Late Payment fine penalty? If so how do they calculate that?
Please any help is much appreciated.
