The basic gist seems to be: I ended up owing a little more by the time I paid the extension. There was no mention of the penalty while filing. The IRS's letters...

I paid 4/15/17, with an extension which was completed before 10/15. The balance is minimal, just really annoying... I wish TurboTax would be smart enough to kno...

I paid everything turbotax told me to. They're claiming I paid late. I don't see how?