Yes. An extension had to be filed on or *before* April 15, 2019 (unless you were out of the country or in the military). An extension was only an extension to file, not to pay. Any tax due had to be paid on or before April 15, 2019 of late fees and interest started as of that date until the date paid, extension or not.
**Disclaimer: This post is for discussion purposes only and is NOT tax advice. The author takes no responsibility for the accuracy of any information in this post.**
