Extension for 2018 Income Tax Return

[JERRY SWINSON]

I E-filed my 2018 Personal Income Tax Return on 10-09-2019. 

However, I had applied for an extension for that year prior to 4-15-2019 and I assume it was granted since I never got a reply.

 Since i did not attach anything with the return, will the IRS check to see that an extension was filed?

[DoninGA]

If the extension request on Form 4868 was filed and approved then IRS knows you have an extension based on your name and SS number.