You wrote: "I've read here. If last years return was accepted after Tax Day, April 15th 2019. The AGI then becomes zero."
No, that April date is not the determining factor. It has nothing to do with that April date. I don't know where you read that, but it's wrong. When efiling a current 2019 return, one would use a 2018 AGI of 0 only if the 2018 return was filed very late, such as mid-November 2018 or later.
And from your comment above, you said you filed your return well before November 2018. In fact, you even said you received your refund "early in the Summer." So in that case you would use the actual 2018 AGI shown on your 2018 return--even if you filed after April, such as in May, June, July, etc. Only if you filed in November or later would one use an AGI of 0.
By the way, if you have reason to post more in this forum, please use a normal font size without italics. The overly large size/style of font you are using can be annoying and difficult to read.
