@glgro Not sure what you mean by "safe" to file your 2019 return. There is nothing unsafe about going ahead and filing your 2019 return. Since you filed 2018 late, you will not have a 2018 AGI to help you e-file 2019, because it will not be in the system this year--ever. So you can try using "zero" as your 2018 AGI. If zero does not work then you have to print, sign and mail your 2019 return.
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