If you are trying to file a 2019 tax return you are being asked to enter your 2018 AGI. That is found on your 2018 tax return IF you filed a 2018 return. That is how the IRS verifies that the same person is filing 2019 using the same Social Security number. If you did not file a 2018 tax return, then enter "zero" for the AGI. If it still will not let you e-file then you have to print, sign and mail your 2019 return.
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