Rejection

Where do I find my AGI?

https://ttlc.intuit.com/community/agi/help/how-do-i-find-last-year-s-agi/01/25947

Your 2018 tax return shows your 2018 Adjusted Gross Income (AGI) If you filed a joint return then the AGI is the same for each of you.

Form 1040        line 7

If you are using the same TT account that you used last year, you should also be able to find this number in your Tax Timeline for 2018

If entering the amount from your 2018 tax return does not work, then try entering “0” instead.  If that does not work and you still cannot e-file, then print, sign, and mail your tax return.

You can get a free transcript of your past return from the IRS: 

https://www.irs.gov/individuals/get-transcript

Note: If you filed late or amended your return, your correct 2018 AGI may not be in the system.

https://ttlc.intuit.com/questions/1944348-how-do-i-print-and-mail-my-return-in-turbotax-online

Note:  If you mail your federal return, you will also need to mail your state return.  You will not be able to e-file your state return.

https://ttlc.intuit.com/questions/3415597-what-if-i-entered-the-correct-agi-and-i-m-still-getting-an-e-file-rejec

https://ttlc.intuit.com/questions/1944348-how-do-i-print-and-mail-my-return-in-turbotax-online

If you used the wrong AGI, your e-file  be rejected.  When you get the rejection notice, correct it and re-file.

https://ttlc.intuit.com/community/agi/help/where-do-i-correct-my-agi-in-turbotax-online/00/26311

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@J_E_S_S_E wrote:

SEIC-F1040-506-02 - Each 'QualifyingChildSSN' that has a value on Schedule EIC (Form 1040), must not be equal to another Qualifying Child SSN on another accepted return for the same tax year.

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Do you know if someone may have claimed the child on another tax return?  Your parents, partner or ex-partner, aunt, uncle, grandparent?

If it says your AGI does not match try using zero for the AGI.  If zero does not let you e-file then print, sign and mail it instead.