Level 1
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Deductions & credits

 
Level 20
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Deductions & credits

Is GF the child's Mother?
Level 2
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Deductions & credits

If your girlfriend already filed her tax return and IRS accepted it, she will have to file an amendment, and you would then need to file a return on paper, claiming the dependent. 



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Level 1
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Deductions & credits

Thank you very much!
Level 20
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Deductions & credits

If you and the other parent live together, either one of you (but not both) may claim the child. You may decide between you which one will claim the child. Only if you can’t agree, do the IRS tie breaker rules apply, to see who has first choice. It may be worthwhile to prepare trial returns, both ways,  to see which way the family comes out best. This tool may be useful: https://turbotax.intuit.com/tax-tools/calculators/taxcaster/?s=1.