My girlfriend completed Earned Income Credit on her taxes but didn’t claim the kids, i claimed the kids and it says “cant use the kids SSN more than once

[SweetieJean]

Do you all live together?

[bookie53-tj]

Yes with our two children

[Hal_Al · Accepted solution]

If you and the other parent live together, only one of you can claim the child for any tax benefit. The interview is confusing (it's designed for divorced parents). The second parent should not enter the child, at all. 

You may decide between you who will claim the child, but only one of you can do so.

You can NOT do what you are trying to do; mother claim EIC and father claim dependent. You may have heard of a special rule in the case of divorced & separated (including never married) parents that allows them to do that. This "splitting of the child" is not available to parents who lived together at any time during the last 6 months of the year; then only one of you can claim the child for any tax reasons. 

[bookie53-tj]

We are going to amend her taxes, so then she will claim one child and I’ll claim the other. This way we believe it will Work were we both can do EIC and both claim one of our two children

[Hal_Al]

Yes, that is allowed.