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@sophiejett wrote:

Right- I'm not entering them as a dependent, but should I include the child on my tax return at all? Are there any benefits to doing so? Or do I waive all credits AND deductions when I waive the dependent claim? 


Since you are all living in the same household there is no benefit to you for including the child on your tax return.  It may even cause your partner's return to be rejected if you file your return first with the child entered on your return.