Hello DS645,
You claimed your great niece that you had legal custody of on your 2020 Income tax return. However, your grand niece moved back in with her father on May 12, 2021. You want to know how to not claim your grand niece on your 2021 return and I assume not receive the Advance Child Tax Credit for her moving forward.
You can unenroll from the 2021 Advance Child Tax Credit payments using the IRS Advance Child Tax Credit Portal. Please find the link to the portal below.
Link: https://www.irs.gov/credits-deductions/advance-child-tax-credit-payments-in-2021
You will need to click "Manage Payments," sign up for your account, and then choose to unenroll from the advance child tax credit payments.
Also, if you do not want to claim your grand niece on your 2021 return, you will just exclude her from your return when you prepare the return in early 2022. You do not need to make any changes to your 2020 return that has been filed.
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