Thank you for asking this question - I hope this answer will help you!
Since you are claiming the child this year you will be able to receive the child tax credit when you file your tax return. It should not be affected by any payment your ex-spouse received.
The advanced payments are based on the prior year return, so your ex spouse is receiving the payment as he claimed your child on the most recent tax return. Your ex-spouse will likely be required to repay the amounts received as they will not be able to claim the child for the 2021 tax year.
To opt out of receiving the payments use the IRS Child Tax Credit Update Portal at https://www.irs.gov/credits-deductions/child-tax-credit-update-portal
Only the person receiving the credit needs to take action to opt out. To avoid having to repay the credit your ex spouse will need to do this.
The IRS is continuing to add functions to this site and later this summer it may have the ability for you to update your information and receive the advance payment. Please remember the payments are an advance of the tax credit so you will be eligible to receive the full amount when you file your 2021 taxes.
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