If you are claiming the person who owes the back child support as a dependent, then your tax return will not be affected.
If you are filing a Married Filing Joint return with the person, then you should also include the Injured Spouse Form 8379 as part of your return. Otherwise, your refund could be seized for the debt of your spouse.
See the following TurboTax article for more information: What is IRS Form 8379: Injured Spouse Allocation?
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