Generally speaking, if you have filed jointly with your new husband, then any refund that you receive can be applied to your child support. The basic idea is that by filing jointly as spouses, you are each liable for certain debts of the other spouse.
However, your husband can file Form 8379 in order to prevent his portion of the refund from going to your child support payments. The amount of the refund that you receive based upon your income, credits, paid taxes, etc. will continue to go to child support. The amount of the refund that your husband receives will go to him.
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