Is my husband owes half of our income tax to child support, can we get the other half?

[Hal_Al]

Yes, but not exactly half. You get the portion attributable to your income. You have to file form 8379, to make that happen.

For details, see: https://ttlc.intuit.com/questions/1910698-how-do-i-file-form-8379-injured-spouse-allocation