Why don't you just file a civil lawsuit in small claims court ? Its easy and you would be able to get a judgment against him and then garnish his wages
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Here is a link to information on filing a lawsuit in small claims in Washington
Generally, the courts favor the plaintiffs in small claims. You will need to file the lawsuit and then attach as exhibits your divorce decree and a copy of your taxes showing that it was taken and you did not owe it. The IRS does not recognize divorce decrees and they can garnish your wages or state tax returns for these types of debts. However, I am assuming that this "tax debt" was a debt that was accumulated during the marriage, otherwise they would have no rights to your tax return
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