First of all, you should consult with a local family law attorney to discuss your options and help you through Court. I presume that you filed a Willful Violation petition and that is the court date that is pending? Make sure that you request payments be made through the support collection unit and/or wage garnishment order.
You can ask for collection through the Child Support Enforcement Unit.
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If you have a Violation Petition pending, you can tell the Judge/Support Magistrate that you want him incarcerated. They may not do that, but having the request out there may get him to cough up some cash and pay in a timely manner.
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Well, they won't "garnish" his tax return (solely), they'll garnish his wages, so long as he has an on-the-books job. Your best bet is to also have the support paid through Support Collection Unit, who can seize any tax refund automatically. In any event, if you're looking for a free follow-up consultation with a Family Law attorney, please feel free to call my Bronx office at 718-725-9600.