Review your decree and property settlement agreement. Make sure that you are entitled to the exemption each year. Sometimes it alternates. You may want to contact your divorce attorney about filing a motion in your case for a violation of the decree by your wife.
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There are various options you could do. You could have her held liable for the tax benefit you would have or what she received. Also contempt or other modifications.
This is not a comprehensive answer and it is impossible to provide a meaningful response without a consultation. Call us for more information. 619.797.5456 www.mataelelaw.com