If you have a family law attorney representing you in your matter, I suggest that you speak to him or her first before you file any petition to have the court review its decision on the issue of payment for taxes. The order needs to be carefully reviewed. From what you have written, it seems to me that if the total amount of your taxes is $15,000, you would owe $7,500 and he the same amount.If that amount is not to your satisfaction, you need to consult with your family law attorney assuming you have one to see what can be done to change the judge's decision through a subsequently filed pleading.