This is from experience: Keep financial accounts and records seperate. In other words, EVERYTHING that is yours, put ONLY in your name...checking & savings accounts, assets like cars or other property of value. First, your income is not suppose to be considered when determining child support payments. However, your added income to the household does create a "substantial change in circumstances", giving the ex basis to file for an increase. If you keep records seperate, you will have an easier time proving any improvements in lifestyle are due to your income. The reason to keep assets in your name is if there is ever a question of arrears, whether valid or not, it protects you. Anything with the non-custodial parent's name on it is fair game.