An income withholding order is an order from divorce court that orders your spouse's employer to "withhold" a certain portion of his/her income from a paycheck each pay period and send that amount to either you or the court. If it is sent to the court, the court will then send it to you.
Your attorney can request an income withholding order if your ex habitually defies any order handed down by the court to pay periodic payments to you. These are normally spousal support payments or child support payments.
An income withholding order can also collect money for Social Security benefits, a trust fund or other sources of income your ex may have. If you are having problems collecting monies owed you by an ex, the income withholding order will protect you and assure you receive those payments in the future.