An arrear is basically money that is owed that should have already been paid. Getting behind on your child support payments can have drastic consequences. The amount that you owe will continue grow, due to interest, which can make it seem impossible to pay down. Garnishing of wages, tax refunds, and the suspension of your driver's license can all take place if you get too far behind. These techniques are designed with the intention of keeping your payments up to date and getting your children the money they need when they need it.