The automatic wage deduction takes the form of a court order to a third party, which is usually an employer, requiring automatic deduction from a paycheck. The support payment (which is a portion of the paycheck) is then mailed directly to the payee. The true beauty of this set-up it that the payor never really sees the money, so he or she is not tempted to spend it.
Some jurisdictions require an automatic wage deduction as a method for paying child support.