Definitions for "Preferential Transfer"
a payment made to or for the benefit of the subcontractor or supplier, a creditor of the debtor, on account of work previously performed
Payments to creditors within 90 days of filing for bankruptcy can be voided by the judge and recovered and placed in you estate for distribution to other creditors. If the payment is made to a relative or friend within the last year before filing it can also be recovered. In other words, paying off your lowest credit card so you can continue using it after filing will not work.
Defined in Code Section 547(b). A transfer of property for a creditor's benefit made wtihin 90 days before the filing date or within one year if transfer is made to an insider, and it causes the creditor to receive more than he would have in a liquidation case. This kind of transfer is voidable by the Trustee.