The federal bankruptcy laws require you to list all creditors when you file your initial bankruptcy petition. For a Chapter 13 bankruptcy, there are three schedules you use to do this: Schedule D (Creditors Holding Secured Claims); Schedule E (Creditors Holding Unsecured Priority Claims); and Schedule F (Creditors Holding Unsecured Non-Priority Claims). By filing these schedules, you notify the court and creditors of your bankruptcy filing; if you fail to list any creditor, that creditor will not receive notice of the bankruptcy or court-imposed automatic stay on collection efforts.
'No Asset' Cases
A Chapter 7 bankruptcy discharges your debts after a bankruptcy trustee seizes and sells your non-exempt assets. A Chapter 7 bankruptcy is a "no asset" case if you don't have property for the trustee to seize; however, even in such cases, the court may discharge all of your eligible debts even if you failed to list some of them in your initial filing. Nevertheless, if you omit a creditor from the schedules, it's best to file an amended schedule of creditors to ensure the automatic stay and eventual discharge is applied to all eligible debts and creditors.
In a Chapter 7 "asset" case, in which you declare non-exempt property to the court for the trustee to subsequently sell, you must file an amended schedule of creditors if you forget or otherwise omit one. If you fail to do this, the court will not extend the automatic stay to those creditors or discharge the debt you've omitted, and may even dismiss the case if it finds you've acted in bad faith. That means all creditors would be free to demand payment or bring you to court.
Chapter 13 Amendments
Not listing a creditor in a Chapter 13 case is a serious matter; not only is the creditor free to pursue you for the entire debt, the debt will remain in force even after the court discharges your other listed debts. If a plan has not yet been drawn up, you can simply file an amended schedule of creditors. If a Chapter 13 plan is already in force, you must file a proposed amendment and allow all creditors time to file an objection — since the addition of debts to the plan may result in a change in the payment amounts. The trustee may require that an entirely new repayment plan is drawn up if new creditors are added.