If you are converting your case from chapter 13 to chapter 7 which is keeping the same case and just changing the chapter, the certificates and classes you already have should be fine. However, if your chapter 13 case is dismissed and you want to file a new chapter 7 case, the credit counseling certificate is good for only 180 days. If it is dated within 180 days of the filing date of the new chapter 7, then yes you can use the same class twice.
Answered on Dec 11th, 2012 at 9:18 AM