The fact that they canceled the debt is reportable on the credit report. For how long that can be reported I am not sure about. It should be 7 years from the date of last activity on the account, or when it became fully due. I do not know if the cancellation of the debt via 1099-C qualifies as a valid activity to reset the clock. But even if it is, the very worst is that this will be on your credit report for 7 years from then. Otherwise it is 7 years from the latter of when the debt is charged off or when you last paid on it.