When a collection agency purchases an unpaid debt, the date opened on the account will reflect the date it purchased the account from the original or previous creditor because that is, in fact, the date a "new" collection account was opened. Both the original account and the new account with the collection company may appear on your credit report.
However, the original delinquency date of the account must remain the same as it was with the original lender. Therefore, even though the open date of the collection account will be more recent, the account history will accurately reflect the age of the debt.
The amount of time the debt will appear in your credit history will not change. Both the original account and the new collection account will be deleted seven years from that original delinquency date.
Debts that remain unpaid with one collection agency also have the potential to be resold and bought by yet another collection company. If this happens, the new company may also report the debt. The previous collection account will be reported as closed, and the new collection account will be reported as opened on the date they purchased the debt and created a new account in their system.
As with the previous collection account, the original delinquency date must be carried over from the original account. As a result, the new collection will also be deleted at the same time.