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Consider first the reporting of delinquencies by an original creditor.
As the debt remains unpaid, they can update the period of delinquency since the date of initial delinquency, such as an update of a 60-late to a 90-late.
It is standard that the FICO risk of repayment analysis scores increased period of delinquency with a higher negative effect.
When a debt collector reports their collection on a delinquent debt, as the period of delinquency since the date of initial delinquency on the OC account increases, the scoring impact of the collection similarly increases.
Thus, as a debt collector makes either initial or updated reporting of their collection, the scoring impact depends upon the period since DOFD.
When a debt collector makes their initial reporting, the Open Date of their collection (which is the date their received collection authority) determines the deliquency period since DOFD, and thus its calculated scoring impact. If a new debt collector first reports on date X, the delinquency period is the same as if a prior debt collector reported an update to the CRA on date X that the debt remains unpaid, and thus still delinquent.
CRA policy prevents multiple collections reporting on the same debt, as a debt collector is required to delete their reported collection if their collection authority is terminated (either due to termination of assigned collection authority, if they did not own the debt, or by their sale of the debt to another if they did own the debt) and the debt remains unpaid.
Thus, you will not see multiple reported collections concurrently included in your credit report/scoring based on the same debt.