Date Reported, Date Opened, Date of Last Activity?

What Date is most important for your Credit Score? What date is most important. it depends on the type of account. I Explain what the difference is from a FICO scoring perspective. What role each score plays in and its effect on the FICO scoring model. I do not address what date effects when an account can be removed based on the 7 year rule for most credit accounts that date is 7 and 1/2 years from the date of first delinquency.