Collections stay on your credit report 7 years after the date of last activity. Don't let this confuse you...normally 7 years after date of last activity means the date that it was sold to the collection agency.Usually your account must be 180 days past due in order for the company to do that.ollections stay on your credit report 7 years after the date of last activity. Don't let this confuse you...normally 7 years after date of last activity means the date that it was sold to the collection agency.