What is 90 days same as cash?

Many retailers offer some amount of time, same as cash to get people in the door.  It offers people the ability to get something now and not have to worry about paying for it or interest on it until a later time.  90 days same as cash means that you can purchase something such as a tv on approved store credit today.  You begin getting statements for this typically the same as any other credit card.  If you pay it off within the 90 days you will have not paid any interest on the charge, thereby being "same as cash."  

Before entering into this type of agreement you really need to read the fine print.  In many cases if you do not pay off the debt within the time frame specified you may get dinged with accrued interest for the entire time period.  So if you did not pay off the debt in 90 days you may get billed for 90 days of interest!