Every lender that participates in FHA loans has a compare ratio. A compare ratio is what HUD, who runs the FHA program, uses to keep track of all of their lender’s default percentages, and then compare all percentages to find the average, also known as compare ratio. HUD takes the FHA loans you did in the last 1-2 years and tracks how many of those were seriously delinquent. Seriously delinquent refers to loans that were reported as 90 days or more delinquent by the servicing lender.