The FICO scoring system is most commonly used by mortgage lenders. There are many different versions of FICO Scores. Each of the three credit reporting bureaus — Experian, Transunion and Equifax — will use a different version when it comes to mortgages: FICO 2, FICO 4 and FICO 5, respectively. However, the Federal Housing Finance Agency recently announced that all lenders will be required to phase in the VantageScore 4.0 model, in addition to the FICO 10T score, over the next few years. Individual lenders will require a minimum credit score that can range between 580 and 660, depending on the type of mortgage (Conventional, FHA, VA, etc) being applied for.