In the United States, a conforming loan is a mortgage loan that conforms to GSE (Fannie Mae and Freddie Mac) guidelines. The most well-known guideline is the size of the loan, which in 2017, for most markets in the continental United States, is limited to $424,100 for single family homes. Some select markets have slightly higher value limits. Other guidelines include borrower's loan-to-value ratio (i.e. the size of down payment), debt-to-income ratio, credit score and history, documentation requirements, and property type.