A nonconforming mortgage is a type of home loan that does not meet the guidelines of government-sponsored enterprises (GSEs) such as Fannie Mae and Freddie Mac. This type of loan may still be available to borrowers, but it will typically be at a higher interest rate than a conforming mortgage. There are several factors that can lead to a loan becoming nonconforming: loan size, down payment size, debt-to-income ratio, credit score and history, and documentation requirements.

Nonconforming loans generally come in two forms: jumbo mortgages and non-QM (non-Qualified Mortgage) loans. Jumbo mortgages are conventional mortgage loans with loan amounts that exceed the conforming loan limit of $510,400, the amount that most lenders consider the maximum amount of purchase price or loan amount to give a low mortgage rate to a home purchaser. Non-QM loans are for borrowers who may not fit the normal requirements for a conforming loan, including self-employed borrowers, people without a regular income, those with nontraditional income sources, and borrowers with significant assets but limited income.

Nonconforming mortgages are typically more expensive than conforming mortgages because the additional risk to the lender makes them more expensive to originate. Interest rates and fees can vary from one lender to another, so borrowers in need of a nonconforming loan should comparison shop for the best terms to fit their financial situation.

In addition, nonconforming mortgages typically require more stringent documentation than traditional mortgages. Lenders may require borrowers to provide additional financial documentation such as proof of savings, investments, or other sources of income to show they have the financial capacity to repay the loan. Borrowers with nonconforming loans must also have a credit score of at least 620 and a debt-to-income ratio no higher than 43%. Even with a more stringent approval process, nonconforming mortgages can be a good option for borrowers with unique situations who may not qualify for traditional financing.

Nonconforming mortgages can be useful for people with unique financial situations. These types of loans may be more expensive than conventional mortgages, but they provide borrowers with an opportunity to purchase a home that they may not be able to finance with a traditional loan. Borrowers should be aware of the extra costs associated with nonconforming mortgages and compare offers from different lenders to get the best deal.