What Is a Nonconforming Loan?

A nonconforming loan is a type of mortgage that does not meet the guidelines set by government-sponsored enterprises (GSEs) such as Fannie Mae and Freddie Mac. These entities buy and securitize loans that meet specific standards, referred to as conforming loans. When a mortgage falls outside those standards—due to loan size, credit profile, property type, or documentation—it is labeled as nonconforming.

Nonconforming loans are often associated with higher risks for lenders, and as a result, they may carry higher interest rates, stricter terms, or require more extensive documentation and larger down payments. However, they also provide financing options for borrowers who do not qualify under traditional underwriting guidelines, whether due to unique financial circumstances or the nature of the property being financed.

GSE Guidelines and the Basis for Conformity

Fannie Mae and Freddie Mac have established underwriting criteria that define what constitutes a conforming loan. These include limits on loan size, debt-to-income ratios, credit scores, and other factors that influence the creditworthiness and risk profile of the borrower.

The most recognizable benchmark is the conforming loan limit, which is adjusted annually by the Federal Housing Finance Agency (FHFA). For 2024, the baseline limit for a single-family home in most areas is $806,500, though this figure may be higher in high-cost regions. Loans that exceed these limits are referred to as jumbo loans, which are a common type of nonconforming loan.

In addition to loan size, nonconforming status may result from factors such as:

• A borrower’s credit score falling below the minimum acceptable level.
• A loan-to-value (LTV) ratio that exceeds conforming limits.
• A lack of adequate documentation of income or assets.
• The presence of recent bankruptcies or foreclosures.
• Financing for nonstandard or luxury property types.

Types of Nonconforming Loans

While jumbo loans represent the largest segment of the nonconforming market, other loan types also fall under this category:

1. Jumbo Loans
These are mortgages that exceed the conforming loan limits set by the FHFA. They are typically used to finance high-value homes, particularly in urban markets or affluent neighborhoods. Because of their size, jumbo loans are not eligible for purchase by GSEs and are instead held in lenders’ portfolios or sold to private investors.

2. Subprime Loans
Loans made to borrowers with credit issues or limited financial history may be classified as nonconforming. Subprime loans became widely known during the 2008 financial crisis due to their role in the housing market collapse. Today, lenders use more regulated criteria when offering these products, but they remain outside the conforming framework.

3. Alt-A Loans
Alt-A (Alternative A-paper) loans are issued to borrowers with relatively good credit but nontraditional documentation, such as self-employed individuals who may have fluctuating income or lack standard tax returns. These loans may not conform due to the documentation level rather than the credit profile.

4. Non-QM Loans
Non-qualified mortgages (non-QM) also fall into the nonconforming category. These are loans that do not meet the Consumer Financial Protection Bureau’s (CFPB) definition of a qualified mortgage, often due to debt-to-income ratios, loan features, or repayment structures that are outside typical limits.

Risk Considerations and Pricing

Because nonconforming loans do not have a secondary market guarantee through Fannie Mae or Freddie Mac, lenders retain more exposure to risk. This risk is typically priced into the mortgage through higher interest rates, larger down payment requirements, or more conservative underwriting terms. Lenders may also require higher reserves or implement more detailed manual underwriting procedures.

Borrowers may still find nonconforming loans attractive, especially if they have specific needs not met by conforming loan options. However, the lack of GSE backing means fewer protections in some cases and potentially less flexibility in renegotiating terms.

Impact on Borrowers

Nonconforming loans are neither inherently better nor worse than conforming loans—they serve different market segments. For many borrowers, particularly those purchasing expensive homes, self-employed individuals, or those with complex financial profiles, nonconforming loans provide essential access to credit.

That said, borrowers should carefully assess the total cost of borrowing under a nonconforming structure. This includes interest rates, fees, and the long-term impact of any nonstandard terms. Working with a knowledgeable lender or mortgage broker is often helpful in navigating the variety of loan products and determining the most appropriate fit.

The Bottom Line

A nonconforming loan is any mortgage that fails to meet the criteria established by Fannie Mae and Freddie Mac. These loans include jumbo loans, subprime loans, Alt-A loans, and non-QM loans. They often come with stricter terms or higher costs but serve an important role for borrowers with unique financing needs or those purchasing properties that exceed conforming loan limits. Understanding the distinction between conforming and nonconforming loans helps borrowers make informed decisions about the mortgage products available to them.