Fannie Mae and Freddie Mac won’t loan you a dime, and yet they have a huge role in the mortgage marketplace. What are they, and why do they matter? The answer involves trillions of dollars and the way homes are financed.
To understand the value of Fannie Mae and Freddie Mac, let’s start with Smith Mortgage — a lender in your town with $12 million available to finance local homes.
If buyers want $250,000 for the typical mortgage, it means Smith can finance 48 homes. That’s it. Once it has originated 48 loans, it has burned through all of its available capital (48 x $250,000 = $12 million). If you are borrower #49, you’re out of luck — there’s no money for you.
This is not just a borrower problem. To stay in business, Smith requires more cash. To earn new fees and profits, it needs more loan originations.
What can Smith do? It can raise money by selling off assets — and the important asset it has is those 48 loans.
Smith could advertise and say it has loans for sale, but that raises a lot of questions: What’s the interest rate for each loan? What are the borrower credit scores? How much money was put down? Does each borrower have the ability to repay? Are there prepayment penalties or balloon payments?
You can see the problem. Two $250,000 mortgages may have very different terms and thus very different values for investors. Figuring out the marketplace worth of each loan might require dozens of calculations or more.
With Fannie Mae and Freddie Mac, such concerns largely disappear.
The Secondary Market
The mortgage lenders you see online and down the street are public-facing financing sources. Behind the scenes, there’s what’s called an electronic “secondary market” that makes a lot of mortgage lending possible.
The most prominent players in the secondary market are Fannie Mae and Freddie Mac — companies started by the federal government and also known as GSEs, or government-sponsored enterprises.
The system works like this:
Fannie Mae and Freddie Mac raise money from investors worldwide — including pension funds, insurance companies, ultra-wealthy individuals, and sovereign wealth funds that countries use to diversify their economies.
With cash on hand, Fannie Mae and Freddie Mac turn around and say to mortgage lenders: “We’ll buy your mortgages if they meet our standards.”
Smith Mortgage knows that the GSEs have cash and that it can quickly sell its 48 mortgages if they meet GSE standards. Mortgages that the GSEs buy are called “conforming” loans because they conform to Fannie Mae or Freddie Mac requirements.
Once it sells its loans, Smith Mortgage has new capital — money it can use to originate additional loans, generate more revenue, and earn new profits.
It can also happen that Smith may not want to sell all of its mortgages right away, or at all. The loans it keeps are called “portfolio” loans. Such loans don’t have to meet conforming standards, but they often do — just in case Smith wants to sell them quickly in the future.
Fannie Mae, Freddie Mac & Conforming Mortgage Standards
Smith has a ready market for its mortgages because they’re conforming loans. But what does that actually mean?
You could check the Fannie Mae single-family guidelines — the most recently published edition runs over 1,000 pages. A more practical approach is to look at a few of the key standards that conforming mortgages must meet:
- Loan limits: There is a conforming loan limit that depends on the number of units being financed (1–4), the jurisdiction where they are located, and whether the property is in a “high-cost” area. Those who need larger loans must apply for “jumbo” financing.
- Debt-to-income ratio: Conforming rules generally allow a 45% debt-to-income (DTI) ratio for qualified borrowers, though lenders will sometimes allow additional debt for borrowers with compensating factors such as a larger down payment, higher credit scores, or greater reserves.
- Down payment and equity: Lenders generally prefer purchasers to put down 20%, but conforming loans are available with as little as 3% down when mortgage insurance is included.
- Credit score: Conforming loans require a minimum credit score to qualify. Individual lenders may set their own minimum above the baseline — for example, Refi.com requires a minimum score of 620 for conventional purchase loans and 620 for conventional rate-and-term refinances.
The purpose of these guidelines is to reduce marketplace risk — not just for borrowers, but for lenders and investors as well. The benefits of a low-risk marketplace include lower mortgage rates, fewer foreclosures, and an ongoing supply of investor capital to local markets, whether you live in a large metro area or a small town.
The Worldwide Market for US Mortgages
In the same way that lenders can sell their loans in the secondary market, Fannie Mae and Freddie Mac do something similar. They take their mortgages, bundle them together into mortgage-backed securities, and sell interests to investors in the US and overseas.
Investors know what they’re getting because all loans sold through the GSEs are conforming. And US mortgages are desirable worldwide because of our strong economy, stable legal system, and historically low loan default rates.
If you’re thinking about a conventional mortgage or refinance, Refi.com can help you navigate the process. See if you qualify for a lower rate or start your application with Refi.com today.
