What it means
When a bank or mortgage company lends money to a home buyer, that is the primary mortgage market. If the lender had to hold the loan for 30 years, it would run out of money to lend.
Instead, it can sell the loan on to another buyer, receive cash straight away and use it to fund more mortgages. The buyers include government-sponsored enterprises (GSEs), which are privately held companies created by the US government to support housing finance.
In the United States, Fannie Mae and Freddie Mac buy loans that meet set standards, while Ginnie Mae guarantees securities backed by government-insured loans. Many are packaged into mortgage-backed securities, which are investments paid from the borrowers' monthly payments.
This system brings money from global investors into home lending. It tends to lower mortgage rates and standardise loan terms because lenders originate loans to fit what buyers will accept.
Those standards cover the size of the loan, the borrower's credit and documentation. The risks became clear in the 2008 financial crisis, when poor lending standards were passed down the chain and investors lost money on mortgage-backed securities.
Reforms since then have tightened underwriting rules and risk retention requirements. The basic mechanism still operates, though with more oversight.
For businesses outside banking, the market matters because the cost and availability of home loans influence house prices, construction demand and consumer spending. Anyone selling to homebuyers or lending against property watches it closely.
Changes in mortgage rates often follow what is happening in this market. Servicing is a separate job from owning.
A company that collects payments, chases late borrowers and manages escrow accounts (money held to pay taxes and insurance) is called the servicer, and it is paid a small fee for this work. A loan can be sold to one investor while the original lender keeps the servicing.
In practice
Real-world examples.
Example
A local bank makes 40 mortgages averaging $250,000, a total of $10,000,000. It sells the whole group to a government-sponsored enterprise. The bank receives cash and can make another round of loans.
Example
A mortgage company sells $100,000,000 of loans to an investment bank, which bundles them into a mortgage-backed security. Investors buy the security and receive the monthly payments made by the borrowers. The mortgage company keeps a fee for collecting the payments.
Example
A credit union decides to keep its own loans to maintain relationships, but it sells some fixed-rate loans worth $5,000,000 to reduce interest rate risk. This frees up capital for new lending. It continues to service the loans so borrowers still deal with the credit union.
Formula
Calculation
Sale proceeds = loan balance x sale price (as a percentage of par)
A lender has made a $300,000 mortgage and sells it to an investor at a price of 101.5, meaning 101.5% of the balance. Proceeds are $300,000 x 1.015 = $304,500. The lender books a $4,500 premium over the loan balance and has $304,500 to lend again.Case study
Seen in the real world.
Greenfield Home Loans is a fictional lender that makes about $20,000,000 of mortgages each month. Without a way to sell them, its funds would be tied up and it would have to stop lending after a few months.
By selling the loans to investors each month, Greenfield recovers its cash and writes new loans. This is an illustrative story, but the principle is real. When investor appetite for mortgages dried up in a market shock, Greenfield had to cut back lending sharply, showing how dependent the lender had become on the secondary market.
The company's treasurer later set limits on how many loans it would hold on its own books at any time, and arranged a back-up line of credit so it could keep lending if buyers briefly stepped away. The extra preparation cost money, but it gave the lender more stability.
Watch out
Common mistakes.
- Assuming the borrower's loan terms change when a loan is sold. The interest rate and monthly payment stay the same, though the company collecting payments may change.
- Thinking the secondary mortgage market is where homes are sold. It trades loans, not properties.
- Treating it as risk-free for lenders. Lenders may have to buy a loan back if it did not meet the agreed standards.
Questions
People also ask.
What is the secondary mortgage market used for?
It lets lenders sell loans for cash so they can make new ones, and it connects housing finance to wider investors, which keeps more money available for home loans.
Who buys mortgages in the secondary market?
Buyers include government-sponsored enterprises, banks, investment funds and pension funds, often through mortgage-backed securities. Each buyer has its own appetite for risk, which is why loans are sorted by quality before they are sold.
Does the sale of my mortgage affect me?
Usually only in who you send payments to, because the loan terms stay the same. You will normally receive a letter telling you if the company collecting your payments changes.
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