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Loading...Loading...A government-sponsored enterprise like Fannie Mae, Freddie Mac, or Ginnie Mae issues or backs an agency MBS. This gives investors a safety net that is linked to the government.
Here's a short answer to the question of what happens to your mortgage after you close on a home: it usually gets sold. Lenders don't just sit on loans and wait for you to pay them back every month for thirty years. Instead, they put those loans together, package them into bonds, and sell them to investors on the secondary market. The whole thing is called securitization, and the bonds that come out of it are called mortgage-backed securities. Investors will keep using this system as long as they believe they will get their money back.
An agency MBS is a type of mortgage-backed security that is backed by one of three organizations that are connected to the federal government. Ginnie Mae is a government-owned company that backs loans that are insured by the Federal Housing Administration and the Department of Veterans Affairs. Fannie Mae and Freddie Mac are government-backed companies that buy and guarantee regular loans that meet their underwriting standards. Because these three groups are responsible for the payments, agency MBS are thought to be among the safest fixed-income investments available.
If you're just trying to buy a house, why does any of this matter? This market is what keeps the money for mortgages coming in. When investors trust agency MBS, lenders have more money to lend, which usually means better rates for you. If the MBS market gets tighter, lending will slow down and rates will go up. You won't see the letters "MBS" on your closing documents, but these securities have a direct link to the interest rate on your loan.
The journey of an agency MBS starts with individual home loans. Let's say a lender closes fifty $300,000 mortgages in a single month. Rather than hold all of that risk on its own books, the lender will sell those loans to Fannie Mae, Freddie Mac, or into a Ginnie Mae pool. The buying entity groups loans with similar traits, like the same interest rate and maturity date, into a single pool. That pool then gets turned into a security that investors can buy and sell on the open market.
Each month, when borrowers make their mortgage payments, the principal and interest flow through to the investors who hold the MBS. The process works a lot like a pipeline. Your payment goes in one end, and investors receive their share on the other, minus small fees for the loan servicer and the guarantor. You won't have to worry about where your payment goes once it leaves your account, but knowing the path it takes will help you understand why rates move the way they do.
The most common structure is called a pass-through. It's straightforward: payments pass through from borrower to investor in a more or less direct line. More complex versions, called collateralized mortgage obligations, split those payments into different slices, each with different risk and return profiles. But at the core, it's the same basic idea. Homeowners pay their mortgages, and those cash flows end up in the hands of bond investors. When you close a loan with AmeriSave, your mortgage can become part of this same process, helping keep the money flowing for the next borrower in line.
Not all mortgage-backed securities come with the same safety net, and the difference will matter to you as a home buyer even if you never invest in a single bond. The big dividing line is whether a government or quasi-government entity guarantees the payments. If they do, you have an agency MBS. If they don't, you have a non-agency MBS, and the rules change quite a bit.
Agency MBS have a guarantee behind them. If a borrower defaults on a loan inside a Ginnie Mae pool, the federal government covers the loss. Ginnie Mae bonds carry the full faith and credit of the United States, which puts them on almost the same footing as Treasury bonds from a credit risk standpoint. Fannie Mae and Freddie Mac don't have that explicit guarantee, but they've been in federal conservatorship since the financial crisis, and the market treats their MBS as carrying very low credit risk. According to the SEC, most MBS in the United States are issued by these three entities.
Non-agency MBS, sometimes called private-label MBS, are put together by banks and investment firms without any government backing. The loans inside these pools often don't meet agency underwriting rules. Think jumbo loans, interest-only mortgages, or loans with higher risk profiles. If borrowers default, investors absorb the losses starting with the lowest-ranked tranche of the security. They don't get any government backstop to cover the gap.
That higher risk means non-agency MBS typically pay higher yields than their agency counterparts. But as the financial crisis showed, that extra yield can come with real pain. The subprime meltdown was driven largely by non-agency MBS backed by loans that never should have been made. In my thirty years working capital markets, that period stands out as a reminder that yield without quality is just risk in disguise. If you don't have the guarantee, you're the one left holding the bag when things go wrong.
Here's where agency MBS connect directly to the rate you'll get on a loan estimate from AmeriSave or any other lender. Bond prices and interest rates move in opposite directions. When demand for agency MBS goes up, the price of those bonds rises, and yields fall. Because mortgage rates track closely with MBS yields, lower yields will usually translate to lower mortgage rates for borrowers. This relationship has held true for decades.
The Federal Reserve is the single biggest buyer of agency MBS. When the economy needs a boost, the Fed can step in and buy massive amounts of these securities. That floods the market with demand, pushes bond prices higher, and pulls mortgage rates down. The Fed's balance sheet held roughly $2.5 trillion in agency MBS at its peak, according to the Federal Reserve Bank of New York. That's an enormous amount of buying power.
When the Fed starts pulling back, the opposite happens. Less demand means lower prices, higher yields, and higher mortgage rates. This is why you'll sometimes hear financial news anchors talk about the Fed "tapering" its MBS purchases. It's not abstract monetary policy. It directly affects what you have to pay each month on your home loan, and you can usually get a sense of the direction by watching what the Fed says about its MBS strategy.
Let's walk through this with real numbers so you can see the impact. Say you're looking at a $350,000 home loan with a 30-year fixed rate. When the Fed is actively buying agency MBS and pushing yields down, your rate might land around 5.75%. On that loan, your monthly principal and interest payment comes to about $2,043.
Now imagine the Fed has tapered its MBS purchases and investor demand has cooled off. MBS yields rise, and your rate bumps up to 6.75%. That same $350,000 loan now costs you about $2,270 per month. That's an extra $227 every month, or roughly $81,720 over the life of the loan. Same house, same loan amount, but a very different cost depending on where MBS yields sit when you lock your rate.
This is the kind of thing I think about every day in my role at AmeriSave. The secondary market drives the pricing that ends up on your rate sheet, and understanding that relationship can help you time your decisions. When you see headlines about the Fed buying or selling MBS, that's your cue to pay attention to what rates might do next.
The two biggest examples of the Fed stepping into the MBS market both happened during periods of serious economic stress. Looking at how those programs played out can give you a sense of the power these purchases carry and why they matter when you have skin in the game on a home purchase.
When credit markets froze in late fall of the financial crisis, the Fed announced it would start buying agency MBS and agency debt to get things moving again. The initial plan called for up to $500 billion in agency MBS purchases. That program expanded, and by the time it wrapped up, the Federal Reserve had bought $1.25 trillion in agency MBS. The goal was to bring down long-term interest rates, and it worked. Mortgage rates dropped, refinancing picked up, and the housing market slowly found its footing.
When the pandemic triggered lockdowns and economic uncertainty, the Fed dusted off the same playbook. The Federal Open Market Committee announced it would buy Treasury securities and agency MBS in whatever amounts were needed to keep markets stable. Initially, the target was at least $200 billion in agency MBS, but the actual purchases went well beyond that figure. Rates fell to historic lows, and millions of homeowners took the chance to refinance while millions of new home buyers entered the market. Lenders like AmeriSave saw enormous demand during that window, and borrowers who moved quickly locked in some of the lowest rates in decades.
You don't have to trade bonds or keep an eye on MBS coupon rates to use this information. You can make better decisions and get more out of your mortgage money by following a few simple rules.
First, pay attention to what the Fed says. If the Fed says it's going to buy more MBS or stop selling them, that can give you an idea of where rates might be going. You should check AmeriSave's rate page often so you can see how rates are changing over time. Instead of reacting to one headline, it's better to watch the Fed's tone over a number of meetings to get a better idea of where rates are going.
Second, keep in mind that mortgage rates don't change on their own. A network of bond markets, investor interest, and central bank policy links them all together. If rates are going in a direction you like, it often makes sense to lock in sooner rather than later. This is because the same forces that pushed rates down can quickly change direction. Be ready to do something when the time is right.
And third, talk to a lender before you have to. When you get prequalified with AmeriSave, you can see what rates you can get based on your credit, income, and down payment. That way, when the market is right for you, you're ready to go and won't have to rush to get your paperwork in order.
Agency MBS are the tools that keep the mortgage market going behind the scenes. These government-backed bonds link Wall Street investors with Main Street home buyers. The supply and demand for them directly affect the mortgage rates you see when you look for a loan. You don't have to become a bond trader, but knowing that agency MBS exist and how they move can help you make better decisions about when to buy and sell them. When you're ready to move forward, AmeriSave can help you find a loan and interest rate that work for you.
Treasuries and other regular bonds pay a set amount on a set schedule until they mature. Agency MBS work differently because the mortgages that back them up can be paid off early by refinancing or selling the home. That means that MBS cash flows are less predictable, which is why they usually have a higher yield than Treasuries with the same credit quality. SIFMA says that the agency MBS market is the second biggest fixed-income market in the US. You can use AmeriSave's mortgage rates page to see how the current MBS market affects the rates you can get.
Part of the reason lenders set their mortgage rates is because of the yield that investors want when they buy MBS. When there is a lot of demand for agency MBS, yields go down, and lenders can offer lower rates. When demand goes down, both yields and rates go up. One of the biggest things that affects that demand is the Fed's buying and selling of MBS. If you get prequalified with AmeriSave and keep an eye on rate trends as they happen, you can lock in competitive rates.
When it comes to credit risk, agency MBS are some of the safest bonds you can own. The federal government fully backs Ginnie Mae securities. Since the financial crisis, Fannie Mae and Freddie Mac MBS have been in conservatorship, which means that the government is backing them in some way. The SEC says that these three companies issue most of the MBS. This safety means that lenders can offer competitive rates to home buyers because investors are sure they will make money by buying these securities. AmeriSave keeps its lending costs low because the market is stable.
Yes, individual investors can buy agency MBS through brokerage accounts, mutual funds, or exchange-traded funds that focus on mortgage-backed bonds. You don't have to buy the whole pool. Most individual investors get their MBS exposure through bond funds that follow the Bloomberg U.S. MBS Index. The SEC's Investor.gov site has useful information about how these securities work. If you want to buy a home instead of investing in bonds, AmeriSave's mortgage calculator can show you what your monthly payment would be at the current rates.
The chance that borrowers pay off their mortgages sooner than expected, usually by refinancing when rates go down, is called prepayment risk. When that happens, MBS investors get their money back sooner, but they have to reinvest it at lower rates. Credit risk is low in agency MBS, so this is the biggest risk. A report from the Philadelphia Federal Reserve says that prepayment risk is the most important basic issue for agency MBS holders. This means that rates can change quickly for home buyers when refinancing picks up. To stay up to date on current trends, check AmeriSave's rate page.
The Fed bought $1.25 trillion worth of agency MBS during the crisis and kept them on its balance sheet for years. It eventually started to sell off some of its assets through a process called quantitative tightening, which meant letting bonds that were about to mature roll off without reinvesting the money. The Federal Reserve Bank of New York says that after more rounds of purchases, peak agency MBS holdings reached about $2.5 trillion. This slow unwinding helped the rates rise in recent years. AmeriSave can help you get prequalified so you're ready when rates drop if you're watching them for a good time to buy.
Lenders sell loans to MBS pools to get cash that they can use to make new loans. If a lender had to keep every mortgage it made, it wouldn't have enough money to lend for very long. Lenders can keep the pipeline open by selling loans on the secondary market. Fannie Mae calls this "providing liquidity to the mortgage market." This system means more competition among lenders and better rates for you as a borrower. AmeriSave is a part of this market, which helps keep rates low for people who want to borrow money.
The MBS market for agencies is huge. The Treasury market is the only one in the US that is bigger than this one. According to Western Asset, agency MBS make up about 27% of the Bloomberg U.S. Aggregate Bond Index. With hundreds of billions of dollars changing hands every day, it is one of the most liquid markets in the world. A large and liquid MBS market means that lenders always have money to lend, which helps keep mortgage rates low for people who want to buy a home. Check out AmeriSave to see what rates you can get today.
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