Mortgage-backed securities (MBS) help connect U.S. home loans to investors, and their yields are an important influence on mortgage rates. When investors demand a higher yield on agency MBS, that can put upward pressure on the rates lenders offer; when yields fall, it can support lower rates. The link is indirect: lenders’ costs, margins, competition, loan terms and borrower details all help determine an individual quote.
What mortgage-backed securities have to do with home loans
A mortgage-backed security is an investment backed by a pool of home loans. In the U.S. agency market, mortgages associated with Fannie Mae and Freddie Mac can be sold into or funded through secondary markets, where they are assembled into securities for investors. A pass-through security distributes cash generated by the underlying mortgages. The Federal Reserve’s Financial Accounts of the United States table description, published June 11, 2026, explains: “These obligations are largely pass-through securities, in which purchasers receive interest, amortization, and principal payments on the underlying mortgages.”
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That means investors’ returns depend on payments borrowers make, including interest and principal. The timing and amount of those cash flows can change as homeowners pay down loans or refinance. Investors therefore consider more than the stated interest rate when deciding what price to pay for an MBS.
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The term “agency MBS” refers to securities associated with the U.S. agency mortgage market. Private-label MBS are a distinct category; the discussion here concerns agency MBS and U.S. mortgage pricing, not a detailed comparison of private-label securities or mortgage systems in other countries.
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How an MBS yield can influence a mortgage rate
Mortgage lenders originate loans, then assess the value of selling or hedging them in the secondary market. Agency MBS yields are one important part of that calculation. The Federal Reserve’s July 2026 Monetary Policy Report describes agency MBS yields as an important factor in setting home mortgage interest rates.
The basic relationship between a security’s price and yield runs in opposite directions: when the price of an MBS rises, its yield falls; when its price falls, its yield generally rises. If investors require a higher yield, the economics of selling or hedging a mortgage can become less favorable for a lender. That can put upward pressure on the rate offered to a new borrower. If MBS yields decline, the secondary-market backdrop can support lower mortgage rates.
This is a directional rule, not a conversion formula. A one-point move in an MBS yield does not guarantee an equal move in a mortgage quote. Primary mortgage rates and MBS yields are related prices, but they are not identical: lenders also account for costs, risk, competition and the margin they need to originate loans. Market movements elsewhere can offset or reinforce an MBS move, and lenders may adjust margins rather than pass the full change through to borrowers.
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Why investors care about prepayments and risk
An MBS does not behave exactly like a bond with a fixed schedule of principal payments. Homeowners can pay down their loans over time, and some may refinance, changing when investors receive principal. Investors price securities with those possible cash-flow changes in mind, alongside duration and volatility risk. The return they require can therefore reflect uncertainty about both the size and timing of payments.
This helps explain why the market’s reaction is not always captured by looking at one interest-rate measure. A change in the yield investors require can reflect shifts in expected returns and risk premiums as well as movements in broader interest rates. The Federal Reserve’s research on large-scale asset purchases describes effects on MBS yields and mortgage rates that depend on the amount of securities held and prevailing market conditions—not a fixed, automatic pass-through to household rates.
What happens when the Federal Reserve buys MBS
When the Federal Reserve buys agency MBS, it adds a large source of demand for those securities. All else equal, stronger demand can bid up MBS prices and lower their yields. The purchases can also affect investors’ decisions about the rest of their portfolios: if securities are removed from private holdings, investors may rebalance into other assets, influencing prices and the returns they require more broadly. This portfolio-rebalancing channel can contribute to the effect.
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Federal Reserve studies have found that large-scale purchases lowered MBS yields and mortgage rates beyond what changes in market expectations alone would suggest. They also emphasize that a substantial market share may be needed for significant effects. The size of any impact depends on the scale of holdings and market conditions, so the direction of the mechanism does not establish a universal amount of rate relief.
The Fed does not directly set mortgage rates. Its purchases can influence the market for MBS, which in turn can affect lenders’ pricing backdrop. Nor does a change in the federal funds rate map one-for-one to a mortgage rate. Mortgage rates reflect several markets and lender-specific decisions, not a single policy rate.
What historical estimates show—and what they do not
Federal Reserve studies of crisis-era purchase programs illustrate that MBS-related measures can matter, while also showing why the observed mortgage rate cannot be attributed to MBS alone. The figures below are estimates for particular historical episodes or a particular model, not predictions for current or future programs.
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| Estimate | What the Federal Reserve study assessed | How to interpret it |
|---|---|---|
| About 85 basis points | A 2011 Board of Governors study estimated that mortgage rates declined by this amount between November 25 and December 31, 2008, after the MBS program announcement and before purchases began. | An episode-specific estimate following an announcement, not a general effect size for later purchases. |
| Roughly 50 basis points | The same 2011 study estimated a decline of roughly this size in abnormal risk premiums embedded in mortgage rates after MBS purchases started. | Observed mortgage rates declined only slightly in that period because general interest rates were rising; the risk-premium estimate is not the same as the change in the quoted mortgage rate. |
| About 5.6 basis points in MBS yields and about 5 basis points in mortgage rates | A 2012 Board of Governors study modeled the effect of a $100 billion increase in Federal Reserve MBS holdings. | These are model estimates under that paper’s assumptions, not an observed universal rule or a forecast for a present-day purchase. |
The crisis-era study concluded that purchases removed risk premiums and helped re-establish a robust secondary mortgage market. Its estimated effects belong to that period and the study’s methods. They should not be carried forward as a forecast for today’s rates or treated as a promise that an announced purchase program will produce the same result.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How to read current MBS and mortgage-rate measures
Measures need dates and definitions. The Federal Reserve’s July 2026 Monetary Policy Report reports mortgage commitment rates through July 1, 2026. For dates after May 31, 2019, it uses the 30-year uniform MBS current coupon as its agency MBS yield measure. Its spread measure compares that yield with the average of the 5-year and 10-year nominal Treasury yields.
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1Fix the driver behind crashes, sound loss and screen glitches2Clear out junk files and repair common Windows errors3Scan for outdated or missing drivers - takes under a minuteThese definitions are useful when interpreting a chart or report, but the report’s July 1 observations are not live mortgage quotes for October 2026. A quoted MBS yield, a Treasury yield and a lender’s current rate sheet refer to related but different measures. Check the date, security or loan type, and measure being compared before drawing conclusions about whether a move in one should have changed another.
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Why your personal mortgage quote may move differently
A borrower’s offered rate reflects more than the market yield on agency MBS. The Federal Reserve identifies several factors that may affect the price and terms a borrower receives:
- Credit history: A borrower’s credit profile can affect loan pricing.
- Debt-to-income ratio: The amount of debt relative to income is among the factors lenders may consider.
- Loan-to-value ratio: The loan size compared with the property value can influence pricing.
- Funding costs and lender margins: The lender’s own costs and the margin it retains can change how market moves reach a quote.
- Loan product and terms: Loan type and whether the rate is fixed or variable affect the offer.
- Whether the lender holds or sells the loan: A lender’s approach to the loan can affect its pricing decisions.
- Origination channel: Working through a lender’s loan officers or an independent broker may be associated with different prices or terms.
Consequently, two borrowers—or two lenders quoting on the same day—may not receive the same rate even against the same broad MBS backdrop. The rate sheet also reflects the loan’s terms and the lender’s pricing choices. A market yield can be moving in one direction while the quote for a particular borrower changes less, changes later, or does not change at all.
How to compare mortgage offers when MBS yields move
Use market movements as context, not as a substitute for comparing actual offers. The Federal Reserve advises borrowers to shop, compare and negotiate loan prices and terms. Ask lenders to quote comparable loans on the same date and review the whole offer, not just its headline interest rate.
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- Request matching loan terms. Compare the same loan type, fixed or adjustable structure, loan term and other relevant assumptions. A difference in product or eligibility assumptions can make two rates incomparable.
- Record the quote date. Mortgage pricing can change with market conditions. Offers from different dates may reflect different MBS yields and other market movements.
- Compare rate, APR, points and fees. The contract rate alone does not describe all borrowing costs. The Federal Reserve explains that APR incorporates the contract rate, points and fees, and certain other finance charges.
- Check the terms and your assumptions. Confirm that the quotes use the same borrower, credit and loan details, and compare any differences in costs or conditions.
- Ask whether the lender can improve the offer. The Fed advises borrowers to negotiate as well as shop. Request a clear explanation of what is driving the price and whether any available option changes the rate, points or fees.
APR is useful for comparing certain costs, but it does not replace reading the loan terms. The Federal Reserve’s discussion of HMDA rate spreads applies only to specified higher-priced loans; those spreads are not a general measure for every mortgage offer.
A practical way to interpret an MBS headline
When a report says MBS yields rose or fell, the first implication is about the market backdrop: all else equal, a lower yield can support lower mortgage rates, while a higher yield can put upward pressure on them. The next question is whether other forces moved at the same time, including broader interest rates and lender margins. The final question is whether the specific loan you want is priced differently after accounting for your borrower profile, loan terms and lender.
That sequence avoids two common errors: assuming the Federal Reserve directly sets a household’s mortgage rate, and assuming a market yield change must appear in full in every borrower’s quote. MBS yields matter because they affect the secondary-market economics of mortgages, but they are one part of a multi-factor pricing process.
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