Why Mortgage Rates Change
Understanding what drives mortgage rates
Mortgage rates, like the price of any good or service, can rise and fall based on supply, demand, and
market conditions. There are six main factors that influence mortgage rates. Lenders adjust the
cost of borrowing based on economic conditions, financial markets, and the level of risk associated
with each borrower. Because these factors are constantly changing, mortgage rates can move
daily—or even multiple times throughout the day when markets are particularly volatile.
1. Bond market yields
Mortgage rates are closely tied to the yield on long-term bonds, especially the 10-year U.S. Treasury
and mortgage-backed securities (MBS).
* The 10-Year U.S Treasury bond note (often shortened to 10 Year Treasury) Example, you give
the U.S govt $1,000, the govt pays you interest, after 10 years, the govt gives your $1,000
back. It’s a long-term bond.
* Mortgage-Backed Securities (MBS) -in short- the lender gives you a mortgage- the mortgage
is bundled together with thousands of other mortgages- that bundle is sold to investors.
In Simple Terms:
Bond yields go up → mortgage rates tend to go up.
Bond yields go down → mortgage rates tend to go down.
2. Inflation
Inflation means the cost of goods and services is increasing, which means the purchasing power of
your money is decreasing.
If inflation is expected to be high, the dollars the lender gets back in the future will be worth less
than today's dollars.
In Simple Terms:
Higher inflation → typically higher interest rates → typically higher mortgage rates
Lower inflation → typically lower interest rates → typically lower mortgage rates
3. Central Bank Policy
In the U.S., the Federal Reserve doesn't directly set mortgage rates However, changes to the
federal funds rate influence the broader economy and financial markets, which can indirectly
affect mortgage rates.
In Simple Terms:
Lower Fed Funds Rate → generally lower interest rates
Higher Fed Funds Rate → generally higher interest rates
4. Economic Conditions
* Strong economic growth can lead to higher rates because investors expect inflation and
increased borrowing.
* During economic slowdowns or recessions, rates often fall as investors seek safer assets
like government bonds.
5. Supply and demand for mortgages
In Simple Terms:
High demand: Lots of people want mortgages → lenders don't have to compete as
much → rates can be higher.
Low demand: Fewer people want mortgages → lenders compete for borrowers →
rates can be lower.
6. Credit risk
This is huge for lenders. This is often referred to as “Risk Based Pricing” Your individual
rate depends on factors such as:
Credit score
Down payment
Debt-to-income ratio
Loan amount
Loan type (fixed vs. adjustable)
Property type
Simple Terms:
Srtonger borrower → lower risk → potentially lower rate.
Higher-risk borrower → potentially higher rate.











