What is Interest Rate Risk? How It Affects Stocks, Bonds and Loans
What is Interest Rate Risk?
Quick Summary:
Interest rate risk is the chance that a change in interest rates will lower the value of an investment or raise the cost of borrowing money. It touches almost every part of the financial system, from government bonds and mortgages to the stocks sitting in a retirement account. This article explains what interest rate risk is, how it works, and how it shows up in bonds, stocks and loans, with real examples from recent events.
Key Takeaways
- Interest rate risk is the risk that a change in interest rates affects the value of an investment or the cost of debt.
- Bond prices and interest rates move in opposite directions: when rates rise, the price of existing bonds falls.
- Longer-term bonds and low-coupon bonds are more sensitive to rate changes than short-term, higher-coupon bonds.
- Stocks, especially growth companies and banks, can also feel the effects of rate changes.
- Diversification, shorter maturities and rate hedging are common ways investors manage interest rate risk.
How Rising Interest Rates Affect Different Assets
| Asset or Instrument | Effect of Rising Rates |
|---|---|
| Existing bonds | Market price falls |
| Newly issued bonds / savings accounts | Higher yields for new buyers |
| Variable-rate loans | Monthly payments increase |
| Fixed-rate loans already taken | Payments unchanged, but refinancing costs more |
| Growth stocks | Often pressured, as future earnings are discounted more heavily |
| Bank stocks | Mixed: wider lending margins, but losses on existing bond holdings |
| Cash and short-term savings | Typically benefit from higher yields |
What is Interest Rate Risk?
Interest rate risk is the possibility that a rise or fall in market interest rates will change the value of an investment or the cost of a loan. It applies most directly to fixed-income investments like bonds, since a bond’s interest payment is locked in at issuance, but its market value keeps shifting as new bonds come out with different rates. Interest rate risk is not the same as credit risk, which is the chance that a borrower fails to repay debt at all — a bond can carry very low credit risk and still lose significant value if interest rates move against it.
How Does Interest Rate Risk Work?
Think of a bond as a fixed-rate loan agreement. If someone buys a bond paying 4% and the market later starts offering new bonds at 6%, the 4% bond becomes less attractive — the only way to sell it is to lower its price until the buyer’s effective return matches the new 6% rate. That’s why bond prices and interest rates move in opposite directions. The same logic runs through the wider economy: as official interest rates rise or fall, the price of nearly every existing fixed-rate asset adjusts to keep pace with new market rates.
Types of Interest Rate Risk
Interest rate risk generally shows up in three forms:
- Price risk (market risk): The value of an existing bond or fixed-income holding falls when rates rise.
- Reinvestment risk: When a bond matures or pays a coupon, that cash may have to be reinvested at a lower rate if rates have fallen since the original purchase.
- Yield curve risk: Short-term and long-term rates don’t always move together, so shifts in the shape of the yield curve can affect different bonds unevenly.
How Interest Rate Risk Affects Bonds
Bonds are the investment most exposed to interest rate risk, and the size of that exposure is measured using duration. A bond’s duration estimates roughly how much its price will move for every 1 percentage point change in interest rates — the higher the duration, the more responsive the bond’s price is to a rate change, and duration is driven mainly by time to maturity and coupon size.
The effect can be sizeable. A 20-year Treasury bond with a 3% coupon and a duration near 14.5 years could lose around 14.5% of its market value if rates climbed by a single percentage point, while a 5-year Treasury with a 5% coupon and roughly 4.5 years of duration would fall only about 4.5% under the same move. Importantly, this risk mainly shows up in a bond’s mark-to-market value — an investor who holds the bond until maturity, assuming the issuer doesn’t default, still collects every promised payment regardless of price swings along the way.
How Interest Rate Risk Affects Stocks
Stocks aren’t fixed-income instruments, but they aren’t immune to interest rate risk either. Higher rates raise the “discount rate” investors use to value a company’s future earnings, which tends to hit growth and technology stocks hardest, since more of their expected value sits years in the future. Rising rates also make bonds and savings accounts more attractive relative to stocks, which can pull some investor money out of equities altogether.
Bank stocks face a more direct, two-sided exposure. Rising rates can widen the margin banks earn between what they pay depositors and what they charge borrowers, which helps profits — but banks also hold large bond portfolios, and those portfolios lose market value the same way any other bond does when rates climb. That dynamic is exactly what unfolded at Silicon Valley Bank.
How Interest Rate Risk Affects Loans and Borrowing
For everyday borrowers and businesses, interest rate risk shows up directly in monthly payments. Loans with a variable or adjustable rate — many credit cards, some mortgages, and many business lines of credit — become more expensive as rates rise, since the interest charged is tied to a benchmark that moves with the market. A fixed-rate loan taken out before a rate increase is protected, since the payment stays the same. But anyone who needs a new loan, or wants to refinance an old one, faces higher borrowing costs once rates climb.
Real-World Example: Silicon Valley Bank
The clearest recent case of interest rate risk in action is the 2023 collapse of Silicon Valley Bank (SVB). SVB’s bond holdings grew from about $27 billion in March 2020 to roughly $128 billion by December 2021, largely parked in long-term government and agency bonds. Interest rates then climbed from 0.5% in May 2022 to 4.75% by February 2023, and because SVB’s older bonds paid far less than newly issued ones, their market value fell sharply — leaving SVB sitting on an unrealized loss of about $17 billion by the end of 2022.
That paper loss wasn’t fatal on its own, since SVB didn’t have to sell the bonds unless it needed the cash. But when SVB’s tech-industry depositors began withdrawing funds faster than the bank had planned for, it was forced to sell part of its bond portfolio at a loss to raise cash — which alarmed the market and triggered a bank run. Depositors pulled roughly $41 billion out of the bank in a single day, and regulators shut SVB down shortly after. The episode is now a standard example of how interest rate risk, combined with concentrated deposits and thin hedging, can threaten even a bank holding “safe” government bonds.
How to Measure Interest Rate Risk
Duration is the most common measure of interest rate risk for a single bond or a bond portfolio, expressed in years and used as a rough guide: a portfolio with a duration of 5 years will lose about 5% of its value for every 1 percentage point rise in rates, all else equal. A related measure, convexity, captures how that sensitivity itself changes as rates move, which matters more for larger rate swings. Investors don’t need to calculate these by hand — brokerages and fund fact sheets typically list a bond fund’s duration, which is enough to compare relative interest rate risk between different funds or bonds.
How to Manage Interest Rate Risk
- Shorten duration. Holding shorter-term bonds or bond funds reduces price sensitivity to rate changes.
- Ladder maturities. Spreading bond purchases across different maturity dates means only part of a portfolio is exposed to any single rate move.
- Diversify across asset types. Combining bonds with stocks, cash and other assets can offset losses in any one category.
- Consider floating-rate instruments. Some bonds and loans carry rates that adjust with the market, which reduces (but doesn’t eliminate) interest rate risk.
- Hold to maturity where possible. If cash isn’t needed before a bond matures, price swings along the way matter less.
- Use hedging tools. Larger investors sometimes use interest rate swaps or futures to offset rate exposure — generally more relevant for professional portfolios than individual investors.
Quick Checklist: Assessing Your Interest Rate Risk Exposure
- Do you hold individual bonds or bond funds with long maturities?
- Do you have variable-rate loans, credit cards or a mortgage tied to a moving benchmark?
- Does your portfolio lean heavily toward growth stocks sensitive to rate changes?
- Would you need to sell a bond before it matures if rates moved against you?
- Have you compared the duration of your bond holdings to your investment time horizon?
Final Thoughts:
Interest rate risk is simply the reality that money’s value shifts as interest rates shift. It’s most visible in the bond market, where prices and rates move in opposite directions, but it also reaches into stocks, mortgages, business loans and everyday borrowing costs. Understanding where interest rate risk shows up in a portfolio or budget makes it easier to plan around rate changes instead of being surprised by them.
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FAQs
Is interest rate risk the same as credit risk?
No. Interest rate risk is about how market value changes when interest rates move, while credit risk is about the chance a borrower fails to repay debt. A high-quality bond can have low credit risk but still carry meaningful interest rate risk.
Does interest rate risk affect savings accounts?
Not in the same way it affects bonds, since savings accounts don’t have a market price that can fall. Rising rates are generally good for savers, since banks tend to raise the interest they pay on deposits when overall rates go up.
Can I lose money from interest rate risk if I hold a bond until maturity?
Generally no, as long as the issuer doesn’t default. Interest rate risk mainly affects a bond’s price if it’s sold before maturity — a bond held to maturity still pays its full promised interest and principal.
Which investments carry the most interest rate risk?
Long-term, low-coupon bonds — including many long-dated government and zero-coupon bonds — carry the most interest rate risk, since more of their value is tied to distant future payments.
How do professional investors hedge interest rate risk?
Large investors often use tools like interest rate swaps, futures or options to offset the impact of rate changes on their portfolios, alongside more basic tools like shortening duration or laddering bond maturities.
Disclaimer
This article is for general educational purposes only and does not constitute financial, investment or legal advice. Interest rates, bond markets and monetary policy can change quickly. Readers should consult a licensed financial advisor before making investment or borrowing decisions.
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