Why Higher Interest Rates Don't Always Mean Higher Bank Profits

Introduction

When central banks raise interest rates, it is tempting to assume that commercial banks will automatically become more profitable. After all, banks charge interest on loans, mortgages and other forms of credit. If borrowing rates increase, shouldn't banks earn more money?

The answer is not necessarily.

Banks operate on both sides of the interest rate equation. They earn interest from borrowers and investments, but they also pay interest to depositors and other funding providers.

Higher interest rates can initially improve the difference between these amounts. However, they may also increase funding costs, weaken borrowers' repayment capacity, reduce lending demand and create losses on fixed-income investments.

A bank can therefore report rising interest income while experiencing declining overall profitability.

The relationship between interest rates and bank earnings is particularly important for understanding banking systems in the United States, Europe, the United Kingdom, Asia and emerging markets.

To understand why higher rates do not always translate into higher profits, it is necessary to examine how banks generate income, manage their balance sheets and respond to changing financial conditions.

1. How Banks Earn Money From Interest

Traditional commercial banking is based largely on financial intermediation.

Banks accept deposits and obtain funding from other sources. They use those funds to provide loans, purchase securities and undertake other interest-earning activities.

The interest received from loans and investments represents interest income.

The interest paid on deposits and borrowings represents interest expense.

The difference is known as Net Interest Income (NII).

Net Interest Income = Interest Income − Interest Expense

For example, consider a hypothetical bank with the following annual figures:

The bank earns $100 million in interest income but incurs $50 million in funding expenses.

Its net interest income is therefore $50 million.

However, net interest income should not be confused with net profit.

Banks must also account for staff expenses, technology investments, regulatory compliance costs, expected credit losses, taxes and other financial results.

Even when net interest income increases, these additional expenses can reduce overall earnings.

Understanding Net Interest Margin

Another important measure is Net Interest Margin (NIM).

Net interest margin measures how much net interest income a bank generates relative to its average interest-earning assets.

Net Interest Margin = (Net Interest Income ÷ Average Interest-Earning Assets) × 100

Suppose a bank earns $50 million in annual net interest income from $1.5 billion in average interest-earning assets.

Its net interest margin is approximately 3.33%.

A higher NIM generally indicates stronger interest income generation relative to earning assets.

However, a rising NIM does not automatically guarantee an increase in net profit.

2. Why Higher Interest Rates Can Initially Benefit Banks

When central banks increase policy interest rates, commercial banks may be able to charge higher rates on newly issued loans and existing floating-rate credit facilities.

For example, business loans linked to benchmark rates may automatically become more expensive when those benchmarks increase.

Banks may also earn higher yields when existing investments mature and the proceeds are reinvested.

Meanwhile, deposit interest rates may adjust more slowly.

This difference in repricing speed can initially improve a bank's interest spread.

Consider a simplified example:

In this example, interest-earning asset yields increase faster than funding costs.

The bank's simplified interest spread improves by one percentage point.

However, the illustration assumes comparable asset and funding characteristics. A bank's actual NIM also depends on its asset and liability balances.

The benefit of higher interest rates also depends on the proportion of floating-rate loans, deposit pricing, loan maturity structures and the bank's ability to manage interest rate risk.

Research by the Bank for International Settlements (BIS) has highlighted that interest-rate changes can affect banks differently depending on their balance-sheet composition and funding structure.

3. Rising Deposit Costs Can Reduce Bank Profits

One of the most significant challenges for banks during a prolonged high-interest-rate environment is the increasing cost of deposits.

When benchmark interest rates rise, depositors may expect higher returns on their savings.

Households and businesses can compare deposit rates with alternative investments, including government securities, money market funds and competing bank products.

If banks do not offer sufficiently attractive returns, they may lose deposits.

To retain existing customers and attract new funds, banks may increase the interest rates paid on savings accounts, term deposits and other deposit products.

This directly raises their funding expenses.

What Is Deposit Beta?

Banking analysts use the term deposit beta to measure how much deposit rates change relative to benchmark interest rates.

For example, suppose a central bank increases its policy rate by two percentage points.

If a commercial bank raises its deposit interest rate by one percentage point, the simple deposit beta is 50%.

Banks with relatively low deposit betas may initially benefit more from rising interest rates because their funding expenses adjust slowly.

Banks operating in highly competitive deposit markets may experience higher deposit betas and greater pressure on margins.

There is also a timing effect.

Even after central banks stop increasing rates, deposit costs may continue rising as older, lower-rate deposits mature and customers move into newer, higher-yielding products.

This phenomenon can gradually reduce the initial profitability advantage created by higher lending rates.

Consequently, a bank that benefits from an early phase of monetary tightening may experience margin compression later in the interest rate cycle.

4. Higher Interest Rates Can Increase Loan Defaults

Higher borrowing costs can place significant pressure on households and businesses.

Borrowers with floating-rate loans may face higher monthly repayments, while those with fixed-rate loans may experience increased costs when they refinance.

For households, higher mortgage payments can reduce disposable income.

For businesses, rising interest expenses can weaken cash flow and make debt servicing more difficult.

Consider a hypothetical company with $10 million in floating-rate debt.

Assuming the principal remains unchanged, a three-percentage-point increase in the borrowing rate adds $300,000 to the company's annual interest expense.

If the company's revenues do not increase sufficiently, its financial position may deteriorate.

For the lending bank, this creates additional credit risk.

How Credit Risk Affects Profitability

When borrowers struggle to repay loans, banks may experience:

• Higher loan delinquencies and defaults.
• Increased expected credit-loss provisions.
• Greater loan restructuring and recovery expenses.
• Reduced interest collection.
• Lower overall profitability.

Under accounting frameworks such as IFRS 9, applicable banks recognize expected credit losses using forward-looking assessments.

In the United States, applicable institutions follow the Current Expected Credit Losses (CECL) framework.

Although the accounting approaches differ, both require banks to recognize credit risk through provisions or allowances that can reduce reported earnings.

A bank may therefore charge higher interest rates while simultaneously recording higher credit-loss expenses.

The additional lending revenue may be insufficient to compensate for deteriorating asset quality.

This illustrates an essential banking principle:

Higher interest charged does not necessarily mean higher interest successfully collected.

5. Rising Interest Rates Can Reduce the Value of Bank Investments

Commercial banks hold government bonds, corporate debt securities and other fixed-income instruments for liquidity management, investment income and balance-sheet purposes.

However, fixed-rate bonds are exposed to interest rate risk.

When market interest rates rise, the market value of existing fixed-rate bonds generally declines.

This occurs because newly issued bonds may offer higher yields than older securities.

An Illustrative Bond Example

Suppose a bank purchases a ten-year government bond paying a fixed annual coupon of 2%.

If comparable newly issued bonds begin offering 5%, the older bond becomes less attractive.

Its market price generally falls to reflect the difference in yields.

For banks holding substantial fixed-income portfolios, these valuation declines can create significant financial challenges.

The consequences depend on how the investments are classified, their accounting treatment and whether the bank needs to sell them.

Unrealized Losses Versus Realized Losses

An unrealized loss occurs when the market value of an investment falls below its carrying or purchase value, but the bank has not sold the security.

A realized loss occurs when the bank sells the investment at a loss.

These distinctions matter because accounting treatment differs across financial reporting classifications and jurisdictions.

Not every decline in a bond's market value immediately reduces the bank's reported net income.

However, unrealized losses can still create liquidity, capital or confidence concerns.

If a bank experiences substantial deposit withdrawals, it may need to sell securities to raise cash.

Selling lower-yielding bonds during a high-rate environment may crystallize previously unrealized losses.

Lessons From the 2023 US Banking Turmoil

The failure of Silicon Valley Bank in March 2023 demonstrated how interest rate risk and liquidity risk can interact.

The bank had substantial investments in longer-duration fixed-income securities.

As market interest rates increased, the market value of those securities declined.

At the same time, concentrated deposits and rapid customer withdrawals intensified liquidity pressures.

The bank's failure was not caused simply by higher interest rates. It involved a combination of interest rate exposure, concentrated funding, liquidity management weaknesses and depositor behavior.

The episode demonstrated that higher market rates can expose vulnerabilities even in banks holding substantial amounts of government-backed securities.

For banks worldwide, the lesson is clear: interest rate risk must be assessed across the entire balance sheet, not solely through lending income.

6. Higher Borrowing Costs Can Weaken Loan Demand

High interest rates affect not only existing borrowers but also potential new borrowers.

When the cost of credit increases, households may postpone home purchases, vehicle financing and other major expenses.

Businesses may delay expansion projects, equipment purchases or investments financed through borrowing.

Real estate developers may reconsider projects when financing costs rise and expected returns become less attractive.

As a result, banks may experience slower loan growth.

Even when interest rates on individual loans increase, a reduction in lending volume can limit total interest income.

Consider two hypothetical banks:

Despite charging a higher average lending rate, Bank B generates less gross interest income because its loan portfolio is smaller.

This simplified example assumes the stated yields apply to the average outstanding balances throughout the year.

The broader implication is important.

Bank profitability depends on both the price of credit and the volume of performing loans.

Higher lending rates cannot fully compensate for declining loan demand, particularly when funding and operating costs remain elevated.

7. The Yield Curve Can Influence Bank Profitability

The yield curve shows the relationship between interest rates and the maturities of debt instruments.

Under a normal upward-sloping yield curve, longer-term interest rates are generally higher than shorter-term rates.

Banks often engage in maturity transformation by accepting relatively short-term deposits and providing longer-term loans.

This creates opportunities to earn income from differences in yields and funding costs.

However, banks also face risks when market interest rates change.

What Happens When the Yield Curve Inverts?

An inverted yield curve occurs when short-term interest rates exceed longer-term rates.

This can create pressure on banks that rely heavily on short-term market funding while holding longer-term fixed-rate assets.

For example, suppose a bank must obtain new short-term funding at 5%, while certain existing long-term fixed-rate loans yield only 4%.

Funding those loans entirely at that cost would create a negative interest spread before operating expenses and credit losses.

In practice, banks use combinations of deposits, wholesale borrowing, capital and hedging instruments, so their actual financial results will differ.

Nevertheless, the example shows why the overall level of interest rates is not enough to assess bank profitability.

The shape of the yield curve, asset repricing, liability repricing and funding stability are equally important.

8. Why Interest Rate Changes Affect Countries Differently

The relationship between interest rates and bank profits varies across international banking systems.

Different countries have different mortgage structures, deposit markets, regulatory arrangements, monetary transmission mechanisms and funding practices.

Consequently, the same increase in benchmark rates may create significantly different results for banks operating in different markets.

United States

US banks may experience relatively rapid repricing of certain commercial and floating-rate loans.

However, profitability also depends on deposit competition, wholesale funding costs and exposure to fixed-rate securities.

Banks with substantial longer-duration securities portfolios can face valuation pressures when market yields rise.

Euro Area

Banks across the euro area operate under the monetary policy framework of the European Central Bank.

However, national banking markets differ in deposit competition, lending practices and the share of fixed-rate versus floating-rate loans.

These structural differences can produce varied profitability outcomes even under a common monetary policy.

United Kingdom

UK bank profitability is influenced by mortgage refinancing patterns, savings deposit competition, wholesale funding markets and interest rate hedging arrangements.

Changes in policy rates may affect mortgage yields and deposit costs at different speeds.

India and Emerging Asian Markets

Many banks in India and other emerging Asian economies operate in markets where deposit mobilization, lending growth and credit quality are major determinants of profitability.

Higher lending yields may improve interest income, but competitive deposit pricing and rising borrowing costs can reduce the benefits.

The share of floating-rate lending, the structure of benchmark-linked loans and domestic regulatory requirements also affect outcomes.

Other Emerging Markets

Banks in some emerging economies may face additional risks associated with exchange-rate volatility, inflation, foreign-currency borrowing and less stable wholesale funding conditions.

For these institutions, interest rate changes can affect profitability through multiple channels, including currency movements and borrower repayment capacity.

These regional characteristics are broad considerations, not universal rules.

Individual bank balance sheets and risk management practices often matter more than geographic location alone.

9. A Practical Example: How Higher Interest Income Can Coincide With Lower Profits

Consider a hypothetical international commercial bank reporting its financial performance before and after a significant increase in interest rates.

In this example, interest income rises from $800 million to $1.1 billion, representing a 37.5% increase.

Net interest income also increases from $500 million to $550 million.

However, the bank's profit before tax falls from $220 million to $90 million, a decline of approximately 59%.

Several factors explain this outcome.

First, interest expense increases substantially because the bank must pay more for deposits and other funding.

Second, credit-loss provisions rise as some borrowers experience difficulty servicing their debts.

Third, operating expenses increase, while other financial losses further reduce earnings.

The bank is earning more interest, but its overall financial performance is weaker.

This is why banking analysts distinguish between revenue growth, net interest income growth and sustainable profitability.

Key takeaway: A bank's profitability depends not only on the interest rates it charges but also on its funding costs, asset quality, operating efficiency and exposure to financial risks.

Note: These figures are hypothetical and provided solely for educational purposes.

10. Important Indicators for Evaluating Bank Profitability

Investors, banking professionals and financial analysts should evaluate several indicators when examining the effect of higher interest rates.

These indicators should be interpreted together.

For example, a bank with a rising net interest margin but rapidly increasing credit losses may not be experiencing an improvement in underlying financial health.

Similarly, attractive returns on equity may be unsustainable if they depend on excessive leverage or inadequate risk provisions.

A comprehensive assessment must consider profitability, capital, liquidity, funding stability and asset quality.

11. Can Lower Interest Rates Sometimes Improve Bank Profits?

Lower interest rates do not necessarily harm banks.

Although falling rates may compress lending spreads, they can also improve broader economic and financial conditions.

Borrowers may experience lower debt-servicing costs, reducing credit stress and potentially lowering loan-loss provisions.

Businesses may become more willing to borrow for expansion, while households may increase mortgage and consumer-credit demand.

Lower market yields can also increase the market value of existing fixed-rate securities.

Furthermore, banks may benefit from stronger economic activity and improved borrower confidence.

For example, a bank experiencing lower net interest margins might still generate higher overall profits if credit losses decline significantly and lending volumes increase.

However, falling rates can also reduce asset yields faster than funding costs, particularly when deposit rates are already low.

The overall effect therefore depends on each bank's balance-sheet structure and the broader economic environment.

Neither rising nor falling interest rates guarantee higher bank profits.

12. How Banks Manage Profitability Across Interest Rate Cycles

Successful banks do not rely exclusively on whether interest rates are increasing or decreasing.

They actively manage the sensitivity of their assets, liabilities, revenues and expenses to changing financial conditions.

Asset-Liability Management

Asset-liability management (ALM) helps banks assess and manage mismatches between the repricing and maturities of their assets and funding.

It is especially important for managing interest rate risk in the banking book.

Banks use repricing analysis, scenario modelling and other risk-management techniques to understand how interest rate changes may affect earnings and economic value.

Funding Diversification

Banks may reduce funding concentration by maintaining a diversified deposit base and access to appropriate alternative funding sources.

Stable and diversified funding can help limit exposure to sudden increases in borrowing costs or unexpected withdrawals.

Credit Risk Management

Strong credit underwriting, ongoing borrower monitoring and appropriate loan-loss provisioning help banks manage deterioration in asset quality.

During high-interest-rate periods, particular attention may be required for highly leveraged borrowers and customers with substantial floating-rate debt.

Interest Rate Hedging

Banks may use interest rate swaps and other hedging instruments to manage selected exposures.

However, hedging arrangements must be carefully designed and monitored because they can introduce additional costs, basis risk and counterparty exposure.

Liquidity and Capital Planning

Adequate liquidity buffers and regulatory capital help banks withstand unexpected financial stress.

Stress testing can help management evaluate scenarios involving rapid interest rate increases, falling rates, deposit withdrawals, weaker economic growth and rising credit losses.

The objective is not simply to maximize profits in one particular interest rate environment.

It is to build a banking business capable of maintaining financial resilience throughout changing economic and monetary cycles.

13. Frequently Asked Questions

Do banks always benefit when central banks raise interest rates?

No. Higher rates may increase lending income, but they can also raise deposit costs, reduce loan demand, increase credit losses and create securities valuation risks. The overall effect depends on the bank's business model and balance-sheet structure.

Why can bank profits decline even when lending rates increase?

Bank profits may decline if funding expenses, credit-loss provisions, operating costs or investment losses increase faster than interest income.

What is the difference between net interest income and net interest margin?

Net interest income is the monetary difference between interest income and interest expense. Net interest margin expresses that income as a percentage of average interest-earning assets.

Are floating-rate loans better for banks during periods of rising interest rates?

Floating-rate loans may allow banks to increase lending yields more quickly. However, they also expose borrowers to higher repayment obligations, potentially increasing credit risk.

Can higher interest rates cause bank failures?

Higher rates alone do not necessarily cause bank failures. However, they can contribute to financial distress when combined with significant interest rate exposure, inadequate liquidity, concentrated deposits, weak risk management or deteriorating asset quality.

Do falling interest rates always reduce bank profitability?

No. Lower rates may narrow interest margins but can also support loan demand, improve borrower repayment capacity and increase the market value of certain fixed-rate investments.

Which matters more for bank profitability: interest rates or credit quality?

Both are important. Interest rates influence lending yields, funding expenses and securities valuations, while credit quality determines whether borrowers can meet repayment obligations. Their relative importance varies across banks and economic conditions.

Conclusion

Higher interest rates can create opportunities for commercial banks to increase lending income and improve net interest margins.

However, those benefits are neither automatic nor permanent.

Rising deposit costs can reduce interest spreads. Higher borrowing expenses can weaken loan demand and increase defaults. Fixed-income securities may lose market value, while liquidity and funding pressures can introduce additional risks.

The effects also vary across countries, banking systems and individual institutions.

For investors, banking professionals and policymakers, the essential lesson is that higher interest income should never be confused with stronger overall profitability.

A financially resilient bank is not simply one that earns more when interest rates rise.

It is an institution capable of managing funding costs, maintaining asset quality, controlling financial risks and generating sustainable returns across different monetary and economic conditions.

Ultimately, bank profitability depends less on the direction of interest rates alone and more on how effectively a bank manages the opportunities and risks that accompany changing financial conditions.