Rising interest rates affect bank profits in two directions at once: they widen the spread between what banks earn on loans and what they pay depositors, which lifts profits early, and they simultaneously push down bond values, raise funding costs, slow loan demand, and increase defaults, which drag profits later. Whether a given bank comes out ahead depends on how its balance sheet is positioned when the cycle begins. The industry-wide stakes are not small: FDIC-insured institutions were sitting on $482.4 billion in unrealized securities losses at the end of 2024, and three major banks failed in 2023 after misjudging exactly these risks.
Why Profits Rise First
The gap between what borrowers pay a bank and what the bank pays depositors is called the net interest margin, and it is the single most important line on a bank’s income statement. When the Federal Reserve raises its target rate, banks holding floating-rate loans see revenue jump almost immediately. A commercial loan tied to the Secured Overnight Financing Rate1Federal Reserve Bank of New York. Secured Overnight Financing Rate generates more income the moment SOFR ticks higher, without the bank doing anything.
Deposit costs, by contrast, lag. Early in a hiking cycle, banks can keep savings account rates low while collecting more on every adjustable-rate asset. The portion of a rate increase a bank actually passes through to depositors is called a deposit beta, a number between zero and one. A beta near zero means the bank keeps almost the entire increase. A beta near one means depositors capture it. Early-cycle betas tend to sit well below one, and that is where the initial margin expansion comes from.
Not every bank captures this gain. An institution loaded with long-term fixed-rate mortgages locked in at three or four percent is stuck earning yesterday’s rates while its funding costs climb. The balance between rate-sensitive assets and rate-sensitive liabilities determines whether a bank benefits or suffers, and the banks that got that balance wrong in 2022 and 2023 paid heavily for it.
When the Margin Boost Fades
The early-cycle windfall has a shelf life. As rates stay high, depositors notice they can earn far more in money market funds and Treasury bills than in a standard savings account. When the gap gets wide enough, money leaves. That outflow forces banks to replace cheap deposits with expensive alternatives like certificates of deposit and high-yield savings products.
Corporate treasurers and institutional investors move first. They watch rate differentials constantly and will shift large balances for a fraction of a percent. Banks that rely heavily on large uninsured deposits are the most exposed, because those depositors have no insurance incentive to stay put. A Federal Reserve Bank of St. Louis analysis described the trap plainly: a bank without enough room in its interest margin to pay up for deposits often loses them, which restricts new lending and squeezes margins further, which eventually erodes capital.
The options narrow further for weaker banks. Under Section 29 of the Federal Deposit Insurance Act, banks that fall below “well capitalized” status face restrictions on accepting brokered deposits and cannot offer deposit rates significantly above the prevailing market, which cuts off two of the main tools a struggling bank would otherwise reach for.
Bond Portfolios Lose Value
Banks hold large portfolios of government and corporate bonds for liquidity and steady income. Bond prices move opposite to rates: when rates rise, existing bonds paying lower coupons become less attractive and their market value drops. For a long-maturity bond, even a one-percentage-point rate increase can knock roughly five percent off the price.
How those losses show up on the books depends on classification. Under FASB Accounting Standards Codification Topic 320, bonds labeled “available-for-sale” are marked to current market value each reporting period. The loss flows into accumulated other comprehensive income in the equity section of the balance sheet. The bank has not actually sold anything, but reported equity still shrinks.
Bonds classified as “held-to-maturity” are different. They stay on the books at original cost no matter what the market would pay today. That shields reported capital ratios from price swings, but the bank is locked into below-market returns while newer securities offer better yields. And if the bank ever has to sell held-to-maturity securities to raise cash, the hidden losses become real.
By the fourth quarter of 2024, unrealized losses on securities held by FDIC-insured banks reached $482.4 billion, a 32.5 percent increase from the prior quarter. Most banks outside the largest tier had been allowed to make a one-time election excluding unrealized gains and losses on available-for-sale securities from their regulatory capital calculations, which kept capital ratios looking healthy on paper even as portfolios lost value. Federal banking agencies have proposed eliminating that opt-out for institutions with $100 billion or more in total assets, which would force those banks to reflect unrealized securities losses directly in their common equity tier 1 capital. Community banks would not be affected.
The danger of ignoring these losses was made plain in March 2023. Silicon Valley Bank had bought large quantities of long-dated bonds when rates were near zero in 2020 and 2021. As rates rose, those holdings lost roughly $17 billion in market value. When SVB announced it had sold $24 billion in securities at a $1.8 billion realized loss, depositors pulled $42 billion in a single day. SVB failed the next morning. Signature Bank and First Republic followed within weeks. The three failed institutions together held more assets than all the banks lost during the 2008 financial crisis.
Fee Income Shrinks
Loan interest is not a bank’s only revenue source. Fees from mortgage originations, investment banking, and wealth management make up a meaningful slice of total revenue, and much of that income shrinks when rates rise. Mortgage refinancing volumes collapse because nobody refinances into a higher rate. Purchase mortgage volume falls as buyers get priced out. Investment banking fees drop as deal activity slows and bond issuance declines. Research from the Federal Reserve Bank of Minneapolis found that non-interest income generally falls when rates increase, partially offsetting the gains from wider lending margins.
The efficiency ratio captures this. It divides non-interest operating costs by total revenue. When fee income drops but overhead stays roughly flat, the ratio climbs, which signals the bank is spending more to generate each dollar of revenue. Community banks feel this acutely because they lack the scale to spread fixed costs across a large revenue base. A bank that looks healthy on net interest margin alone can still be losing ground if fee income is falling faster than the margin is widening.
Fewer New Loans, More Bad Ones
Higher rates make borrowing more expensive, which reduces demand. In the mortgage market, a two-percentage-point rate increase on a $400,000 loan can add roughly $500 or more to the monthly payment, pushing many buyers out entirely. Consumers also pull back on auto loans, home equity lines, and credit cards. Corporate borrowers run the same math. An expansion project that penciled out at a four percent cost of capital may not work at seven percent, so businesses draw less on revolving credit and delay capital spending. The bank earns a higher rate on the loans it does close, but fewer loans means volume losses can swamp the per-loan gain.
The borrowers who do stay in the market face more default risk, and that risk concentrates most dangerously in commercial real estate. Many commercial property loans have five- or ten-year terms that come due for refinancing regardless of where rates stand. A building owner who financed at three percent in 2020 and needs to refinance at seven percent in 2025 faces a payment shock that rental income may not support. If the borrower cannot refinance or sell, the loan goes delinquent.
Banks must set aside reserves to absorb those expected losses. Under the current expected credit losses standard, known as CECL and codified as ASC Topic 326, banks estimate potential losses over the entire remaining life of each loan, not just losses they believe are imminent. When high rates darken the economic outlook, lifetime loss estimates rise, and the bank must book larger charges against current earnings. Reserves set aside cannot be lent out or returned to shareholders, which creates a direct drag on both growth and profitability.
How Banks Try to Stay Ahead of the Risk
Most banks run a formal oversight process through an asset-liability committee that meets at least quarterly to evaluate rate exposure. The committee models what would happen to earnings and capital under various scenarios, including sharp upward rate moves, and sets limits on how much interest rate risk the bank can carry.
The main measurement tools are gap analysis and duration modeling. A gap report compares rate-sensitive assets against rate-sensitive liabilities across time buckets to show where mismatches sit. Duration analysis estimates how much the value of the balance sheet would change for a given rate move. A bank with a large positive duration gap stands to lose significant value if rates rise quickly.
One finding from research published by the CFTC runs against intuition: most banks do not rely heavily on interest rate swaps to hedge their overall exposure. The average bank’s net swap position is economically tiny relative to the rate risk embedded in its loan and securities portfolios. Instead, banks lean on the deposit base itself as a natural hedge, because deposit rates adjust slowly and incompletely when market rates move, providing a cushion of below-market funding on the liability side.
For the largest banks, the Federal Reserve’s annual stress tests supply an external check. The tests estimate how losses, revenues, and capital would hold up under hypothetical recession scenarios, and the results feed directly into capital requirements. A bank that fails may be barred from paying dividends or buying back stock until it strengthens its capital position.