Key Takeaways:
The Federal Reserve raised its benchmark rate by a quarter point to a 3.75%-4% range on Sept. 16, its first increase since July 2023, setting off a repricing of bank earning assets that will be partly offset by what lenders must pay depositors.
The FOMC vote was unanimous. "Inflation remains elevated," the committee said in its statement. "Today's policy action will support a timelier return to the committee's 2% goal."
For JPMorgan Chase, Bank of America, Citigroup, Wells Fargo and KeyCorp, the arithmetic runs in two directions at once. Loans and securities reprice upward within weeks; deposits reprice on a lag that has shortened sharply since 2022. The gap between those two speeds is the whole story for bank earnings over the next four quarters.
The asset side reprices first
A 25 basis point increase in the policy rate lifts the yield on floating-rate loans, new originations and cash balances almost immediately. Roughly half of a typical large bank's loan book is floating-rate or short-duration, so the first-order benefit shows up in net interest income within one to two quarters.
The scale is not trivial. At a bank with $2.5 trillion in interest-earning assets, a 25bp move on even 40% of that base is worth about $2.5 billion in annualized revenue before funding costs. JPMorgan, the largest of the group by assets, carries the biggest absolute exposure; KeyCorp, with a far smaller balance sheet, carries the biggest relative one because commercial and industrial lending dominates its mix.
Loan growth is the second variable. The Fed described "economic activity expanding at a solid pace" with "resilient" domestic spending, which supports credit demand. But higher rates also raise the hurdle for borrowers, and the same statement flagged "elevated" uncertainty tied to geopolitical developments.
Deposit costs are the offset
The liability side is where the 2022-2023 experience still bites. Deposit betas — the share of a rate move passed through to depositors — climbed above 50% at several large banks during the last tightening cycle, far above the 20-30% assumed in pre-pandemic models. Customers now move idle cash into money market funds and Treasuries within days, not quarters.
That means the marginal benefit of each hike is smaller than the headline suggests. If a bank earns an extra 25bp on assets but pays an extra 15bp on funding, the net spread gain is 10bp, not 25bp. Deposit competition compounds it: regional lenders that lost funding in 2023 are still paying up to hold balances, and KeyCorp sits squarely in that group.
Provisioning is the third leg. Higher rates pressure borrowers with floating-rate debt, and credit costs typically lag a tightening cycle by four to six quarters. None of the five banks has updated loss guidance for the September move.
What the market is pricing
Bank shares have traded on the expectation of a steeper curve rather than the level of the policy rate. The Fed's own statement acknowledged the tension: it raised rates while noting that "productivity growth is strong, and capital investment is robust," a combination that argues against aggressive further tightening.
The last comparable setup was July 2023, when the Fed lifted the funds rate to 5.25%-5.5%. Bank net interest income peaked within two quarters of that move and then declined for five straight quarters as deposit costs caught up. Whether this cycle repeats that pattern depends on how fast depositors respond — and on whether the Fed stops here.
Fed Chair Kevin Warsh gave no forward guidance on the path. Economists at the University of Michigan's Research Seminar in Quantitative Economics expect further increases, calling September the start of a policy realignment rather than a one-time action. The FOMC next meets in late October.
For the five banks, the practical question is deposit beta, not the policy rate. A 40% beta leaves the sector with a genuine earnings upgrade. A 60% beta turns the hike into a rounding error against rising funding costs — and the third-quarter earnings calls, beginning in mid-October, are where that number gets disclosed.
This article is for informational purposes only and does not constitute investment advice.
