Interest Rate Pass-Through

When a central bank raises its policy rate, how fast do mortgage rates, credit card rates, and savings account yields move in response? Interest rate pass-through measures the speed and completeness of that translation — a critical link in whether monetary policy actually reaches borrowers, savers, and the real economy.

Why banks don’t move at the policy rate

Central banks don’t directly set retail loan or deposit rates — commercial banks do. When the Federal Reserve raises the federal funds target range, it creates a floor and ceiling for overnight interbank lending, but borrowers expecting their mortgage rate to snap up the same day will wait a long time. Banks must first absorb the policy signal, recalculate their own funding costs, assess loan demand, and adjust pricing to defend their net interest margin. If all three of those forces align — and banks face fierce competition — pass-through can be near-complete within weeks. If not, delays stretch to months and elasticity falls short of one.

The deposit-rate lag

Deposit rates almost always lag policy rate increases. Banks have little incentive to pay savers more if they can avoid it; savers cannot easily shop around and switching costs are high. When the Fed raises rates, banks first hoard the higher margins on floating-rate loans and wholesale borrowing. Only when deposit flight accelerates — or when competitors begin offering higher yields to stem outflows — do retail deposit rates budge upward. This asymmetry has led to complaints from consumer advocates and calls for regulatory action. Studies suggest deposit-rate elasticity typically ranges from 0.3 to 0.7 in the initial quarters, sometimes approaching unity only after many months.

Loan-rate transmission: faster but incomplete

Mortgage rates and prime-based loan rates tend to pass through policy changes more quickly, especially for adjustable-rate products. Mortgage-backed securities trade in deep wholesale markets with real-time price discovery, and banks cannot ignore secondary-market yields without losing origination volume. Floating-rate business loans often include explicit spreads over SOFR or another reference rate, mechanically capturing changes within days. Yet even fixed-rate mortgages do not move one-for-one immediately, because banks control the supply of mortgage origination and can ration credit or tighten underwriting during periods of rate uncertainty.

How bank market power shapes outcomes

In concentrated banking markets, pass-through tends to be slower and more incomplete, especially on the deposit side. Large banks with established customer bases can raise loan rates without losing many borrowers; small depositors have few alternatives in rural areas or for certain account types. Conversely, markets with vigorous competition — whether from regional banks, credit unions, or fintech lenders — force faster price adjustment because a competitor will capture share if spreads remain too wide. During periods of banking stress or negative equity capital buffers, banks may slow pass-through to preserve profitability, even at the cost of intermediation.

Empirical patterns and time variation

Researchers have documented that pass-through is neither constant nor universal. In the United States, loan-rate elasticity in recent decades has hovered near 0.8–1.0 over a six-month horizon, though substantial heterogeneity exists by loan type and bank size. Deposit rates have shown elasticity of 0.4–0.6, with a slower lag. International comparisons reveal wide variation: euro-area pass-through has historically been weaker than in the UK, partly owing to structural differences in banking competition and securities markets. Crucially, asymmetry across the rate cycle is documented — banks may pass through increases slowly but pass through cuts quickly (or not at all), a pattern harmful to monetary transmission during downturns.

Policy implications and transmission channels

If pass-through is incomplete, central banks must raise the policy rate further to achieve the same real tightening in loan conditions — a costly detour that may overshoot and trigger unnecessary job losses. If deposit rates lag persistently, banks accumulate windfall profits at the expense of savers, distorting incentives for financial saving and reducing household wealth. Some central banks have experimented with negative policy rates or explicit forwards guidance to shape expectations and accelerate transmission. The Dodd-Frank Act and subsequent regulations have nudged transparency in loan pricing, potentially aiding pass-through by making rate schedules more visible to borrowers.

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