What Are the 4 Types of Interest Rate Risk?

Interest rate risk is a fact of life for financial institutions. Banks, credit unions, insurance companies, and non-bank lenders all share a version of the same structural challenge: the assets on one side of the balance sheet and the liabilities on the other side which rarely move in perfect sync when rates change.

For a typical depository institution, this is usually caused by a mismatch on the balance sheet and typically is caused by funding long-term fixed-rate loans with shorter-term deposits. An insurer, it might be caused by long-duration liabilities set against shorter-duration investments in their portfolio. For non-bank lenders, it can show up in a mortgage pipeline exposed to interest rate movements between the origination and the close. The mechanics differ, but the underlying exposure is the same: interest rate changes create winners and losers, and an institution that hasn’t measured its exposure won’t know which one it will be.

“Interest rate risk” is often treated as a single, monolithic risk. In practice, it breaks down into four distinct components – each with its own cause, its own warning signs, and its own approach to managing it.

What Is Repricing Risk?

Repricing risk comes from timing mismatches: the assets, liabilities, and off-balance-sheet instruments on your balance sheet don’t reprice on the same schedule. For fixed-rate instruments, you will generally see the mismatch at maturity, when a replacement instrument is needed to replace the maturing one and can only be found at whatever the current rate (price) the market is offering. For floating-rate instruments, it shows up at each repricing date.

A typical example is a long-term, fixed-rate loan funded by a short-term deposits or borrowings. As rates rise, the cost of funding increases well before the loan’s yield has any chance to catch up, and net interest margin narrows. This is the risk most people picture when they think about interest rate risk, and for good reason: it’s usually the largest single component of exposure for institutions with a traditional long-asset, short-liability profile.

What Is Basis Risk?

Basis risk occurs when instruments that are priced off different indices don’t move together, even though the indices are usually correlated. A loan tied to one benchmark and funded by a liability tied to a different one will experience some amount of “basis” drift as the two indices diverge, even if both move in the same general direction.

This is more important that it can originally seem. An institution can believe it has hedged a large portion of its rate exposure through matched maturities, only to discover that the indices underlying its assets and liabilities didn’t move together during a rate cycle. Reviewing historical correlation between the indices your institution relies on is a useful, if imperfect, starting point – historical correlation doesn’t guarantee future correlation, but it does inform reasonable expectations.

What Is Yield Curve Risk?

Yield curve risk results from non-parallel shifts in the yield curve. Markets don’t commonly move every point on the curve by the same amount. Short rates might rise faster than long rates (a flattening curve), or the reverse might happen (a steepening curve), and the shape of that shift changes the relationship between your institution’s funding costs and asset yields.

A flattening yield curve is particularly relevant for institutions that fund long-term assets with short-term liabilities: it’s the same repricing exposure discussed above but driven by a change in curve shape rather than a parallel shift in rates. Institutions that only stress-test for parallel rate shocks can miss this exposure entirely, which is why more robust interest rate risk frameworks – including the Basel Committee’s guidance on interest rate risk in the banking book – call for testing steepener and flattener scenarios specifically, not just an across-the-board shift up or down.

What Is Option Risk?

Option risk comes from the embedded options present in many financial instruments: callable bonds and notes, loans with prepayment rights, and on demand deposits that customers can withdraw at any time. Each of these gives the counterparty – the borrower, the depositor, the bondholder – the right to change the terms of the deal when it benefits them, which is usually exactly when it costs your institution the most.

A falling-rate environment is the classic trigger: borrowers refinance fixed-rate loans, shortening the effective duration of an asset your institution may have modeled as long-term. The reverse can happen with deposits in a rising-rate environment, as customers who might otherwise have kept funds in low-yielding accounts have more incentive to move them. Option risk is often the hardest of the four to measure, because it depends on customer behavior that doesn’t always follow a clean mathematical model.

Why the Distinction Between These Risks Matter for Financial Institutions

These four risks rarely show up in isolation, and a hedging strategy that only addresses one of them can still leave an institution exposed to the others. A gap analysis, for example, is useful for spotting repricing mismatches but won’t capture the effect of embedded options or non-parallel yield curve shifts. That’s part of why more sophisticated measurement tools – economic value of equity models, net interest income simulations, and multi-scenario stress testing – exist alongside simpler tools like gap analysis: each captures a different piece of the exposure.

The first step in managing any of these risks is recognizing which ones apply to your institution, and how much of each. That’s a measurement question before it’s a hedging question, and it’s usually where an outside perspective is most useful, since it’s easy for an institution’s own models to reflect assumptions that have gone untested for years.

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About HedgeStar

Founded in 2004, HedgeStar is a leading independent provider of outsourced valuation and hedge accounting services for financial instruments, including interest rate, currency, and commodity derivatives. Our team, comprised of valuation experts and certified public accountants (CPAs), delivers personalized services tailored to our clients, enhancing their risk, finance, and accounting functions. We are committed to our core values in every interaction.