--- title: "LIBOR-OIS Spread: Formula, Meaning" description: "The difference between 3-month LIBOR and the matching-term overnight index swap (OIS) rate. It was a gauge of bank funding stress, because LIBOR embedded..." canonical: https://www.getswoopr.com/indicators/fixed-income-and-credit/libor-ois-spread/ source: "Swoopr Investment: https://www.getswoopr.com" --- ## Direct Answer > The difference between 3-month LIBOR and the matching-term overnight index swap (OIS) rate. It was a gauge of bank funding stress, because LIBOR embedded bank credit and liquidity risk while OIS reflected expected policy rates. LIBOR has been discontinued, so the series is historical. # LIBOR-OIS Spread: Formula, Meaning, Signals, Examples and How to Use It ## How Is LIBOR-OIS Spread Calculated? The difference between 3-month LIBOR and the matching-term overnight index swap (OIS) rate. It was a gauge of bank funding stress, because LIBOR embedded bank credit and liquidity risk while OIS reflected expected policy rates. LIBOR has been discontinued, so the series is historical. **Formula:** `LIBOR-OIS spread (bp) = (3-month LIBOR - 3-month OIS rate) x 100, with rates in percent` **Inputs:** - 3-month LIBOR fixing (percent) - 3-month OIS rate (percent) - Same date **Worked example.** A 3-month LIBOR of 2.10% and a 3-month OIS rate of 1.65% give a LIBOR-OIS spread of 45 basis points. The inputs are illustrative numbers, not market data. **Reading it.** A wider spread signaled greater concern about bank credit risk and funding availability, while a narrow spread signaled calm interbank markets. **Limits.** LIBOR has been replaced by risk-free rates such as SOFR, so the measure no longer updates and successor spreads are not identical in meaning. LIBOR was also based on panel submissions rather than only on actual trades. ## What is LIBOR-OIS Spread? The difference between 3-month LIBOR and the matching-term overnight index swap (OIS) rate. It was a gauge of bank funding stress, because LIBOR embedded bank credit and liquidity risk while OIS reflected expected policy rates. LIBOR has been discontinued, so the series is historical. ## How to use LIBOR-OIS Spread A wider spread signaled greater concern about bank credit risk and funding availability, while a narrow spread signaled calm interbank markets. A reading alone is never a buy or sell signal; it needs context from price structure, volume, volatility and the broader market regime. ## Strengths - Matching terms removes expected policy-rate drift, so the gap isolates the credit and liquidity premium in unsecured interbank borrowing. - Both legs are quoted for the same 3-month term, which makes the difference a clean like-for-like spread in basis points. - Reproducible when the formula and data convention are fixed. ## Weaknesses and limitations - It captured unsecured bank funding risk only, so strain in secured repo or Treasury funding markets could pass without a signal. - The OIS leg is a swap rate with its own collateral and counterparty terms, so the gap blends bank risk with swap market conditions. - Correlated indicators can create false confidence by repeating the same underlying information. ## Editorial and risk note This page is educational content, not individualized investment advice. It should not imply guaranteed prediction, accuracy or outperformance. ## Frequently Asked Questions Is LIBOR-OIS Spread a buy or sell signal? No. A wider spread signaled greater concern about bank credit risk and funding availability, while a narrow spread signaled calm interbank markets. LIBOR has been replaced by risk-free rates such as SOFR, so the measure no longer updates and successor spreads are not identical in meaning. A trade built on it still needs a trigger, an invalidation rule, a position size and realistic execution assumptions. What is the best setting for LIBOR-OIS Spread? LIBOR-OIS Spread is computed from 3-month LIBOR fixing (percent); 3-month OIS rate (percent); same date, so the choices that matter are the data convention and the window it is read over. Test those across instruments, regimes and out-of-sample periods instead of fitting one historical winner. Can LIBOR-OIS Spread be used by itself? LIBOR has been replaced by risk-free rates such as SOFR, so the measure no longer updates and successor spreads are not identical in meaning. LIBOR was also based on panel submissions rather than only on actual trades. For that reason it is read next to measures of direction, participation, valuation, liquidity and risk, not alone. Does LIBOR-OIS Spread work on every timeframe? The calculation (LIBOR-OIS spread (bp) = (3-month LIBOR - 3-month OIS rate) x 100, with rates in percent) can be run on any bar size, but behavior is not portable: a reading on a five-minute chart describes a very different market window from the same reading on a daily chart. Validate the exact timeframe before relying on it. Why does LIBOR-OIS Spread give false signals? It captured unsecured bank funding risk only, so strain in secured repo or Treasury funding markets could pass without a signal. The OIS leg is a swap rate with its own collateral and counterparty terms, so the gap blends bank risk with swap market conditions. Lag, noise and regime changes add to this, because market participants react to new information after the reading is calculated. How should LIBOR-OIS Spread be backtested? Rebuild LIBOR-OIS Spread from 3-month LIBOR fixing (percent) using point-in-time data, write the rules before testing, include delisted securities where relevant, model realistic fills and costs, reserve a validation sample and compare with a simpler baseline. ## References - [Federal Reserve Bank of New York: Secured Overnight Financing Rate Data](https://www.newyorkfed.org/markets/reference-rates/sofr) S Swoopr Editorial Team The Swoopr Editorial Team produces independent investment education, research, and tools for understanding markets, evaluating opportunities, and managing risk. All content is educational only and does not constitute personalized investment advice. 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