--- title: "SOFR-OIS Spread: Formula, Meaning" description: "The difference between a SOFR-based rate and an overnight index swap rate of matching term. The exact pairing varies by source, but it is commonly used as a..." canonical: https://www.getswoopr.com/indicators/fixed-income-and-credit/sofr-ois-spread/ source: "Swoopr Investment: https://www.getswoopr.com" --- ## Direct Answer > The difference between a SOFR-based rate and an overnight index swap rate of matching term. The exact pairing varies by source, but it is commonly used as a gauge of funding-market conditions after the shift away from LIBOR. A widening spread can indicate funding pressure or heavy demand for cash, while a narrow spread indicates smooth markets. # SOFR-OIS Spread: Formula, Meaning, Signals, Examples and How to Use It ## How Is SOFR-OIS Spread Calculated? The difference between a SOFR-based rate and an overnight index swap rate of matching term. The exact pairing varies by source, but it is commonly used as a gauge of funding-market conditions after the shift away from LIBOR. **Formula:** `SOFR-OIS spread (bp) = (SOFR-based rate - OIS rate of the same term) x 100, with rates in percent` **Inputs:** - SOFR-based rate (for example term SOFR or a SOFR swap) - OIS rate of the same tenor - Same observation date **Worked example.** A SOFR-based rate of 4.38% and an OIS rate of 4.33% for the same term give a spread of 5 basis points. The inputs are illustrative numbers, not market data. **Reading it.** A widening spread can indicate funding pressure or heavy demand for cash, while a narrow spread indicates smooth markets. It is read relative to its own recent range. **Limits.** Because both legs are close to risk-free, the spread is usually small and sensitive to the specific rates paired. Month-end and tax-date funding effects can move it for reasons unrelated to credit stress. ## What is SOFR-OIS Spread? The difference between a SOFR-based rate and an overnight index swap rate of matching term. The exact pairing varies by source, but it is commonly used as a gauge of funding-market conditions after the shift away from LIBOR. ## How to use SOFR-OIS Spread A widening spread can indicate funding pressure or heavy demand for cash, while a narrow spread indicates smooth markets. It is read relative to its own recent range. A reading alone is never a buy or sell signal; it needs context from price structure, volume, volatility and the broader market regime. ## Strengths - With both legs referencing overnight secured rates, the gap focuses on funding-market and technical effects rather than bank credit risk. - SOFR is a transaction-based rate from the repo market, so that leg is backed by observed trades rather than quoted estimates. - Reproducible when the formula and data convention are fixed. ## Weaknesses and limitations - Whether the SOFR leg is the overnight fixing, a compounded average or a term rate changes what the gap includes, so series are not interchangeable. - OIS pricing responds to expected changes at central bank meetings, so a spread across a meeting date mixes funding conditions with policy expectations. - 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 SOFR-OIS Spread a buy or sell signal? No. A widening spread can indicate funding pressure or heavy demand for cash, while a narrow spread indicates smooth markets. Because both legs are close to risk-free, the spread is usually small and sensitive to the specific rates paired. 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 SOFR-OIS Spread? SOFR-OIS Spread is computed from SOFR-based rate (for example term SOFR or a SOFR swap); OIS rate of the same tenor; same observation 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 SOFR-OIS Spread be used by itself? Because both legs are close to risk-free, the spread is usually small and sensitive to the specific rates paired. Month-end and tax-date funding effects can move it for reasons unrelated to credit stress. For that reason it is read next to measures of direction, participation, valuation, liquidity and risk, not alone. Does SOFR-OIS Spread work on every timeframe? The calculation (SOFR-OIS spread (bp) = (SOFR-based rate - OIS rate of the same term) 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 SOFR-OIS Spread give false signals? Whether the SOFR leg is the overnight fixing, a compounded average or a term rate changes what the gap includes, so series are not interchangeable. OIS pricing responds to expected changes at central bank meetings, so a spread across a meeting date mixes funding conditions with policy expectations. Lag, noise and regime changes add to this, because market participants react to new information after the reading is calculated. How should SOFR-OIS Spread be backtested? Rebuild SOFR-OIS Spread from SOFR-based rate (for example term SOFR or a SOFR swap) 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. 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