SOFR (Secured Overnight Financing Rate)
Quick Definition
SOFR (Secured Overnight Financing Rate) is the benchmark interest rate for US dollar-denominated financial contracts, replacing the scandal-plagued LIBOR (London Interbank Offered Rate). Published daily by the Federal Reserve Bank of New York, SOFR is based on actual overnight repurchase agreement (repo) transactions backed by US Treasury securities. As of July 2026, SOFR trades near 3.60% with approximately $3 trillion in daily transaction volume backing it.
What It Means
If you have an adjustable-rate mortgage, a business loan, or an interest rate swap, the rate you pay probably resets periodically based on SOFR. This benchmark determines how much interest millions of borrowers and lenders exchange every day.
SOFR replaced LIBOR because LIBOR was manipulated. The LIBOR scandal (2012-2013) revealed that major banks submitted false rate estimates to benefit their trading positions, a practice that went on for years. LIBOR was embedded in an estimated $300 trillion in financial contracts including mortgages, student loans, corporate debt, and swaps. Finding a credible replacement was one of the most complex financial transitions in history.
SOFR is more reliable because it is based on actual transactions, roughly $3 trillion in daily repo market activity, rather than bank estimates of hypothetical borrowing costs. No panel of bankers decides what the rate should be. The rate is computed from real trades that actually happened.
LIBOR vs. SOFR: Key Differences
| Feature | LIBOR | SOFR |
|---|---|---|
| Basis | Survey: banks estimate their borrowing cost | Transaction-based: actual overnight repo trades |
| Collateral | Unsecured (no collateral) | Secured (Treasury collateral) |
| Tenors | Overnight, 1-week, 1-, 2-, 3-, 6-, 12-month | Primarily overnight; term SOFR available |
| Daily volume backing | Survey with limited actual trades | ~$3T daily Treasury repo transactions |
| Manipulation risk | High (demonstrated by scandal) | Low (based on observed trades) |
| Credit risk component | Yes (unsecured; included bank credit risk) | No (secured; effectively risk-free) |
| Phase-out | Most USD LIBOR ended June 30, 2023 | Now the primary USD benchmark |
SOFR Rate History
SOFR is an overnight rate that closely tracks the federal funds rate:
| Date | SOFR | Fed Funds Target |
|---|---|---|
| 2019 (pre-COVID) | ~2.3% | 2.25-2.50% |
| March 2020 (COVID crash) | ~0.01% | 0-0.25% |
| 2021 (near-zero) | ~0.05% | 0-0.25% |
| End of 2022 | ~4.30% | 4.25-4.50% |
| Mid 2023 (peak) | ~5.30% | 5.25-5.50% |
| Early 2024 | ~5.30% | 5.25-5.50% |
| Mid 2025 | ~4.28% | 4.25-4.50% |
| July 2026 | ~3.60% | 3.50-3.75% |
SOFR generally tracks the federal funds effective rate closely, with occasional spikes at quarter-end when repo demand surges. The Fed has cut rates from the 5.25-5.50% peak as inflation cooled through 2024 and 2025, bringing SOFR down to the 3.50-3.65% range by mid-2026.
Types of SOFR
| SOFR Type | Description | Use Case |
|---|---|---|
| Daily SOFR | Published each business day; reflects prior day's overnight repo | Daily-resetting floating rates |
| SOFR Averages (30/90/180-day) | Compounded averages; smooths daily volatility | Loan rates; more stable floating reference |
| Term SOFR | Forward-looking rates (1-, 3-, 6-month) based on SOFR futures | Replaces term LIBOR in loans; most bank-friendly |
| SOFR-based swaps | Most liquid fixed-for-floating swaps now reference SOFR | Derivatives market |
As of July 2026, the 30-day SOFR average sits near 3.62%, the 90-day average near 3.63%, and the 180-day average near 3.66%. Term SOFR (published by CME Group) is particularly important for the loan market. Lenders and borrowers prefer a forward-looking rate like 3-month SOFR over daily compounded rates for operational simplicity in calculating loan payments.
SOFR in Financial Contracts
| Contract Type | How SOFR Is Used |
|---|---|
| Adjustable-rate mortgages | Many ARMs reference SOFR plus a spread (replacing 1-year LIBOR) |
| Student loans | Variable federal student loans reference SOFR |
| Corporate loans (syndicated) | Floating rate loans: Term SOFR plus credit spread |
| Interest rate swaps | SOFR-based OIS (Overnight Index Swap) is the most liquid |
| FRNs (floating rate notes) | Bonds with rates resetting to SOFR periodically |
| SOFR futures (CME) | Used to hedge or speculate on future SOFR levels |
The LIBOR to SOFR Transition
| Milestone | Date |
|---|---|
| LIBOR manipulation scandal revealed | 2012-2013 |
| Alternative Reference Rates Committee (ARRC) formed | 2014 |
| SOFR first published | April 2018 |
| New USD LIBOR contracts prohibited (US) | January 2022 |
| Most USD LIBOR tenors ceased | June 30, 2023 |
| Remaining synthetic LIBOR ceased | Late 2024 |
| Full LIBOR transition complete | 2024 |
The transition required amending hundreds of millions of contracts, including mortgages, credit cards, business loans, and derivatives, that referenced LIBOR. Fallback language (what rate replaces LIBOR when it ceases) was a major legal and operational challenge. The Alternative Reference Rates Committee (ARRC) coordinated the transition across the financial industry.
SOFR vs. Federal Funds Rate
SOFR and the federal funds rate are closely related but distinct:
| Feature | SOFR | Federal Funds Rate |
|---|---|---|
| What it measures | Overnight cost of cash secured by Treasuries | Overnight cost of unsecured interbank lending |
| Collateral | Treasury securities | None |
| Daily volume | ~$3T | $80-100B |
| Controlled by | Market transactions | Federal Reserve target |
| Risk premium | None (risk-free secured) | Small bank credit premium |
| Relationship | Closely tracks Fed Funds | Set by FOMC at meetings |
The Federal Reserve Bank of New York publishes SOFR daily based on actual repo market data. The federal funds rate, by contrast, is a target set by the FOMC. SOFR typically trades within a few basis points of the fed funds rate because both reflect overnight dollar borrowing costs, though SOFR is secured while fed funds is not.
Common Mistakes to Avoid
- Assuming SOFR and LIBOR behave identically: LIBOR included a bank credit risk premium that SOFR does not. During financial stress, LIBOR would spike as bank credit deteriorated. SOFR, being secured by Treasuries, stays stable. This means loans referencing SOFR may not react to banking stress the way old LIBOR loans did.
- Ignoring the term structure: Daily SOFR is an overnight rate. If your loan references "SOFR" without specifying a term, you may be getting a daily-resetting rate that creates payment uncertainty. Term SOFR (1-month, 3-month) provides more predictable payment schedules.
- Forgetting about the spread adjustment: When LIBOR contracts transitioned to SOFR, a spread adjustment was added because SOFR is lower than LIBOR (no credit risk component). Borrowers who did not understand this adjustment were surprised when their rate calculation changed.
Key Points to Remember
- SOFR replaced LIBOR, the manipulated benchmark that had underpinned approximately $300 trillion in global financial contracts
- SOFR is based on actual overnight Treasury repo transactions (~$3T daily as of 2026), not survey estimates
- Published daily by the Federal Reserve Bank of New York
- Term SOFR (1-, 3-, 6-month) is the most practical form for commercial loans and mortgages
- SOFR is a risk-free secured rate: it does not include bank credit risk (unlike LIBOR)
- The LIBOR-to-SOFR transition was completed in 2024, making it the most complex benchmark transition in financial history
- As of July 2026, SOFR trades near 3.60% with the Fed funds target at 3.50-3.75%
Related Concepts
- Interest Rate: The broader concept of borrowing costs that SOFR measures
- Federal Funds Rate: The Fed's target rate that SOFR closely tracks
- Basis Point: The unit used for rate changes and spreads
- Bond: Fixed-income securities whose pricing depends on benchmark rates like SOFR
- Treasury Yield: The returns on government debt that underpin SOFR's collateral
- Swaps: Derivatives contracts that now predominantly reference SOFR
Frequently Asked Questions
Q: Why does SOFR not include a credit risk premium like LIBOR did? A: SOFR is a secured rate. The overnight repo transactions backing it are collateralized by US Treasury securities. If a counterparty defaults, the lender can sell the Treasuries to recover the loan. LIBOR was unsecured, meaning bank-to-bank lending with no collateral, so it included a bank credit risk premium that varied with market stress. During the 2008 crisis, LIBOR spiked significantly above SOFR equivalents precisely because of this bank credit risk component.
Q: How does a SOFR-based mortgage work? A: For an adjustable-rate mortgage tied to SOFR, the rate resets periodically (typically annually after an initial fixed period) to a predetermined SOFR tenor (often 1-year SOFR) plus a margin (for example, SOFR + 2.75%). As SOFR changes with Fed policy, the mortgage payment adjusts accordingly. Borrowers get lower initial rates compared to 30-year fixed but accept the risk that rates could rise.
Q: What replaced LIBOR in British pounds and euros? A: SONIA (Sterling Overnight Index Average) replaced GBP LIBOR for British pound contracts. ESTR (Euro Short-Term Rate) replaced EURIBOR for euro contracts. Each major currency jurisdiction developed its own LIBOR replacement based on similar principles: overnight, transaction-based, and secured or near-secured rates.
Q: Where can I find today's SOFR rate? A: The Federal Reserve Bank of New York publishes SOFR every business day by 8:00 AM ET on its website. The New York Fed's reference rates page provides the daily rate, percentiles, and transaction volumes. FRED (Federal Reserve Economic Data) also maintains a SOFR series for historical data.
