SOFR
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 using US Treasury securities as collateral, making it a transaction-based rate rather than a survey-based estimate.
What It Means
SOFR replaced LIBOR because LIBOR was manipulated. The LIBOR scandal (2012-2013) revealed that major banks were submitting false rate estimates to benefit their trading positions — a practice that had gone on for years. Because LIBOR was embedded in an estimated $300+ trillion in financial contracts (mortgages, student loans, corporate debt, derivatives), 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 — approximately $1 trillion+ in daily repo market activity — rather than bank estimates of hypothetical borrowing costs.
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 | $1T+ daily Treasury repo transactions |
| Manipulation risk | High (demonstrated by scandal) | Low (based on observed trades) |
| Currency | USD, GBP, EUR, JPY, CHF versions | USD only (parallel rates in other currencies) |
| 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) | ~0.01% | 0-0.25% |
| 2021 (near-zero) | ~0.05% | 0-0.25% |
| March 2022 (rate hike start) | ~0.30% | 0.25-0.50% |
| 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% |
SOFR generally tracks the federal funds effective rate closely, with occasional spikes at quarter-end when repo demand surges.
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 |
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 now reference SOFR + spread (replacing 1-year LIBOR) |
| Student loans | Variable federal student loans reference SOFR |
| Corporate loans (syndicated) | Floating rate loans: Term SOFR + credit spread |
| Interest rate swaps | SOFR-based OIS (Overnight Index Swap) 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 1-month and 3-month synthetic LIBOR | September 2024 |
| Full LIBOR cessation | Late 2024 |
The transition required amending hundreds of millions of contracts — mortgages, credit cards, business loans, derivatives — that referenced LIBOR. Fallback language (what rate replaces LIBOR when it ceases) was a major legal and operational challenge.
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 | $1T+ | $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 |
Key Points to Remember
- SOFR replaced LIBOR — the manipulated benchmark that had underpinned ~$300T in global financial contracts
- SOFR is based on actual overnight Treasury repo transactions (~$1T daily), 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 by June 2023 — the most complex benchmark transition in financial history
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 — 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 (ARM) 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 (e.g., 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, secured or near-secured rates.
Related Terms
LIBOR
LIBOR was the world's most important benchmark interest rate — the rate at which major banks lent to each other — underpinning over $300 trillion in financial contracts before being replaced by SOFR and other alternatives following a massive manipulation scandal.
ARM
An adjustable-rate mortgage has an interest rate that changes periodically after an initial fixed-rate period — typically lower than fixed rates initially but subject to market fluctuations, making it suitable for borrowers who plan to sell or refinance before the adjustment period begins.
Basis Point
A basis point is one one-hundredth of a percentage point (0.01%) — the standard unit of measurement for interest rates, bond yields, and fee changes in finance, allowing precise communication about small rate movements without ambiguity.
HFT
High-frequency trading is an algorithmic trading strategy that executes thousands to millions of orders per second using powerful computers and co-location advantages — profiting from tiny price discrepancies and market microstructure inefficiencies at microsecond speed.
CDS
A credit default swap is a derivative contract that functions like insurance against a borrower defaulting on debt — the buyer pays periodic premiums and receives a payout if the reference entity defaults, allowing investors to hedge or speculate on credit risk.
Forward Curve
The forward curve shows the market's expectation of where a price or interest rate will be at future dates, derived from current market prices of futures and forward contracts.
Related Articles
Best High-Yield Savings Accounts for Teens in 2026
Most teen savings accounts pay almost nothing. High-yield savings accounts pay 10-50x more. Here's what to look for, which accounts actually work for teenagers, and how to open one today.
What Is a Tax Refund — And Is Getting One Actually Good?
A big tax refund feels like a win. But it means you overpaid the government all year and gave it an interest-free loan. Here is what a refund actually is and how to use your money better.
Financial Aid Explained: What High Schoolers Need to Know Before College
Most high schoolers apply to colleges without understanding how financial aid actually works. Here's the plain-English breakdown of FAFSA, grants, loans, and how to get the most money before you enroll.
Car Loans: How to Avoid Getting Ripped Off at the Dealership
Dealerships make more money on financing than on the car itself. Here is exactly how the process works, what the tricks are, and how to walk in prepared so you do not overpay.
The 10-Year Retirement Sprint: What to Do If You're Behind
Ten years is enough time to dramatically change your retirement picture — but only if you treat it like a sprint, not a stroll. Here's the exact playbook for the final decade before retirement.
