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The Secured Overnight Financing Rate (SOFR) is a key benchmark interest rate in US financial markets that reflects the cost of borrowing cash overnight against US Treasury securities. It replaced LIBOR as the primary reference rate for dollar-denominated loans, bonds, derivatives, and cross-border financial contracts globally.
Understanding how SOFR is calculated and how it changes can help borrowers, investors, and businesses assess interest-rate movements and their impact on financing costs.
This article explains how SOFR is measured, why LIBOR was retired, how it affects Indian dollar borrowings, and how it compares with India's domestic money market benchmarks.
Key Takeaways
- SOFR measures the actual cost of borrowing cash overnight using US Treasury securities as collateral, derived from roughly a trillion dollars of daily repo trades.
- Its manipulation risk is exceptionally low compared to LIBOR because it relies on verifiable transaction data rather than voluntary panel submissions.
- Markets price loans and swaps running for months or years using compounded or forward-looking versions of SOFR rather than the raw overnight print.
- Movements in SOFR directly alter the rupee servicing costs of Indian corporate External Commercial Borrowings (ECBs), independent of RBI policy decisions.
- India operates a parallel secured market in rupees through TREPS, making domestic and US money market benchmarks complementary rather than competitive.
What is SOFR?
The Secured Overnight Financing Rate (SOFR) is the benchmark used to measure how much it costs to borrow US dollars overnight. To get cash for a single day, financial institutions pledge high-quality US Treasury bonds as collateral, making these loans extremely low-risk.
Every business morning, the Federal Reserve Bank of New York calculates and publishes this rate.
Old benchmarks like LIBOR were based on educated guesses from banks about what they thought borrowing should cost. SOFR, on the other hand, is built on cold, hard data. It tracks actual, real-world trades in the US Treasury repurchase (repo) market, a massive market that handles roughly $1 trillion in transactions every single day.
Because it's tied to real money changing hands, it's virtually impossible to manipulate and gives a crystal-clear picture of short-term borrowing costs worldwide.
From Repo Trades to a Daily Benchmark
When financial institutions need short-term cash, they frequently use a repo transaction: selling government securities today and repurchasing them the next business day at a slightly higher price. That price gap represents the interest paid.
The Federal Reserve Bank of New York computes SOFR daily by aggregating transaction data across three repo market segments: tri-party repo cleared through custodian banks, General Collateral Finance (GCF) repo, and centrally cleared bilateral repo.
It calculates the volume-weighted median rate and publishes it around 8:00 AM Eastern Time. For instance, the published rate on 27 August 2026 was 3.64%, underpinned by daily repo turnover of about USD 1 trillion.
Example
Cash borrowed: $10,000,000
Collateral pledged: US Treasury securities worth $10,500,000
Agreed overnight rate: 3.64% per year
Interest for one day: ($10,000,000 × 3.64%) / 360 = $1,011.11
Settlement: Borrower repays $10,001,011.11 the next morning and reclaims the bonds.
Note: US money markets calculate interest on a 360-day year, whereas Indian rupee markets conventionally use 365 days. Cross-border finance teams must adjust for this day-count difference when comparing funding costs.
Read More: What is Repo Rate
One Overnight Rate, Many Contract Lengths
Because business loans and derivatives run for extended periods, market participants adapt the overnight print through three primary methodologies:
| Method | How it Works | Typical Use |
| Daily Simple SOFR | Applies a single day's rate straight to a balance. | Short-dated cash lines |
| Compounded SOFR in arrears | Compounds daily prints across the full interest period, known at the end. | Corporate floating-rate loans and bonds |
| CME Term SOFR | A forward-looking rate derived from SOFR futures prices, known at the start. | Contracts requiring upfront payment certainty |
Why Was LIBOR Retired?
For decades, the London Interbank Offered Rate (LIBOR) served as the world's primary lending benchmark. Its structural flaw was that a panel of banks submitted estimated borrowing costs rather than executing trades.
Post-2008 financial crisis investigations revealed banks manipulated these submissions to flatter balance sheets. Regulators pushed global markets toward SOFR to anchor benchmarks in verifiable transactions. USD LIBOR panels officially ceased publication on 30 June 2023.
Because SOFR is a secured rate and LIBOR was unsecured, legacy contracts transitioning to SOFR incorporate a Credit Adjustment Spread (CAS) to maintain economic equivalence. Furthermore, under RBI and global regulatory frameworks, financial institutions utilise mandatory fallback language to ensure seamless transitions.
TREPS: India's Secured Overnight Market
India runs a comparable secured market through the Tri-Party Repo (TREPS) system managed by the Clearing Corporation of India Limited (CCIL), where institutions borrow rupee cash overnight against Government Securities.
The Reserve Bank of India’s operational target remains the Weighted Average Call Rate (WACR), an unsecured interbank rate. The Marginal Standing Facility (MSF) acts as a separate penal liquidity window above the policy repo rate.
| Feature | SOFR (US) | LIBOR (Retired) | TREPS / WACR (India) |
| Underlying Data | Actual repo transactions | Estimated bank submissions | Actual repo / call-money trades |
| Collateral | Secured by US Treasuries | Unsecured lending | TREPS secured by G-Secs; WACR unsecured |
| Currency | US Dollar | US Dollar (Multi-currency historically) | Indian Rupee |
| Administrator | Federal Reserve Bank of New York | ICE Benchmark Administration | CCIL (TREPS); RBI (WACR) |
Effect on Indian Dollar Borrowings and Portfolio Flows
Indian firms raising capital abroad via External Commercial Borrowings (ECBs) frequently link interest obligations to SOFR. Rising SOFR increases debt-servicing burdens in rupee terms, while falling rates ease them.
Higher US dollar funding costs attract global capital back to dollar-denominated assets, occasionally prompting foreign portfolio investors to trim Indian equity holdings despite strong domestic corporate earnings.
Conclusion
SOFR has become an important benchmark for understanding short-term borrowing costs in the US financial system. Unlike LIBOR, which relied heavily on bank estimates, SOFR is based on actual transactions in the overnight Treasury repo market. This makes it a more transaction-based measure of funding costs. Changes in SOFR can influence the interest rates on loans, bonds, derivatives and other financial products.
For borrowers and investors, understanding how SOFR is calculated and how it moves can provide useful insight into changing financing conditions. As interest rates and market liquidity change, SOFR can fluctuate, so it's important to consider the applicable rate, spread, and adjustment method when evaluating any SOFR-linked financial product.
