Treasury-backed overnight funding benchmark widely used in floating-rate loans, swaps, and U.S. dollar valuation.
SOFR stands for the Secured Overnight Financing Rate. It measures the cost of borrowing cash overnight when the borrowing is secured by U.S. Treasury collateral.
In finance practice, SOFR is an important benchmark because it reflects real funding transactions rather than judgment-based bank submissions.
SOFR matters because modern floating-rate finance needs a benchmark that is:
That is why SOFR became a major replacement benchmark after the decline of LIBOR in many U.S. dollar contracts.
You now see SOFR used in:
SOFR is an overnight rate, so many contracts do not simply quote one day’s value and stop there.
Instead, finance teams often work with:
That matters because a floating-rate loan tied to SOFR may calculate interest from a compounded or averaged series rather than from one headline print.
SOFR is also different from retail-style rates such as the Prime Rate. Prime is a bank lending benchmark. SOFR is a wholesale funding benchmark rooted in secured money markets.
Suppose a floating-rate note pays:
If the relevant compounded SOFR for the interest period is 4.80%, the coupon for that period becomes:
If short-term funding conditions change, the SOFR component changes with them, and the note’s interest expense adjusts accordingly.
| Benchmark | Market base | Credit exposure in the benchmark | Typical use |
|---|---|---|---|
| SOFR | Secured overnight Treasury-backed funding market | Very limited direct bank-credit component | Modern dollar loans, swaps, structured finance, and discounting |
| LIBOR | Historically panel-bank submissions for unsecured funding | Embedded unsecured bank-credit element | Legacy contracts and historical comparison work |
| Prime Rate | Bank-published lending reference | Borrower and product-specific lending spread layered around a published base | Retail and commercial variable-rate loan pricing |
This is why a move from LIBOR to SOFR is not just a naming change. The benchmark base, credit content, and contract mechanics all shift.
LIBOR embedded bank credit judgment and term structure in a different way. SOFR is based on secured overnight transactions and does not directly represent unsecured bank credit risk.
SOFR is a wholesale market benchmark. Prime is a lending benchmark banks publish for borrower pricing.
Most contracts add a spread on top of SOFR to reflect credit risk, product structure, and lender economics.