The Credit Spread Adjustment: How Leveraged Loans Got Repriced After LIBOR

"Walk me through how a leveraged loan gets priced" used to have a one-line answer: LIBOR plus a spread. LIBOR is gone now, and every leveraged loan a candidate will see quoted in a lev fin, private credit, or credit-focused LBO interview today is priced off SOFR instead. The mechanics changed more than most prep materials let on, and interviewers who work with credit agreements every day notice fast when a candidate still describes pricing as if LIBOR never left.

The short version interviewers are testing: a leveraged loan's all-in rate is built from three pieces, Term SOFR, a credit spread adjustment (CSA), and the margin negotiated in the credit agreement, and understanding why that CSA piece exists, and why most new deals don't actually use one anymore, is what separates a candidate who memorized "SOFR replaced LIBOR" from one who understands what that replacement actually had to solve.

Why SOFR Needed an Adjustment in the First Place

LIBOR and SOFR aren't measuring the same thing. LIBOR was a survey-based estimate of the rate banks charged each other for unsecured, uncollateralized short-term loans, which meant it carried an embedded bank credit risk premium. If a bank looked shakier, LIBOR crept up even when nothing else in the market changed. SOFR is a secured, overnight, risk-free rate backed by Treasury collateral, calculated from actual repo market transactions rather than a survey. There's no bank credit risk baked into it at all.

That difference isn't cosmetic. It means SOFR sits structurally lower than LIBOR did, and the gap widens in periods of bank credit stress, which is exactly when a lender cares most about getting paid what they were promised. Swap a loan's benchmark straight from LIBOR to SOFR with no adjustment, and the lender is suddenly earning less on the exact same credit, through no change in the borrower's risk at all. The credit spread adjustment exists to close that gap.

The Three-Part Pricing Structure

A leveraged loan's all-in rate is built from three separate pieces:

• Term SOFR, the forward-looking benchmark published by CME and endorsed by the Alternative Reference Rates Committee (ARRC), set at the start of each interest period the same way LIBOR used to be, so both sides know the rate for that period in advance instead of finding out only at the end.
• The credit spread adjustment (CSA), a fixed add-on meant to bridge the structural gap between SOFR and what LIBOR would have paid for the same credit.
• The margin, the credit spread negotiated in the credit agreement based on the borrower's leverage, industry, and structure, the same number that gets compared under an MFN clause when a borrower raises new debt later.

Add a SOFR floor into the mix (many term loans still carry one) and the all-in rate is whichever is greater, Term SOFR or the floor, plus the CSA if the loan has one, plus the margin. That's the full formula an interviewer wants to hear, not just "SOFR plus a spread."

A Worked Example

Take a term loan that closed years ago priced at three-month LIBOR plus 350 basis points. When that loan transitioned to SOFR under the ARRC's hardwired fallback language, the benchmark itself changed, but the margin the lenders negotiated did not. The ARRC published static, one-time CSA numbers for exactly this purpose: 11.448 basis points for one-month SOFR, 26.161 basis points for three-month SOFR, and 42.826 basis points for six-month SOFR, each one derived from the five-year historical median spread between LIBOR and SOFR at that tenor.

For this loan on a three-month basis, that means the all-in spread over SOFR becomes 26.161 basis points of CSA plus the original 350 basis point margin, or roughly 376 basis points total. If three-month Term SOFR is trading at 4.30%, the all-in rate comes out to about 8.06%, close to what the loan would have paid if LIBOR itself had simply kept trading at its historical relationship to SOFR.

Now compare that to a brand new term loan the same borrower raises today. A new deal doesn't need a CSA to stay economically neutral relative to a benchmark nobody uses anymore. The underwriter just prices the margin directly against where the credit clears in the current market, quoted as SOFR plus 375, full stop. At the same 4.30% SOFR, the all-in rate lands at 8.05%, nearly identical to the legacy loan, but with no separate adjustment line at all. Same economic outcome, one fewer moving part, because the market found it once and had no reason to keep carrying it forward into brand new paper.

Why Most New Leveraged Loans Skip the CSA Entirely

The CSA was always a transition tool, not a permanent feature of loan pricing. Early SOFR-based leveraged loans, starting around 2021, did carry an explicit adjustment, with market convention settling around 10 basis points for one-month SOFR and 15 basis points for three-month SOFR, both noticeably smaller than the ARRC's own recommended numbers. Within roughly a year, most new-issue deals had dropped the standalone CSA altogether and folded the equivalent economics straight into a higher margin instead, commonly 15 to 20 basis points above where the same credit would have priced under LIBOR.

The reason is straightforward once you separate the two situations a CSA can apply to. A legacy loan converting under fallback language needs the adjustment because the original margin was negotiated assuming a LIBOR-based benchmark, and the CSA is what keeps that old deal economically whole. A brand new loan has no such history to preserve. The underwriter and the borrower are pricing directly against Term SOFR from day one, so any compensation for the LIBOR-to-SOFR gap just gets absorbed into the number they'd have negotiated anyway. Carrying a separate CSA line on new paper would be pricing the same thing twice.

That's also why an interviewer might ask you to distinguish a loan still running under ARRC's hardwired fallback from a fresh SOFR-based originations, and why practically every leveraged loan closing today, whether it's financing a sponsor's direct loan or a broadly syndicated deal, will simply be quoted as SOFR plus a margin, with no CSA mentioned anywhere in the term sheet.

Common Follow-Up Questions

"Is the credit spread adjustment the same thing as the SOFR floor?" No, and mixing them up is a common mistake. The floor sets a minimum for the benchmark itself, protecting the lender if SOFR falls very low. The CSA is a fixed add-on meant to compensate for the structural gap between SOFR and LIBOR. A loan can have a floor, a CSA, both, or neither, depending on when it was struck and what convention applied at the time.

"Does the credit spread adjustment show up in the all-in yield used for MFN comparisons?" Yes. All-in yield bundles the margin, any floor, and original issue discount into one annualized number, and if a loan still carries a CSA, that gets included too, since it's part of what the lender is actually being paid. Two loans with identical margins but different CSA treatment aren't priced the same, and an MFN comparison has to account for that.

"Why did SOFR replace LIBOR for leveraged loans at all?" LIBOR was phased out because it was a survey-based rate vulnerable to manipulation, with a scandal in the early 2010s that exposed banks submitting estimates that benefited their own trading positions rather than reflecting real transactions. Regulators pushed the market toward SOFR specifically because it's calculated from actual, observable repo transactions instead of a survey.

"What about loans that are still on LIBOR today?" There essentially aren't any left in the U.S. leveraged loan market. USD LIBOR panels stopped publishing new rates by mid-2023, and any credit agreement that didn't get amended ahead of that deadline transitioned automatically under ARRC's hardwired fallback language, the same mechanic that applies the static CSA numbers described above.

Getting Comfortable With SOFR Loan Pricing

The framework above covers what most interviewers are actually testing: why SOFR needed an adjustment at all, the three-part all-in rate formula, and why the credit spread adjustment shows up on legacy paper but almost never on new-issue deals. Offcycle has this alongside the broader leveraged finance mechanics that come up in the same conversation, including how lenders size debt capacity in the first place under asset-based versus cash flow lending, built into structured flashcards and quizzes you can work through by topic and difficulty, with a readiness score that tracks your progress across LBO, valuation, and credit topics so you know exactly where the gaps are before you're in the room.