A narrow, technical-sounding spread that’s actually one of the cleanest signals of stress in the banking system’s plumbing. Here’s why traders watch it carefully.
The SOFR/Treasury Spread measures the gap between what banks pay each other for overnight cash (SOFR) and what the U.S. government pays for 3-month money (T-bills). When the gap widens, it usually means banks are starting to hoard cash — a classic early sign of liquidity stress that often precedes broader credit problems.
The SOFR/Treasury Spread compares two short-term interest rates:
SOFR (Secured Overnight Financing Rate) is what big financial institutions pay to borrow cash overnight, backed by U.S. Treasury collateral. It’s essentially the cost of overnight money in the institutional banking market.
3-month Treasury bills represent what the U.S. government pays to borrow for three months. Because government debt is considered the safest possible borrower, this rate is the benchmark for risk-free short-term lending.
The spread between them is normally small — just a few basis points. SOFR sits slightly above T-bills most of the time because banks need an incentive to lend to each other rather than just buying T-bills. But when banks get nervous about each other’s solvency, SOFR jumps. That’s when the spread widens, and that’s when something is breaking.
When banks stop trusting each other, the SOFR spread is the first place it shows up.
This indicator is a stress gauge for the financial system’s pipes. Most of the time, it sits quietly in the background — banks lend to each other at predictable rates, and the spread barely moves. But when it starts widening rapidly, something has gone wrong in the banking sector.
Historically, sharp moves in this spread have preceded almost every major financial crisis. The TED spread (its predecessor) widened sharply before Lehman Brothers collapsed in 2008. The current SOFR spread spiked during the 2020 COVID liquidity crisis before the Fed stepped in.
Unlike credit spreads, which can move on broader economic news, the SOFR/Treasury spread is almost purely a measure of banking system trust. When it moves, you know something is happening specifically in interbank funding markets — not in equities, not in commodities, not in macro sentiment.
This makes it one of the cleanest early warning signals in finance. It moves before headlines, before stock prices, and often before regulators publicly acknowledge a problem.
To know whether a reading is meaningful, you need to know where the indicator has been historically. Here's how the SOFR/Treasury Spread has behaved through major moments since 2018:
The historical pattern is consistent: this spread spends most of its time near zero, then spikes sharply when banking stress emerges. Persistent readings above 15 bps are unusual and worth watching. Sharp widening (more than 10 bps in two weeks) almost always indicates a specific liquidity event.
Click any tip to expand.
A spread of 8 bps is unremarkable. A spread that moved from -5 to +8 in a week is significant. This indicator is most useful when watching for sudden changes, not interpreting steady states.
SOFR can trade below T-bills in periods of excess liquidity (when the Fed’s balance sheet is large). Negative spreads aren’t a stress signal — they’re actually a relaxation signal. Stress shows up when SOFR climbs sharply above T-bills.
SOFR is itself a derivative of the repo market. Sometimes the spread widens because of specific repo market dislocations (like September 2019’s repo spike), not generalized banking stress. Cross-checking with overnight repo rates helps distinguish technical issues from broader stress.
Sustained readings above 15 bps historically signal real funding stress. Below 10 bps is normal background variation. Between 10 and 15 is worth tracking but not alarming.
Three things people often get wrong about reading the SOFR/Treasury Spread.
Not always. Quarter-end, year-end, and tax-payment dates can cause temporary widening as banks demand more liquidity. These mechanical pressures usually resolve within days. Real stress signals persist beyond a few trading days.
Indirectly. The Fed sets the target range for the federal funds rate, which SOFR tracks closely. But SOFR is determined by actual market transactions, not Fed policy. The spread to T-bills reflects market dynamics the Fed can influence but doesn’t directly control.
Yes — if only as a check on whether broader narratives are supported. When stocks are dropping on “banking concerns,” look at this spread. If it’s not moving, the concerns probably aren’t affecting actual bank funding. If it is moving, the stress is real.
The SOFR rate is published daily by the Federal Reserve Bank of New York. The 3-month Treasury bill rate is published daily by the U.S. Treasury and aggregated by the Federal Reserve. MacroRead pulls both from FRED:
SOFR for the secured overnight financing rate, and DGS3MO for the 3-month constant-maturity Treasury yield, with DTB3 as fallback.
The spread is calculated as the difference between these two rates, expressed in basis points. Updates daily with about a one-day lag.
SOFR/Treasury Spread is one piece of a broader macro picture. These give complementary readings:
MacroRead tracks this indicator alongside nine others, all updated daily with normalized scores, historical context, and plain-English interpretation. No subscription required.
View Live Dashboard