A key indicator of U.S. dollar funding stress has surged to levels not seen since the early pandemic, raising questions about underlying liquidity conditions in the financial system. The spread between the Secured Overnight Financing Rate (SOFR) and the Interest on Reserve Balances (IORB) has climbed to about 32 basis points, the highest level since 2020, according to market data.

This spread measures how much banks must pay to borrow overnight cash using Treasury collateral versus simply earning interest by parking funds at the central bank. A positive and rising spread signals that cash is becoming scarcer relative to collateral. Analysts say the widening gap reflects banks’ growing willingness to pay a premium for funds, even though the overall collateral pool remains large.

Several factors are contributing to the strain. One driver is heavy Treasury issuance, which has flooded markets with debt, tying up collateral-rich securities in hold-to-maturity positions rather than marketable repos. That dynamic has tightened the availability of cash even as collateral is plentiful. Another factor is structural: large banks are holding elevated reserves, and money-market funds are leaning into Treasury bills rather than lending cash in the repo markets.

While equity markets and public headlines may appear calm, the funding plumbing beneath the surface is showing signs of stress. The elevated SOFR-IORB spread is reminiscent of earlier funding squeezes, such as the 2019 repo‐market dislocation and the 2020 Covid turbulence. Some strategists say the risk is not yet acute but that it merits close monitoring, especially as global demand for dollars and short-term funding remains strong.

For the U.S. dollar this signals both strength and vulnerability. On one hand, demand for safe dollar assets remains high; on the other hand, strains in funding markets could amplify volatility in currency, money-market and Treasury sectors. A continued liquidity squeeze might limit the Federal Reserve’s optionality and raise the cost of funding for banks and non-banks alike.

Looking ahead, investors will watch year-end funding flows, Treasury bill auction outcomes and central bank communications for clues. If the SOFR-IORB spread remains elevated or widens further, it could prompt larger policy or balance-sheet shifts by the Federal Reserve. That in turn could feed into dollar strength or market‐wide risk repricing.