Why a Three-Month Bill Pays More Than the Fed's Rate

The three-month Treasury bill yields 4.21%, and the effective federal funds rate averaged 3.88% in October. The bill pays 33 basis points more than the rate the Federal Reserve sets. That gap is not free money. A bill matures in three months, so its yield has to reflect what the overnight rate is expected to average over the holding period. When the bill pays more than the current rate, its buyers expect the rate to rise.

The instrument forces the arithmetic. A bill is bought at a discount and repays par, so the buyer's return is locked at purchase and cannot reset. Choosing a bill over rolling overnight funding means giving up the right to reprice higher if policy moves. The discount is where that right is paid for, which is why the bill curve leads the policy rate instead of following it.

Both legs moved in 2026, but not equally. The bill is 56 basis points above its first close of the year, while the effective funds rate is 24 basis points above its January level. The spread widened rather than closed, so the market added more tightening to the next three months than the committee delivered.

The rest of the curve agrees. The two-year yields 4.59%, 38 basis points above the bill, and the ten-year at 4.91% sits 70 basis points above it. A curve that slopes upward from three months to ten years prices a policy rate that is higher on average over two years than over three months, and higher again over a decade. That is a path, not a meeting.

A forecast is not the only thing being priced. Bill yields also have to clear the market for bill supply, and a heavier bill calendar widens the discount needed to place the paper. On a chart, a spread widened by supply and a spread widened by expectations look identical and are different facts. The order of events separates them: expectation-driven widening builds before a meeting and unwinds after it, while supply-driven widening does not.

What would break this reading: a meeting that ends with no change in the target range while the bill keeps trading 33 basis points above the effective rate. That combination would make the gap a supply or year-end technical story, and the policy-forecast interpretation above the wrong one.