One Year, Eleven Months

One Year, Eleven Months

One year and eleven months is not a thing that securities mature in. The U.S. government is the most standardized borrower in the world: bills in 13, 26 and 52 weeks; notes in round years — two, five, seven, ten; bonds in 30 — announced on a calendar laid out months in advance, in auction sizes that are round numbers. And yet every few months, the Treasury quietly announces that it will sell more of something described as a "1-Year 11-Month" security. In May 2024, for instance, it announced a $28 billion reopening of CUSIP 91282CKM2, a note described in the offering sheet as a "1-Year 11-Month 0.150% FRN (Reopening)," with more than $30 billion of it already sitting in that same line.

That is weird, and the basic point is that it is not weird at all. The label is just arithmetic. A "1-Year 11-Month" is what you get when you issue a two-year note and then, one month later, sell more of the exact same note. Two years minus one month. Presto. "Reopening" is the word for the second sale: instead of inventing a brand-new security with its own CUSIP, its own benchmark status, and its own liquidity problem, the Treasury adds to the size of the one that already exists. Reopenings are how the biggest borrower in the world fattens up an existing line of debt until it is big enough to be worth trading. Repo desks and money managers like one fat, liquid CUSIP far more than two thin ones; the offering sheet's "Currently Outstanding" line is the Treasury bragging about its own bulk.

So what sort of machine keeps producing "1-Year 11-Month" securities forever? It is a floating-rate note, and it is the closest thing the Treasury has to a recurring dark joke in its auction calendar. The coupon on one of these is built from the government's own short-term borrowing rate — reset every week to the 13-week Treasury bill — plus a fixed spread set at the original auction (0.150 percentage points, in the May 2024 case), and it is paid quarterly. No one knows what the coupon will be over the note's life, because it is simply wherever the weekly bill auction happens to clear.

The two-year note that pays like a bill

Why would the world's largest borrower take on two years of floating-rate exposure instead of just locking in a fixed rate? Because a fixed-rate security is a bet on two years' worth of short rates, and the Treasury declined to make it. When it introduced floating-rate notes in 2014 — the first genuinely new Treasury product since TIPS in 1997 — short-term rates were pinned near zero and expected to stay there for years. Selling a floating note let the government keep paying its own rolling money-market rate for two years, without paying a term premium for duration it did not want to own. In 2026 the arithmetic looks different in the other direction — three-month bills were clearing around 3.6 percent this spring — but the machine is the same. The note just hands the current money-market rate straight through to its owner, quarter by quarter.

The interesting part is who is allowed to own it. Money market funds, the big, dull, rule-constrained buyers of short government paper, are generally not allowed to hold anything with more than 397 days to maturity. A fixed two-year note is a non-starter for them. But a note that re-prices every week to the Treasury's own weekly bill auction is, for fund purposes, effectively a security that matures in about a week — the time until the next reset — not two years. The rules were bent, deliberately, to make the government's two-year float a money-market instrument by another name.

So this is the classification joke, stated plainly: the label says note, the coupon says bill, and the money-market rulebook treats the whole thing as a seven-day instrument wearing a two-year contract. A bill in a note's suit, cut to be exactly short enough to fit through the fund door. The "1-Year 11-Month" label is the second seam on the same garment — the visible scar on the calendar left by a market that grows by adding to what already exists rather than by inventing benchmarks.

The honest label

The label turns up on schedule. An $18 billion version crossed the tape in August 2019; the $28 billion one in May 2024; another still shows up in May 2026, a reopening of a note maturing April 30, 2028. There is no new instrument here and nobody is being clever. The Treasury is just, every few months, doing the most boring thing in finance — selling more of something it already sells — and the announcement describes the outcome with a precision that sounds like a joke.

Investor: It's a two-year note, right? Treasury: One year and eleven months. Investor: Wait, what? Treasury: We sold some last month. This is more of the same exact thing. Investor: Then why do you say it like that? Treasury: Because the math is the message. Ask your money fund.

The reason the precision matters is that the whole machine is built on it. Round-number tenors are a marketing convenience — they make a market easy to describe and benchmark. But the Treasury's floating-rate program chose size and fund eligibility over round numbers, and the "1-Year 11-Month" is the tax that decision collects on the calendar. It is the honest name for a security that is legally a two-year note, priced like a weekly bill, and held by funds that are not supposed to touch it. Which is to say: when the world's largest borrower sells you a bond maturing in one year and eleven months, the strangest part is how ordinary it is.