US Treasury announces buyback of up to $6B in longer-dated debt

The US Treasury is stepping up its efforts to shore up the long end of the bond market, announcing it will double the maximum size of its liquidity-support buyback operations for longer-dated securities. Starting September 9, 2026, the cap on each operation in the 10- to 20-year and 20- to 30-year nominal coupon sectors jumps from $2 billion to at least $4 billion.

The keyword there is “at least.” Treasury Secretary Scott Bessent indicated the operations could go even larger depending on market conditions, a notable concession that liquidity in the long end is, in his own words, “very poor.”

What the Treasury is actually doing

The expanded buyback program will run from September 9 through November 4, 2026, targeting so-called “off-the-run” Treasuries. These are older issues that trade less frequently than their newly minted counterparts, making them harder to buy and sell without moving the price.

The rationale is straightforward. In previous buyback operations, dealers consistently offered far more bonds than the $2 billion cap could absorb. When sellers keep lining up and you can only take a fraction of what they are offering, the signal is clear: the limit needs to go up.

The market’s polite disagreement

Markets responded the way you might expect to a large government buyer entering the picture. Yields on 10-year Treasuries initially fell about 6 basis points to roughly 4.65%. The 30-year yield dropped even more, declining approximately 9 basis points to around 5.20%.

That relief lasted about as long as a New York minute. Yields resumed their upward march in subsequent days, with 10-year rates continuing to climb despite the Treasury’s pledge to buy billions in longer-dated paper.

The disconnect tells a story about the scale of forces at play. The US government is sitting on roughly $40 trillion in total debt. Even a $4 billion buyback operation, impressive as it sounds, amounts to roughly 0.01% of the outstanding pile.

Persistent inflation concerns and widening fiscal deficits are exerting constant upward pressure on yields, and no amount of liquidity-support purchasing can fully offset the fundamental supply-and-demand dynamics of a government that needs to keep issuing massive amounts of new debt to fund its operations.

Why this matters beyond bonds

For institutional investors, the expanded buybacks offer a practical benefit: knowing the Treasury will reliably absorb off-the-run paper makes it less risky to hold those securities.

Bessent’s candid acknowledgment that long-end liquidity is “very poor” carries its own weight. Senior Treasury officials do not typically volunteer that kind of assessment unless they believe the situation warrants aggressive action.

The next test comes September 9, when the first expanded operation hits the market. How much paper dealers offer, and whether the Treasury opts to exceed its new $4 billion floor, will reveal whether this policy shift is a genuine turning point for long-end liquidity.

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