Barclays US Rates Research The Treasury is watching

FICC Research Interest Rates 19 August 2026

The Treasury is watching The Treasury doubled long-end buybacks, citing a desire to provide greater liquidity support. By effectively reducing duration supply inter-meeting, the Treasury is signaling that Anshul Pradhan recent pressure on long-end yields has not gone unnoticed. BCI, US Japan's experience offers a warning, but the move buys time. Andres Mok, CFA Early in the week, we argued the Treasury was competing with AI-related corporate borrowing for long-duration funding, which was putting upward pressure on 30y yields (see here). Hence, BCI, US its most direct option to address rising long-term yields was to reduce long-end auction sizes. Demi Hu, CFA We see today's announcement of the increased buyback program at the long end as effectively reducing long-end supply. Such announcements are typically made at the refunding BCI, US meeting, not in between, suggesting that the recent rise in yields did catch the Treasury's attention.

What did the Treasury do? The Treasury announced1 that liquidity-support buybacks in the 10-20y and 20-30y sectors will at least double in size. The current maximum size of $2 billion per operation will be at least $4 billion per operation, starting September 9.2 The additional purchases will effectively be financed through greater bill issuance because coupon auction sizes are likely to remain unchanged. There is precedence; in 2025, the Treasury increased the number of operations at the long end without increasing auction sizes.3

The explanation was straightforward. It cited a desire to provide greater liquidity support in longer-dated nominal sectors where there is consistent, strong sponsorship from market participants. Figure 1 shows that this has indeed been the case, in fact for some time; illiquidity metrics are also starting to inch higher, but from very low levels (Figure 2).

A small change with a larger message The increase amounts to roughly $16bn of additional purchases per quarter(=4 operations * $2bn more * 2 buckets), or $64bn annually. Against $444bn of annual 20- and 30-year issuance, that represents roughly 15% of long-end supply. In 10y-equivalent duration terms, it is approximately $100bn of reduced annual supply (assuming the 20y tenor as midpoint).

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A one-time $100bn 10y equivalent reduction in stock of debt is about 0.3% GDP, which should push the long-end term premium lower by just about 3bp.4 However, since this is effectively an ongoing reduction, not one-time, the announcement effect should be larger. If we think of the announcement as an effective 0.3% GDP permanent reduction in budget deficits, that could amount to 10bp or so in lower term premium at the long end (see here). Market reaction seems reasonable so far.

Still, the effect on the market seems small in the grand scheme of things, but signaling is important. Investors now know that Treasury is prepared to adjust around the edges if long-end yields rise.

What else can the Treasury do? Should the rally reverse, the Treasury can always increase long-end buybacks. The announcement says "at least $4 billion per operation". It is likely that the stated metrics would remain elevated given how far they are versus, say, the 2024 average.

The Treasury also stated, "Based on current projected borrowing needs, Treasury anticipates maintaining nominal coupon and FRN auction sizes for at least the next several quarters. ...Treasury continues to evaluate potential future changes to nominal coupon and FRN auction sizes, with a focus on trends in structural demand and potential costs and risks of various issuance profiles."5

The Treasury can potentially modify this guidance at…