Treasury yields, the Sept. 2026 buyback expansion and the deficit

Case

On Sept. 9-10, 2026 Treasury tripled its long-bond buyback to $6 billion, and yields rose anyway: the 10-year hit about 4.85% and the 30-year about 5.3%. Analysts said the size disappointed, and oil above $100 contributed. Separately, the tax law and deficits are part of the bond-market debate.

The Sept. 2026 buyback and yields
On Sept. 9, 2026 Treasury announced a maximum $6 billion buyback for the next day's operation, triple the $2 billion amounts used since the Yellen era.
The 10-year yield spiked to 4.85%, the highest since October 2023, and the 10-year auction cleared at 4.834%, which Wolf Street called the highest auction yield since August 2007.
The 30-year yield briefly hit 5.31%, matching its prior multi-decade high.
Analysts said the $6 billion was near the low end of expectations (some wanted $10 billion or more), and one called it 'more or less a shell game.'
Euronews said yields also rose as Brent crude passed $100 a barrel amid US-Iran tensions.

What Treasury announced
Treasury's notice raised the maximum size of its long-end buyback operations from $2 billion to at least $4 billion, in the 10-to-20-year and 20-to-30-year sectors, for operations running Sept. 9 through Nov. 4, 2026. Fortune dates the expanded program to Aug. 19, 2026, after the 30-year yield hit a 19-year high; the notice's own publication date was not confirmed here.
The Sept. 10 operation was for up to $6 billion in 10- to 20-year bonds, triple the previous long-dated operation. Euronews gave Sept. 11 as the date; the wire copy and Treasury's schedule point to Thursday, Sept. 10.

The deficit
CBO's monthly review, as summarized by The Fiscal Times on Sept. 9, 2026, put the federal deficit at $2.0 trillion for October 2025 through August 2026, $6 billion smaller than the same period a year earlier; adjusted for calendar timing effects it would have been $82 billion larger.
The same report put receipts at $4.8 trillion (up 3%) and outlays at $6.8 trillion (up 4%) on a timing-adjusted basis, and cited the Committee for a Responsible Federal Budget's statement that annual interest costs now exceed spending on national defense.

Criticism of the buybacks
Stanley Druckenmiller, Bessent's former mentor, wrote in the Wall Street Journal that the expanded buybacks "wasn't liquidity management, it was price management," and that "if the 30-year must trade at 5.5% to clear, that isn't a crisis. It is an invoice." Fortune reported on Aug. 25 that Treasury did not respond to its request for comment.
Fortune reported on Sept. 11 that the buyback plan "has had no discernible impact," with the 30-year at 5.35% and the 10-year at 4.94%, higher than before the intervention. Bessent said: "If some of the Bloomberg Terminal bros are unhappy with what I'm doing, well, that's too bad," and argued term premiums do not show investors demanding excessive compensation.

Perspectives

Expert view — Briefing.com's Patrick O'Hare
The smaller-than-expected size could help explain the jump in yields, and the market may view the program as more or less a shell game.

Research notes
Resolved: Treasury's own notice covers the 10-to-20-year and 20-to-30-year sectors, and the Sept. 10 operation was up to $6 billion in 10- to 20-year bonds (Wolf Street's list of 2040-2046 maturities fits that). Open leads: CBO deficit figures, results of the buyback operation itself, and the 10-year auction result from Treasury.

Note
Yields rose to highs not seen in years, but the sources do not show an all-time record.

Sources
[1] Wolf Street (https://wolfstreet.com/2026/09/09/10-year-to-30-year-treasury-yields-jump-after-bessent-reveals-bond-buybacks-for-tomorrows-auction/) · 2026-09-09
[2] Euronews (https://www.euronews.com/2026/09/10/us-treasury-yields-surge-as-6-billion-bond-buyback-disappoints-markets) · 2026-09-10
[3] U.S. Treasury — increased sizes of long-end buyback operations (https://content.govdelivery.com/accounts/USTREAS/bulletins/425aba1) · 2026-09-09
[4] Kitco (wire) — Treasury to buy up to $6 billion in Sept. 10 buyback (https://www.kitco.com/news/off-the-wire/2026-09-09/us-treasury-buy-6-billion-sept-10-buyback-operation) · 2026-09-09
[5] The Fiscal Times — Deficit Hits $2 Trillion in Fiscal Year 2026 (citing CBO) (https://www.thefiscaltimes.com/2026/09/09/Deficit-Hits-2-Trillion-Fiscal-Year-2026) · 2026-09-09
[6] Fortune — Bessent, Druckenmiller and the buyback critique (Aug. 25, 2026) (https://fortune.com/2026/08/25/scott-bessent-stanley-druckenmiller-and-a-hedge-fund-legend-hoist-on-his-own-petard/) · 2026-08-25
[7] Fortune — Bessent and unhappy bond investors (Sept. 11, 2026) (https://fortune.com/2026/09/11/scott-bessent-bond-investors-unhappy-policy-tariffs/) · 2026-09-11

Connections

Related — Himes' Sept. 2, 2026 House Financial Services speech: tariffs, deficits, labor, the Iran war and consumer sentiment
Himes said yields were at record highs; this entry records what the sources show (multi-year highs, 30-year matching a multi-decade high).

Same context — Immigration enforcement and the immigrant workforce (2025-2026)
Both are parts of the economic argument over the administration's policies in 2026.

Related — Trump's $5,000 "Trump Dividend" pledge to voters (Sept. 2026)
The pledge's $1 trillion-plus cost lands on a $2 trillion annual deficit and rising long-term yields.

Same context — Trump's inflation claims versus the CPI data (2025-2026)
Inflation and Treasury yields moved together in 2026, with oil prices a shared factor in both.