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NewsTopic · 美债收益率见顶机制3 min read·2026-10-16

DoubleLine: October Treasury Yield Peak Driven by Supply, Not Seasonality

DoubleLine portfolio managers argue that the October 2023 peak in U.S. Treasury yields was primarily driven by the Treasury's cash rebuild and Federal Reserve balance sheet reduction, not calendar seasonality. The article compares this to 2026, emphasizing the need to monitor persistent financing needs, policy expectations, and energy-driven inflation shocks.

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2026-10-01 23:52 GMT+8

The path of the 10-year U.S. Treasury yield in 2026 is starting to look remarkably similar to its path in 2023. Through Sept. 30, the yield was up 112 basis points (bps), almost exactly matching the 110-bp increase through the Oct. 19, 2023, peak. September also marked the seventh consecutive month of higher 10-year yields, tying the longest streak in 50 years. This chart similarity invites the question: Does October tend to matter for Treasury yields?

DoubleLine Portfolio Managers Sam Garza and Joseph Mezyk, along with Quant Analysts Fei He and Sunyu Wang, note in their latest blog that while history may rhyme, whether the underlying forces rhyme is a more difficult question. Looking at longer periods, since 1980, January and March have been the most frequent peak months, while January, March and June have led since 2000. October does not stand out. While autumn can bring selling pressures, including tax-loss activity, quarter-end positioning and federal fiscal-calendar flows, they do not provide a compelling explanation for why Treasury yields should reliably peak in October.

In 2023, the October peak had far more to do with market fundamentals than seasonality. After Washington’s debt-ceiling impasse ended in June, the Treasury Department rebuilt a depleted cash balance as privately held net marketable borrowing reached roughly $1 trillion in the third quarter. The Federal Reserve was also shrinking its balance sheet. Subsequent Fed research concluded that the rise in the 10-year yield from late July to October was driven primarily by a higher term premium, with Treasury issuance, quantitative tightening and economic uncertainty contributing.

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Some of the same pressures are present in 2026. Treasury borrowing is projected at $739 billion in the third quarter and $628 billion in the fourth. Unlike in 2023, however, the Fed’s balance sheet is roughly stable. Real yields have again accounted for much of the increase in nominal yields. But the comparison only goes so far. The 2023 issuance surge was abrupt. In 2026, in contrast, heavy financing needs have been more persistent, while tighter policy expectations and an energy-driven inflation shock have played larger roles in the rise in yields.

The more useful lesson from 2023 might be what changed around the peak. By late October, the post-debt-ceiling cash rebuild was largely behind the market, and the Treasury later signaled a smaller increase in long-dated issuance than investors had feared. Inflation also softened, and expectations for Fed policy became less restrictive. The pressures that had driven the sell-off were no longer building with the same intensity. The first nine months of 2026 have traced an unusually familiar path, even if the underlying drivers are not identical to those of 2023. Whether the resemblance survives October will provide another test of how far the comparison can be taken.

Sources

  • 原文与论证doubleline.com↗
Topic

美债收益率见顶机制

DoubleLine指出，2026年10月美债收益率若见顶，其核心驱动力是财政部持续的融资需求与能源通胀冲击，而非日历上的“十月效应”。

4 steps2 piecesUpdated 2026-10-17 21:43

How it got here

  1. 2023-10-1910年期美债收益率达到年度峰值，随后三个月内大幅回落。
  2. 2024-09-03美联储发布FEDS Note，确认2023年收益率飙升主要受期限溢价驱动，而非单纯的经济增长预期。
  3. 2026-09-3010年期美债收益率年内累计上涨112个基点，创50年来最长连续月度上涨纪录（7个月）。

What is still unsettled

  • 2026年第四季度的实际国债发行量是否会低于市场预期？
  • 能源通胀冲击是否会在10月导致美联储政策预期进一步收紧？

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