Long-duration US Treasury yields climbed back on Thursday after a brief decline the previous session, with the 30-year yield trading near 5.27% intraday, nearly erasing all losses from the initial rally following the Treasury Department's announcement to expand its buyback program. While Treasury Secretary Scott Bessent signaled the possibility of further increasing repurchase efforts, investors and analysts largely view these buybacks as providing only short-term liquidity support rather than addressing the structural issues driving long-end yields higher, including fiscal deficits, debt expansion, and inflation concerns.

On Wednesday, the US Treasury announced it would more than double the scale of its liquidity support buyback operations for 10- to 30-year bonds, raising the minimum size of each operation to at least $4 billion. The move came after long-end yields had climbed to their highest levels since 2007, with the department stepping in following a selloff to ease market pressure. Following the announcement, robust buying emerged across the long end, with the 30-year yield plunging approximately 9 basis points in a single day, while the US dollar index fell nearly 1%, marking its largest daily drop since March.

However, the reprieve proved short-lived as selling resumed just a day later. On Thursday, the 30-year Treasury yield rose to 5.27% intraday before trading around 5.25%, gaining approximately 5.5 basis points on the day, while the 10-year yield advanced 4.7 basis points to around 4.70%. This followed Tuesday's session when the 30-year yield touched a 19-year high of 5.34%. The dollar index edged up to 98.88 on Thursday. Other markets showed mixed reactions: Japan's long-end yields pulled back significantly, while Germany's 30-year yield only dipped modestly from Wednesday's 15-year high, with European markets responding relatively mildly.

Bessent Hints at Further Expansion, But Market Remains Skeptical

Treasury Secretary Scott Bessent indicated in an interview Thursday that he might raise the scale of government bond repurchases again. He noted that the objective is to support market liquidity, particularly in the thinly traded long-dated Treasury segment during August, while also competing with substantial high-yield corporate bond issuance, including financing for AI infrastructure. Yet the market does not believe this measure will be sufficient to reverse the trend.

Louis Alvarado, co-head of global fixed income at Wells Fargo Investment Institute, stated that the Treasury's action can only provide "short-term relief" because the key drivers pushing yields higher, such as inflation, monetary policy uncertainty, and massive fiscal deficits, remain unresolved. He remarked: "Until investors receive clearer signals on these major issues, rather than relying on today's piecemeal fixes, the risks to the longer-term trend remain tilted to the upside."

Jon Walsh, portfolio manager at TwentyFour Asset Management, commented: "This measure alone is unlikely to work; such intervention is at best a stopgap." Michael Guse, chief investment officer for fixed income at Principal Asset Management, added: "Any intervention typically has limited effectiveness over the long run. After a period of time, yields tend to revert to their original levels." He believes the Treasury has other options, but they are unlikely to bring substantial change. "The reality is that funding needs span the entire yield curve, so this kind of adjustment is unlikely to have a significant impact on long-term bond yields."

One of the biggest factors pushing up long-end yields is the US fiscal situation. According to Treasury Department data, US national debt surpassed $40 trillion for the first time on August 18, having more than doubled since President Trump's first inauguration in 2017. Expensive pandemic response measures and prolonged tax and spending imbalances have continued to inflate the debt burden.

JPMorgan analysts noted in a report that the Treasury's announcement does little to address the underlying issues driving bonds higher, including unsustainable fiscal deficits and rising inflation expectations. Given the Trump administration's plans for tax cuts and increased defense spending, most analysts believe deficits are unlikely to shrink significantly in the near term. Joe Brusuelas, chief economist at RSM US, said: "Unless there are tax increases, slower government spending growth, or genuine fiscal consolidation through spending cuts as seen in the 1990s, the buyback effect will only be temporary."

Buybacks vs. QE: A "Drop in the Bucket"

Particularly noteworthy is the market sentiment that the current buyback scale is too small to redirect the direction of the long-end bond market. Keith Patton, global head of rates and fixed income at Columbia Threadneedle Investments, said that compared to the Federal Reserve's past quantitative easing (QE), this buyback program is "negligible" in size. He emphasized that for such market intervention to be effective, it must be accompanied by a shift in core government spending policy.

The measure differs fundamentally from Fed QE: QE directly reduces the private sector's holdings of long-dated bonds and duration risk through large-scale purchases, thereby compressing long-end yields, whereas the Treasury's buyback program focuses more on improving bond market liquidity. Market experts cited in related reports note that the buyback size is insignificant compared to QE, and without additional policy changes such as fiscal spending adjustments, the effect is likely to be temporary.

Although the amount is limited within the $32 trillion Treasury market, analysts believe the move still demonstrates the government's sensitivity to rising long-end rates and its inclination toward market intervention. US mortgage rates have already climbed alongside long-end yields and have repeatedly become a focal point of market attention.

Meanwhile, global long-end borrowing costs have risen to multi-decade highs, as governments accumulate record debt from successive crises including the pandemic, the Iran war, aging-related welfare spending, and defense expenditures. Rising long-end borrowing costs increase government interest payments and transmit across the entire financial market as a pricing benchmark for corporate bonds, equities, and real estate.

Germany's Finance Ministry stated that the Russia-Ukraine conflict is driving up demand for defense investment funds, thereby pushing borrowing costs higher. Japan's borrowing costs have also risen to three-decade highs, putting pressure on government finances and its expenditure-led growth agenda. In the US, investors worry that authorities may be unable to control inflation triggered by the Iran war, with this unease suppressing long-dated bonds for months. Analysts say the latest wave of long-end selling reflects investor concerns about inflation control prospects and the surge in US public debt.

Policy Signals and Side-Effect Concerns

Some investors are also questioning whether the Treasury or the Fed has the greater impact on the overall credit environment at this point. Just weeks after the Treasury intervened in currency markets by buying yen, the additional expansion of long-end bond buybacks has made the market more sensitive to its interventionist tendencies. Eric Robertson, global head of research at Standard Chartered Bank, said: "I would not describe the rise in Treasury yields as the result or intensification of irrational market conditions. The only conclusion to be drawn is that yields reached a level they didn't like, which implies a willingness to try to control or intervene in the natural supply-demand relationship."

MUFG, meanwhile, pointed out that the Treasury's unplanned expansion of buybacks could give the impression of lacking strategic planning, warning that if the government attempts to control long-end yields through market signals alone without fiscal consolidation, it could actually weaken demand for US assets and the dollar. These perspectives collectively point to a shared conclusion: until core issues such as fiscal policy and inflation are substantively addressed, any decline in long-end yields may lack durability. The Treasury's buyback tool may improve market liquidity and ease selling pressure in the short term, but it is unlikely to reverse the upward trend in long-term interest rates on its own.