The most sensitive moment for US Treasuries: $16 billion long-term bond auction + Fed minutes, market test coming tomorrow morning

Original Author: Zhang Yaqi

Source: Wallstreetcn

The global bond market is experiencing its most violent selloff in decades, and the U.S. market is about to face two major stress tests on the same day.

In the early hours of August 20 Beijing time, the U.S. Treasury will auction $16 billion in 20-year bonds, and the Federal Reserve's July meeting minutes will also be released at 2 a.m. Beijing time. These two events weigh on different parts of the yield curve—the former concerns long-end rates, while the latter affects short-end expectations.

The market's biggest fear is a scenario where a weak auction and hawkish minutes land on the same day, reinforcing each other and pushing the entire yield curve higher, with spillover effects spreading to tech stocks, emerging markets, and highly leveraged trades.

Prior to this, global long-end rates have already approached multi-year or even multi-decade highs. The 30-year U.S. Treasury yield briefly touched 5.327% during trading on Tuesday, the highest level since June 2007, while the 10-year yield rose to 4.747%, a new high since January 2025. Meanwhile, U.S. stocks have fallen for three consecutive trading sessions, with the S&P 500, Nasdaq Composite, and Dow Jones Industrial Average all under pressure.

The First Test: Who Still Wants to Lend to the U.S. for 20 Years

This 20-year Treasury auction will be priced at a yield near 5.28%—the secondary market rate for the existing 20-year bond on Tuesday, and the highest borrowing cost for this tenor since its issuance resumed six years ago.

The significance of this auction extends far beyond routine financing operations. The U.S. fiscal deficit has approached $1.8 trillion since the start of this fiscal year, and the total U.S. national debt is about to break through $40 trillion for the first time. Last week's 30-year Treasury auction saw a high-yield of 5.216%, the highest in about 25 years. The Congressional Budget Office also raised its fiscal 2026 budget deficit forecast last week to $2.1 trillion, $200 billion higher than its February projection.

What the market is truly testing is whether buyers will return to the table at such elevated yield levels. If the final high-yield comes in noticeably higher than pre-auction levels and bid demand is weak, it would signal further deterioration in the supply-demand dynamics of long-dated debt, putting greater upward pressure on long-end yields.

According to Yulia Alekseeva, head of fixed income at MissionSquare, fiscal deficit concerns are the "most dominant and persistent driver" of the recent long-end Treasury selloff. She also noted that the large volume of long-duration corporate bonds issued by "hyperscalers" to fund data center construction is adding to supply pressure. Goldman Sachs trading desk data shows that AI-related bond issuance has reached $489 billion, and the sheer scale of bond supply pressure has prompted Rich Privorotsky, head of European spot trading at Goldman Sachs, to warn:

"At some point, the Fed might even be forced to hike rates even as data weakens, in order to flatten the yield curve and re-anchor long-end rates."

The Second Test: Can the Warsh Minutes Untangle the Policy Puzzle

The market significance of this Fed July meeting minutes goes far beyond previous releases.

Since Fed Chair Warsh took office, he has significantly reduced forward guidance, with shorter policy statement language, and press conferences have rarely provided directional clarity for markets. Michael Gregory, deputy chief economist at BMO Capital Markets, noted in a client report that the minutes have gained considerably in importance under the new framework of "brief policy statements, vague press conferences, and reduced forward guidance." Will Compernolle, macro strategist at FHN Financial, also said the minutes "may now reveal internal discussions not disclosed during Warsh's vague press conference last month."

The July meeting left a clear suspense: The Fed held rates steady at 3.5% to 3.75%, but 3 of the 12 voting members directly supported a rate hike. Alex Pelle, U.S. economist at Mizuho, expects those three votes to be just "the tip of the iceberg," with the minutes likely showing that among the 19 senior officials, the group favoring hikes is broader than publicly recognized. "At every Fed meeting since the start of the year, there have been more hawkish officials," Pelle said.

The June minutes already outlined two paths: If inflationary pressures ease quickly, most officials leaned toward holding rates steady and eventually easing policy; if AI-related spending, Middle East conflicts, and tariffs continue to push inflation higher, most officials believed further rate hikes might be necessary. Kurt Lewis, head of central bank policy research at Piper Sandler and a former Fed official, noted that this means more than half of the voting members have factored both scenarios into their thinking, which is "significant."

Currently, the Atlanta Fed's market probability tracker shows the odds of a September rate hike have fallen from 82% after the July meeting to 59%, mainly due to recent softer inflation data. However, if the minutes reveal that hawkish forces are stronger than the market expects, the cooling rate-hike expectations could reignite.

Tech Stocks Under Pressure: The Cascading Impact of a Broad Yield Curve Shift

Jonathan Krinsky, chief technical strategist at BTIG, warned in a report: "We believe the equity market is not prepared for a rapid rise in long-end rates—for example, the 30-year yield heading toward 6%." He noted that since early August, the 30-year Treasury yield has broken out of a three-year trading range, and technical signals suggest this selloff is not over.

John Velis, FX and macro strategist for the Americas at BNY, said the surge in long-end rates reflects both the long-term trajectory of monetary policy and surging capital demand driven by tech and AI capital expenditures. "This isn't directly crowding out Treasury investment, but it's raising the cost of capital across the board," he said.

Looking at historical precedent, according to statistics from X account Oddstats, the only prior instance of the 30-year Treasury yield moving from the 4% range to the 6% range within six months occurred in June 1999. Less than four months later, the S&P 500 entered a correction; nine months later, the index recorded its final all-time high before the dot-com bubble burst. Notably, the 30-year yield was still below 4.6% as recently as March of this year.

If hawkish minutes and a weak auction land on the same day, the logical consequences are clear: Short-end rates come under pressure from rising rate-hike expectations, long-end rates continue to climb due to weak demand for long-dated debt, and the entire yield curve reprices. High-valuation tech stocks will bear the brunt—rising long-end rates raise discount rates and compress theoretical equity valuations, while higher short-end rates mean corporate financing costs rise simultaneously.

This Isn't Just a U.S. Story

This bond market storm has already spread to major developed economies. Germany's 30-year yield rose to a 15-year high of 3.763%, France's same-tenor yield touched its highest level since 2008, and Japan's 30-year yield climbed to 4.1285%, surpassing its 30-year high from earlier this spring. According to Bloomberg-compiled data, the average yield on a benchmark portfolio of investment-grade sovereign bonds has surged to approximately 4.5%, the highest since records began in 2015.

Luis Alvarado, co-head of global fixed income at Wells Fargo Investment Institute, said, "Nearly all major fixed income markets are showing the same trend—the deficit problem is global, not a uniquely U.S. story." However, he also emphasized that the U.S. Treasury market is far larger than the combined bond markets of Japan, the U.K., the EU, and other Asian countries, giving U.S. problems stronger transmission effects.

Charles Luke, chief investment officer at City National Bank and RBC Rochdale, noted that as global rates rise, some capital is flowing back to other markets, "which naturally puts some pressure on foreign buyers of Treasuries." He said bluntly: "I think the Treasury Department is genuinely a bit nervous right now."

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