JGB yields fall 1.5 bps as 600 billion yen auction looms

JGBs rose in early Tokyo trade, tracking overnight gains in U.S. Treasurys, with the 10-year yield down 1.5 basis points at 2.790 percent.

"Demand at this auction is likely to be driven by lifers," Tomohisa Fujiki, rates strategist at Citi Research, said in a research report. "Yields should be at a level sufficient for regular purchases."

The Finance Ministry will auction about 600 billion yen of 30-year JGBs today. The sale comes as long-dated JGB yields have climbed to all-time highs, with the two-year and benchmark 10-year yields at their loftiest levels in three decades, reflecting investor concerns about Japan's monetary and fiscal policy.

The auction follows last week's historic joint U.S.-Japan currency intervention, which saw Washington and Tokyo coordinate to support the yen after it fell to a 40-year low near 164 per dollar. The intervention raised questions about whether Japan might sell U.S. Treasurys to fund future yen-buying operations, a scenario that could push U.S. borrowing costs higher.

Yields at Three-Decade Highs

The Bank of Japan raised its policy rate to 1.0 percent in June, the highest in three decades, but the nominal rate remains deeply negative in real terms — the lowest in the developed world. Investors have lost confidence in the central bank's slow normalization pace, even as Prime Minister Sanae Takaichi pushes a record-breaking spending plan that adds to fiscal concerns.

Japan's Ministry of Finance has conducted several rounds of yen-buying since 2022, spending more than $300 billion. Some of that was financed through dollar deposits, repurchase facilities and swaps, but some involved the sale of U.S. bonds. Japan is America's biggest international creditor, holding $1.14 trillion in Treasurys.

The yen's weakness on a real effective exchange rate basis is unprecedented — it has never been lower. This has made Japanese exports more competitive but has also driven up import costs, adding to inflation pressures that the BOJ is trying to manage.

Intervention Adds to Bond Market Stress

The U.S. bond market has long faced the threat that one of its biggest creditors might liquidate holdings, driving up borrowing costs. While markets have largely shrugged off this scenario for decades, the joint intervention is a reminder that the risk hasn't disappeared. U.S. 10-year Treasury yields already sit at multi-decade highs, and ultra-long yields reached their highest level since 2007 after Fed Chair Kevin Warsh appeared ambivalent about the central bank's 2 percent inflation target.

The term premium — the extra compensation investors demand for holding long-dated Treasurys — spiked sharply in response to Warsh's comments, suggesting markets doubt the Fed's commitment to price stability. This has created a feedback loop: higher Treasury yields push up JGB yields, which in turn pressure the yen, potentially triggering further intervention.

The 30-year JGB auction today will test demand at current yield levels. If the sale draws weak bids, it could push long-dated yields even higher, adding to the pressure on Japanese financial institutions that hold significant amounts of government debt. The Finance Ministry also plans to sell about 2.6 trillion yen of 10-year JGBs on Tuesday, adding to the supply pipeline.

This article is for informational purposes only and does not constitute investment advice.