US 'Rate Check' Signals Intervention to Bolster Yen

Treasury Signals Support for Plunging Yen

On Friday, the U.S. Treasury took a decisive step to halt the Japanese yen's sharp decline against the dollar. Treasury Secretary Scott Bessent initiated a "rate check," a clear signal that the U.S. government is preparing to intervene in currency markets.

The move came as turmoil in the Japanese bond market began to affect U.S. Treasury yields. Acting as the Treasury's agent, the New York Fed contacted its primary dealers to ask what exchange rates they could offer if it were to begin purchasing yen.

The market reacted instantly. The signal of potential intervention caused the U.S. dollar to fall sharply against the yen. The exchange rate, which had hit 159.2 yen per dollar, reversed course, strengthening the yen to 155.7 by Friday evening.

This chart of the USD/JPY exchange rate shows the yen strengthening significantly after the U.S. Treasury's "rate check" was announced, dropping from nearly 159 to below 156 yen per dollar.

Japanese Bond Market Meltdown Sparks Contagion

The yen's weakness was rooted in Japan's domestic bond market, which experienced a meltdown earlier in the week. The trigger was Prime Minister Sanae Takaichi's call for increased government spending combined with tax cuts.

This announcement spooked investors, leading to a rapid sell-off in Japanese Government Bonds (JGBs).

• The 30-year JGB yield spiked by 42 basis points in just two days, reaching 3.91%—its highest level since its introduction in 1999.

• The key 10-year JGB yield surged by 15 basis points over the same period.

This instability in Japan quickly spilled over into U.S. markets. On Wednesday, Bessent directly blamed the Japanese bond crisis for the surge in long-term U.S. Treasury yields.

Impact on U.S. Yields and Mortgage Rates

The 10-year U.S. Treasury yield had climbed to 4.30% by Wednesday morning, an increase of 17 basis points in a week. This rise complicated the Trump administration's efforts to lower mortgage rates, which typically track the 10-year yield.

As a result, 30-year fixed mortgage rates, which had recently fallen, jumped back to 6.20% from 6.01%, according to Mortgage News Daily.

Bessent addressed the issue on Fox News, stating, "It's very difficult to disaggregate the market reaction from what's going on endogenously in Japan." He noted that he had contacted Japanese officials and was confident they would take steps to calm their markets.

This jawboning, combined with Friday's "rate check," successfully pushed the 10-year U.S. Treasury yield down from its peak of 4.30% to 4.23%.

The 10-year U.S. Treasury yield is shown spiking after the JGB meltdown before declining in response to Secretary Bessent's comments and the "rate check" signal.

A Short-Lived Fix for Mortgage Rates

Separately, the administration has been trying to directly influence mortgage rates. In a move that began in 2025, government-sponsored enterprises Fannie Mae and Freddie Mac started buying back mortgage-backed securities (MBS) they had issued.

On January 8, President Trump directed them to buy back $200 billion in MBS, the maximum allowed under current law. However, the plan faced a practical hurdle: Fannie and Freddie lack the available cash for such a large purchase and would likely need to issue new bonds, which could add more pressure to the bond market.

Despite this, the announcement provided a temporary boost. Mortgage rates plunged by a combined 20 basis points on January 9 and 12. The effect was fleeting. By January 20, rates had returned to their January 8 levels, completing a U-shaped pattern on the chart.

This chart illustrates how 30-year fixed mortgage rates dropped sharply following the announcement of MBS buybacks in mid-January, only to rebound soon after.

Are Underlying Economic Pressures Being Ignored?

While Bessent pointed to Japan, his jawboning conveniently sidesteps pressing domestic issues that are weighing on the bond market. The ballooning U.S. deficit requires a constant flood of new bonds that investors must absorb. At the same time, inflation continues to accelerate, worrying investors who see it eroding the purchasing power of their bond holdings.

Bond yields are meant to compensate investors for this loss of purchasing power, but current long-term yields appear too low to cover the risk of hotter inflation ahead. Government policies of high deficit spending, coupled with pressure on the Fed to cut short-term interest rates, are creating an environment where inflation can thrive.

For now, the bond market remains surprisingly calm despite these ripples. But market confidence built on official statements rather than economic fundamentals may not last long.