Japan warns on yen, bond yields as fiscal pressure mounts

Japan is staring down a familiar nightmare: a weakening currency, surging government bond yields, and a record-breaking budget that makes the math harder by the day. Economy Revitalisation Minister Minoru Kiuchi warned on June 9 that officials are prepared to act against excessive yen depreciation, the kind of language Tokyo reaches for right before it actually starts spending foreign reserves.

This isn’t hypothetical. Between late April and May 2026, Japan intervened with a record ¥11.7 trillion ($73 billion) to prop up the yen after it approached the 160-per-dollar threshold on June 3. That level has historically been the government’s red line, and they’re standing right on top of it again.

The numbers behind the pressure

Japan’s fiscal picture is, to put it diplomatically, ambitious. The government approved a record budget of ¥122.3 trillion ($785 billion) for fiscal year 2026. Then in May, it tacked on an additional $19 billion supplementary budget. That’s a lot of spending for a country already carrying one of the highest public debt-to-GDP ratios on the planet.

The bond market has noticed. The yield on 10-year Japanese government bonds stood at 2.67% on June 9, after reaching multi-decade highs earlier. For context, Japanese 10-year yields spent most of the past decade barely above zero. A 2.67% yield might sound modest compared to US Treasuries, but in Japan it represents a seismic shift in the cost of financing government debt.

The Bank of Japan’s policy rate currently sits at 0.75%, and financial markets are pricing in a potential rate hike later this month. Here’s the thing: raising rates to defend the yen would also push bond yields higher, making that record budget even more expensive to service. It’s a classic policy trap, where fixing one problem makes the other one worse.

Kiuchi emphasized the need for close coordination between the government and the BOJ to maintain the 2% inflation target.

Why the yen keeps sliding

The yen’s weakness is partly a Japan-specific story and partly a global one. Japan’s interest rates, even after recent hikes, remain far below those in the US and other major economies. That gap makes the yen a funding currency for carry trades, where investors borrow in yen to invest in higher-yielding assets elsewhere.

Global energy price fluctuations add another layer. Japan imports the vast majority of its energy, so when oil and gas prices rise, the country needs more dollars to pay for them, putting downward pressure on the yen. A weaker yen then makes those imports even more expensive, creating an inflationary feedback loop that hits consumers and businesses alike.

What this means for investors

Japan is the world’s largest creditor nation, and Japanese institutions are among the biggest holders of US Treasuries and other foreign bonds. When the BOJ shifts policy, capital flows globally.

If the BOJ raises rates later in June as markets expect, it could trigger unwinding of carry trades that have been a pillar of global fixed-income markets for years. The last time carry trade unwinding accelerated, in mid-2024, it sent shockwaves through equity and bond markets worldwide.

There’s also the foreign reserve angle. Japan drawing down reserves to defend the yen means selling US Treasuries and other dollar-denominated assets. At scale, that adds selling pressure to an already fragile Treasury market and can tighten dollar liquidity.

If 10-year JGB yields continue climbing from current levels near 2.67%, Japanese institutional investors, think pension funds and insurance companies, may find domestic bonds attractive enough to repatriate capital from overseas.

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