Japan is done waiting. Prime Minister Sanae Takaichi rolled out a $2.3 trillion economic growth package in late June, and it is massive enough to grab anyone's attention. But here is the catch - Japan is already carrying a debt load that would crush most countries.
That leaves very little room for error. And the cost of borrowing is rising fast. Mallika Sachdeva, a strategist at Deutsche Bank, describes the moment as "at the precipice of a very significant shift in fiscal and industrial policy."
In plain terms, Japan wants to spend big. But higher bond yields make that spending more expensive. The government can only keep its plan alive if the cost of borrowing stays manageable.
For years, Japan has fought to prop up the yen. The currency fell to a four-decade low against the U.S. dollar in the week of July 22, 2026, before bouncing back a bit. At the time of the article, one dollar bought 163.16 yen.
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But the game may be changing. "If fiscal capacity is becoming the most important policy criteria, incentives may be shifting from FX management to yield management; from capping USD/JPY to capping 10-year yields and borrowing costs," she said in her note.
That is a big deal. Japan used yield curve control - a system of pegging long-term borrowing costs - from 2016 to 2024. It helped keep interest rates low and debt payments predictable. Now, with a new growth plan on the table, analysts expect Japan to lean on that playbook again, or something like it.
The bottom line: The central bank, known as the Bank of Japan or BOJ, could be asked to buy more bonds to keep yields down. It could also keep monetary policy loose for longer. Either way, the days of single-mindedly focusing on the yen may be numbered.
So where does the money come from? Japan has one big weapon that most countries do not: a $1.8 trillion pension fund.
The Government Pension Investment Fund, or GPIF, is the country's largest pool of savings. Sachdeva calls it Japan's "biggest weapon." One possible move is for the government to order the GPIF to invest more money at home, buying Japanese bonds instead of foreign assets. That would create demand for domestic debt and help hold down yields.
The Bank of Japan could also step in directly. It holds a massive pile of government bonds already. If the BOJ resumes buying in force, yields drop.
But there is a trade-off. "Efforts to suppress yield volatility could come alongside bigger moves in FX from here," Sachdeva warned.
Translation: If Japan stops worrying about the yen so much, the currency could swing more wildly.
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