Japan Was the World’s Free ATM for 30 Years — That Machine Is Running Out of Cash

For 30 years, Japan operated like a giant, silent ATM for the global economy. Its interest rates sat at essentially zero, which meant investors could borrow yen for almost nothing and lend it out at a profit — to the US government, European banks, emerging markets. This is part of The Rio Times’ daily coverage of global affairs and Latin American financial news.

Economists call it the yen carry trade, and estimates of its total size range from $4 trillion to $20 trillion. That machine is now breaking down.

On Sunday, Prime Minister Sanae Takaichi — Japan’s first female leader — won a historic supermajority, taking 316 of 465 parliamentary seats with a promise to spend big: suspending food taxes, boosting defense, and pouring money into AI and semiconductors.

The problem is that Japan already carries the heaviest debt of any rich nation — 230% of its annual economic output. It could afford this because borrowing cost almost nothing, averaging 0.33% between 2016 and 2025.

Now, with rates surging, analysts estimate the government’s interest bill could leap from 9% to 25% of all spending as that debt gets refinanced.

Japan’s bond shock threatens global rates

Bond markets are sounding the alarm. Japan‘s 40-year yield hit a record 4.2%, the 10-year reached levels not seen since 1999, and one researcher called the bond market “the canary in the coal mine.”

Why should anyone outside Japan care? Because Japan holds $1.2 trillion in US Treasury bonds — more than any other country — and its institutions sit on $5 trillion in overseas assets.

As domestic rates rise, that capital has reason to come home, and even a modest repatriation could mean hundreds of billions in selling pressure on foreign bonds, raising borrowing costs worldwide.

Takaichi’s supporters argue the spending is overdue — that decades of austerity left wages frozen while costs climbed. Critics invoke Liz Truss, whose unfunded tax cuts in 2022 detonated a bond crisis that ended her British government in 45 days. Both sides have a point, which is what makes this so volatile.

The carry trade is not collapsing overnight — Japanese institutions have bought foreign debt for 30 years, and that habit does not reverse in a quarter. But the direction is unmistakable.

The era when Japan quietly subsidized the world’s appetite for cheap money is ending, and every economy that feasted on it should be paying close attention.

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