
Insight: The yield on 10-year Japanese government bonds (JGBs) hit 3% this week, the highest level since 1996, as part of a global sell-off in sovereign debt. The reasons are not hard to find: renewed Middle East military strikes are pushing the oil price up again, and the US Federal Reserve is likely to hike rates as soon as mid-September to curb inflation, which would practically force the Bank of Japan to tighten a couple of days later. The stark reality is that governments worldwide are simply spending too much… and Japan is no exception. Prime Minister Sanae Takaichi's government is expected to submit a record budget request of around ¥143 trillion ($890 billion) for fiscal 2027, and bond investors are increasingly uneasy about fiscal discipline.
Impact: For corporate Japan, rising interest rates are manageable for now: large companies have been preparing since 2023, locking in fixed-rate borrowing and passing on higher costs by raising prices. Banks actually stand to benefit from wider lending margins, though they also face unrealized losses on JGB holdings. Overall, that should protect stock prices. The greater stress is on the government. The 10-year JGB yield has doubled since Takaichi took office in October 2025. Interest payments for fiscal 2027 are expected to rise by a quarter, with total debt-servicing costs projected to exceed the entire health and welfare budget. That leaves far less headroom for the consumption tax cuts and growth investments that define her agenda. For the yen, the calculus is double-edged: BOJ tightening would support the currency (though any benefit could be erased by simultaneous US rate hikes). But if fiscal credibility erodes and the bond selloff deepens, the yen is going to face pressure that will make its recent weakness look like child’s play.


