On the first day of July the yen fell to its weakest level against the dollar since 1986, the year after the Plaza Accord reshaped the currency for a generation.1 The timing was awkward. Two weeks earlier the Bank of Japan had raised its policy rate to 1 per cent, the highest level since 1995, continuing a two year campaign to dismantle the most extreme monetary experiment any G7 central bank has run.2 By the textbook, raising rates should support a currency, not watch it sink through a forty year floor. This failure is the central fact of Japanese monetary policy in the middle of 2026, and it says as much about the limits of central banking as it does about Japan itself.

Key figures: Policy rate: 1.0% · USD/JPY ¥162 ≈ $1 · 10 year JGB yield: around 2.8% · Wholesale inflation (May 2026): 6.3% · Public debt: over 230% of GDP

How the cycle began

For eight years, until March 2024, the Bank of Japan ran the only negative interest rate policy left anywhere in the world, paying financial institutions to lend rather than hoard cash. It capped the ten year government bond yield near zero under a programme called yield curve control, and bought so many bonds and shares that its holdings once amounted to roughly half of all outstanding Japanese government debt.3 Governor Kazuo Ueda, a monetary economist who took office in April 2023, began dismantling this system a year later. The path since has been slow by design and, once, violent by accident.

DatePolicy rateContext
March 20240 to 0.1%Negative rates and yield curve control abandoned after eight years
July 20240.25%Hike sets off the August 2024 carry trade crash
January 20250.50%Highest level in 17 years
December 20250.75%Unanimous vote; highest in roughly 30 years
April 20260.75% (held)Board split 6 to 3 amid an oil shock from the Middle East
June 20261.00%7 to 1 vote; Governor Ueda absent through illness
Bank of Japan policy rate (uncollateralised overnight call rate target), March 2024 to July 2026 (rate unchanged since the June 2026 hike). Source: Bank of Japan.

The July 2024 increase is worth pausing on, because it previewed everything that followed. Combined with weak American jobs data, it set off a rapid unwind of positions funded in cheap yen. The Nikkei fell 12.4 per cent on 5 August 2024, its worst day since the 1987 crash, as investors who had borrowed cheaply in Tokyo to buy assets elsewhere rushed to buy back the currency they owed.4 The Bank took the lesson to heart. Every increase since has been signalled well in advance.

Inflation has cooperated with the case for tightening, if not always for reasons the Bank would choose. Headline inflation ran above the 2 per cent target for 45 consecutive months through late 2025,5 though by the spring of 2026 both headline and core inflation had cooled to around 1.4 per cent, back below target, largely because government energy subsidies were holding consumer prices down. What kept the case for tightening alive was pressure further up the supply chain: wholesale inflation reached 6.3 per cent in May 2026, the highest reading since March 2023, driven this time by oil rather than a weak currency.2 In its statement accompanying the June decision, issued while Ueda was in hospital, the Bank pointed to the situation in the Middle East and a rapid pass through of crude prices into business costs as reasons underlying inflation could run above 2 per cent rather than settle at it.6

Takaichi's bind

If the Bank has a problem larger than inflation, it is fiscal policy, specifically the government's. Sanae Takaichi became prime minister in October 2025 on a platform openly nostalgic for Abenomics, the reflation focused doctrine of the 2010s, and duly delivered Japan's largest stimulus since the pandemic, worth 21.3 trillion yen, around 135 billion dollars, in cash handouts, energy subsidies and food vouchers.7 In January 2026, seeking a mandate through a snap election, she went further and floated a two year suspension of the consumption tax on food.

Bond investors did not share her optimism. On 20 January the yield on Japan's forty year bond broke 4 per cent for the first time since that maturity was created in 2007, the ten year touched its highest level since 1999 at 2.38 per cent, and the twenty year jumped to 3.47 per cent.8 Anyone who followed Britain's 2022 gilt crisis will recognise the shape of what came next, when unfunded tax cuts briefly broke the market for UK government debt. Japan's version was gentler, because the Bank of Japan already had decades of large scale bond buying behind it rather than having to improvise an emergency response.

Japan 10-year government bond yield, month-end (July as at 6 July 2026), December 2025 to July 2026. Source: Japan Ministry of Finance.

Takaichi won her election on 8 February 2026 and has since pursued a subtler approach than public criticism of the Bank, which would spook the same markets she needs to keep calm. She has used appointments instead. Her first pick for the policy board, Toichiro Asada, voted against the June increase to 1 per cent within months of being seated, arguing that the risk to production and employment outweighed the risk of higher prices.9 A second appointee with similarly dovish leanings joined the board the same month. Names already circulate for who might eventually succeed Ueda, whose term runs to 2028, and reflation minded economists close to Takaichi feature prominently among them.

Who wins and who loses at home

The domestic effects of two years of tightening are not evenly shared. The clearest winners are the banks. Mitsubishi UFJ, Sumitomo Mitsui and Mizuho, the three so called megabanks that dominate Japanese finance, each reported record annual net profit for the fiscal year ending in March 2026, up 30, 34 and 41 per cent respectively, as decades of near zero lending margins finally began to widen.10 Savers are being paid to hold yen for the first time in a generation, even if real returns remain thin.

Wages sit at the centre of the Bank's own case for tightening, and the picture there is genuinely mixed.

Shunto wage settlement, 2026: Headline increase: 5.26% · Base pay increase: 3.85% · Third consecutive year above 5% · Real wages, 2025, year on year: down 1.3%

Rengo, the union federation that runs Japan's annual spring wage negotiations known as shunto, secured average increases above 5 per cent for a third year running, the strongest run in more than three decades.11 Yet separate analysis of the same wage data shows real wages, adjusted for inflation, falling for a fourth consecutive year in 2025, as price rises and higher social insurance costs absorbed most of the nominal gain.12 The overwhelming majority of Japanese workers do not belong to a union and do not bargain through shunto, so even this partial gain reaches them only indirectly. Wages are rising. Living standards, for many households, are not.

Then there is the government's own balance sheet, which faces the tightening as a borrower rather than a beneficiary. With public debt above 230 per cent of GDP, among the highest of any advanced economy, and the Bank still gradually stepping back from the bond buying that has financed much of it, the arithmetic behind Takaichi's spending plans becomes harder with every quarter point rise.13

A currency that will not behave

The paradox has a straightforward core: a currency moves on the gap between interest rates, not their absolute level, and even after two years of increases Japan's rate sits far below the Federal Reserve's. While dollars pay so much more than yen, money keeps leaving the very currency the Bank is trying to strengthen. That would be a domestic story were Japan a smaller economy. It is not. It is the largest net creditor nation on earth,14 and its insurers, pension funds and banks are the largest foreign holders of United States government debt, with holdings of around 1.2 trillion dollars.8 For years, near zero yields at home pushed that capital abroad in search of return. As Japanese yields rise, some of it has less reason to leave, and global bond markets lose a buyer they had come to take for granted. When the Bank raised rates in December 2025, Germany's thirty year bond yield jumped to its highest level since 2011 within days, a correlation few outside currency trading desks would have predicted five years ago.14

The yen's descent has not been uninterrupted. It rallied to around 152 per dollar in late January, its strongest level of the year, before resuming a slide that carried it to fresh multi decade lows by midsummer.

Yen against the dollar, month-end closing rate, December 2025 to June 2026. Source: Yahoo Finance.

The channel that concentrates all of this is the yen carry trade, the practice of borrowing cheaply in yen to fund higher yielding bets elsewhere. Its unwind in August 2024 remains the reference case for what happens when it goes wrong. It has not repeated on that scale since, largely because the Bank has been careful to over communicate every subsequent move, but the trade is, by some measures, larger again than it was before that crash. Leveraged funds' bets against the yen reached their highest level in almost nine years in early June 2026, according to Commodity Futures Trading Commission data, even as the currency traded within sight of its weakest levels since the mid 1980s.15

Tokyo has tried to manage the currency directly rather than wait for the rate gap with the United States to close on its own. The Ministry of Finance spent an estimated 11.7 trillion yen, around 74 billion dollars, defending the yen between late April and May 2026, its largest such intervention on record.1 It bought perhaps a week of calm. By the end of June the yen had erased the gain and moved on to fresh multi decade lows.

Jesper Koll of the Monex Group has been blunt about the contradiction: Tokyo is fighting the yen's fall with intervention while leaving untouched the very rate gap that is driving it down.

Tapping the brake while keeping your right foot firmly on the accelerator.

Jesper Koll, Expert Director, Monex Group.16

With the Federal Reserve holding its own rate at 3.5 to 3.75 per cent against the Bank of Japan's 1 per cent, the gap that makes the carry trade profitable remains wide enough to keep it alive, whatever Tokyo spends defending the currency.16

What comes next

The Bank's own board is not of one mind about where this ends. Naoki Tamura, one of its more hawkish members, has argued publicly for continuing quarter point increases every few months until the policy rate reaches a neutral level of around 2 per cent.17 The Bank's internal estimate of that neutral rate spans a wide range, 1 to 2.5 per cent, and economists at EFG International think a realistic terminal rate is closer to 1.25 to 1.75 per cent, reachable by late 2026 or 2027 at the current pace.18 Elsewhere, forecasters at BNP Paribas expect the next move as early as October, pointing to resilient, AI linked corporate demand as a reason the Bank will struggle to justify standing still.9

Working against all of it is the arithmetic of Takaichi's own appointments to the board, which makes each future vote a genuine contest rather than the formality it was for most of Ueda's time in office.

In the first days of July the strains intensified rather than eased: the ten year yield pushed to around 2.8 per cent, its highest since the late 1990s, as investors fixed on the scale of the government's spending plans, while the yen, after touching a fresh forty year low around 1 July, rebounded to around 161 before slipping back toward 162 as speculation mounted that Tokyo might intervene again.

The Bank meets again on 30 and 31 July, the first meeting Ueda is expected to attend since his hospitalisation. An inflation problem that is now largely imported through the price of oil, a currency that direct intervention has failed to defend, and a government whose spending plans and appointment powers both pull gently against the Bank's own instincts will all be in the room. Any of the three could end up deciding the outcome.

The stakes

Strip away the daily currency moves and the underlying experiment is this. Japan is trying to withdraw the most extensive monetary stimulus any large economy has ever run, without a recession, without a fiscal crisis, and without a government that particularly wants it to succeed on the Bank's own terms. No other G7 country has attempted this from Japan's starting position, a shrinking population, the developed world's heaviest public debt load, and three decades of habits built around the assumption that rates would never meaningfully rise. So far there has been no recession and no second carry trade crash. What has not yet arrived is the thing normalisation was meant to deliver, a currency that behaves like other major currencies and a government whose deficits are disciplined by the cost of financing them. Until one of those two things changes, Japan's rate rises will keep arriving without quite producing their advertised effect.

Footnotes

  1. CNBC, Japan spent $74 billion propping up the yen. Investors say the real battle is with the Fed (opens in a new tab), 1st July 2026. ↩ ↩2

  2. CNBC, Bank of Japan hikes rates to 1%, highest since 1995, as yen and inflation worries take hold (opens in a new tab), 16th June 2026. ↩ ↩2

  3. ABN AMRO, Japan: The Land of the Rising Yields (opens in a new tab), 1st July 2026. ↩

  4. CNBC, Nikkei sees worst day since 1987 with Japan stocks in bear market; South Korea's Kospi briefly halts trading (opens in a new tab), 5th August 2024. ↩

  5. CNBC, Japan inflation falls below BOJ's 2% target for first time since March 2022 (opens in a new tab), 19th February 2026. ↩

  6. Bank of Japan, Change in the Guideline for Money Market Operations (opens in a new tab), 16th June 2026. ↩

  7. Al Jazeera, Why Japan's economic plans are sending jitters through global markets (opens in a new tab), 27th January 2026. ↩

  8. CNBC, Bond sell off accelerates as Trump ramps up tariff threats (opens in a new tab), 25th January 2026. ↩ ↩2

  9. Reuters, BOJ's slow, dovish revamp casts doubt over long term rate hike plans (opens in a new tab), 1st July 2026. ↩ ↩2

  10. CNBC, Japan's megabanks post record profits, but analysts warn growth may slow as risks mount (opens in a new tab), 21st May 2026. ↩

  11. The Japan Times, Japan's key labor union wins wage hike topping 5% for third year (opens in a new tab), 23rd March 2026. ↩

  12. ISVD, 5.26% Wage Hike, Fourth Straight Year of Negative Real Wages — How Japan's Triple Squeeze Works (opens in a new tab), 5th May 2026. ↩

  13. CNBC, Bank of Japan raises benchmark rates to highest in 30 years, lifting 10 year JGB yield past 2% (opens in a new tab), 19th December 2025. ↩

  14. Euronews, Bank of Japan hikes interest rates: Is a global bond crisis looming? (opens in a new tab), 19th December 2025. ↩ ↩2

  15. The Japan Times, Yen short bets jump to nine-year high as carry trade revives (opens in a new tab), 15th June 2026. ↩

  16. CNBC, Japan may have fired its yen bazooka twice, but markets are testing Tokyo’s resolve (opens in a new tab), 7th May 2026. ↩ ↩2

  17. Trading Economics, BoJ Hawk Tamura Calls for Rate Hike Every Few Months (opens in a new tab), citing remarks by Bank of Japan board member Naoki Tamura, 25th June 2026. ↩

  18. EFG International, Bank of Japan raises rates to 30 year high (opens in a new tab), 23rd December 2025. ↩