Japan has recorded its strongest nominal wage growth since the late 1990s, while its economy is expanding faster than previously estimated. For a country that spent decades battling deflation with every tool available to its central bank, this combination of data points represents a significant turning point.

Swap markets are now pricing in roughly a 98% probability that the Bank of Japan (BoJ) will raise its policy rate by 25 basis points to 1.25% at its September 17-18 meeting. If this occurs, it would mark Japan's highest policy rate since the mid-1990s, continuing a tightening cycle that already lifted rates to 1% in June. The tightening cycle began in March 2024, when the BoJ ended eight years of negative interest rates and abandoned its yield curve control framework, marking the first rate increase since 2007.

The Numbers Behind the Confidence

Two key data releases on September 8 reinforced the case for further tightening.

First, the Cabinet Office revised second-quarter GDP growth upward to an annualized rate of 1.4%, from an initial estimate of 1.1%. On a quarter-on-quarter basis, growth was 0.4% rather than the previously reported 0.3%. The revision was driven partly by a smaller-than-expected decline in capital spending, which came in at negative 0.9% instead of the earlier reading of negative 1.2%. Net exports also contributed 0.5 percentage points to overall growth.

Second, the Ministry of Health, Labour and Welfare reported that real wages rose 2.4% year-on-year in July. This was the largest increase since May 2021 and marked the seventh consecutive month of gains. Nominal cash earnings climbed 4.7% year-on-year, the fastest pace since January 1997.

Why Wages Matter More Than GDP

This year's shunto spring wage negotiations delivered average pay increases exceeding 5% at major firms for the third consecutive year.

Private consumption, however, remained flat in the second quarter, representing the soft spot in the data. Wages are rising, but consumers are not yet spending more. Part of the explanation is that real income gains have only recently turned positive after a prolonged period in which inflation outpaced pay. Whether household spending begins to catch up with incomes will be a key signal for the BoJ as it weighs the pace of further tightening, and upcoming monthly consumption and inflation releases will help clarify the picture.

A Broader Shift After Decades of Easy Money

After raising rates to 1% in June, a level not seen since 1995, the BoJ is now positioned to push further.

Several forces are reinforcing the inflation backdrop. A weaker yen has made imports more expensive, particularly energy commodities, while geopolitical tensions in the Middle East have added upward pressure on oil and gas costs.

For global markets, a more hawkish BoJ carries significant implications. Japan has been the world's largest creditor nation, and its institutional investors hold enormous portfolios of foreign bonds. When domestic yields rise, the incentive to repatriate capital strengthens. When the BoJ last surprised markets with a policy shift, in late 2022 when it widened its yield curve control band, the ripple effects were felt across US Treasury markets and global currency pairs within hours.

The interest rate differential between Japan and the US would continue to narrow, a dynamic that has already contributed to periodic unwinding of yen carry trades this year.