IMF Warns BOJ May Need Faster Tightening as Inflation Risks Mount

The International Monetary Fund has signaled that the Bank of Japan may need to accelerate its pace of interest rate increases if inflation runs hotter than expected, a warning that reinforces market expectations of a December hike and keeps the yen under scrutiny.

Krishna Srinivasan, director of the IMF’s Asia and Pacific Department, told Reuters that the BOJ is “doing the right thing” by normalizing monetary policy. But he cautioned that data dependency could force faster action. “If inflation rises faster than expected, you have to start tightening faster because you don’t want inflation expectations to get un-anchored,” Srinivasan said in an interview on Friday.

The remarks came ahead of the BOJ’s policy meeting later this month, when the central bank could keep rates steady while dropping hawkish hints that would reinforce dominant market expectations of a December rate increase.

BOJ Governor Kazuo Ueda, attending the IMF annual meetings in Bangkok, said on Friday the central bank will focus on anchoring underlying inflation around its 2% target and will not tolerate any overshoot, stressing its resolve to continue raising rates.

**Inflation Pressures from Weak Yen and Global Factors**

For Japan, a weak yen adds to inflationary pressures by boosting the cost of raw material imports. Such mounting price pressures prodded the BOJ to raise rates to a 31-year high of 1.25% in September, following a hike in June. Many analysts expect another rate increase by year-end.

Inflationary pressures from the Middle East conflict and brisk AI-related demand were among key themes discussed by policymakers at this week’s IMF meetings.

Japan also conducted a rare, coordinated intervention with the United States on July 31 to prevent the yen’s slide to near 40-year lows from destabilizing financial markets.

In staff analysis included in its report on Asia’s economy, the IMF said a big portion of yen moves since mid-2025 had little to do with fundamental factors such as yield differentials, and instead co-moved with speculative positions in yen futures.

Srinivasan defended Japan’s commitment to a market-determined exchange rate. “Japan has a deep foreign exchange market, so as a first line of defense, they have allowed the exchange rate to move,” he said. “Bottom line, I would say that the Japanese authorities are fully committed to a freely floating exchange rate. I’ve had many discussions with them. So I don’t doubt that at all.”

**Fiscal Framework Needed to Ease Market Concerns**

Rising global bond yields have drawn attention at this week’s IMF meetings as debt in advanced economies, including Japan, expanded after years of heavy spending. Markets worry that Japan may add to its already huge debt pile with the administration’s big spending plans and a two-year cut to the consumption tax from April next year.

Srinivasan noted that Japan has in fact seen fiscal consolidation proceed more than any other G7 country since the pandemic, due in part to rising tax revenues. However, he said markets remain concerned about the uncertainty of how Japan would pay for fresh spending and tax-cut plans. “Japan also would benefit from having a medium-term fiscal framework,” he said.

The IMF’s warning on faster tightening, combined with fiscal uncertainty, keeps the yen and Japanese government bond yields sensitive to any shift in BOJ communication. The central bank’s next policy decision is expected later this month, with markets watching closely for signs of the timing and pace of further rate increases.