The April 2026 Consumer Price Index showed the headline index rising 1.4% year-on-year (YoY), slowing from 1.5% in the prior month, while core CPI (headline excluding fresh food) also slowed markedly to 1.4% YoY from 1.8% the previous month. Core‑core CPI (headline excluding fresh food and energy) fell to 1.9% YoY from 2.4% in the prior month, yet it remains above both the headline and core CPI. The BOJ (Bank of Japan)'s Corporate Goods Price Index (CGPI) recorded a sharp month‑on‑month +3.0% surge, making clear that upstream price pressures are building and awaiting pass‑through to downstream prices. Against the BOJ's 2% price stability target, the tug‑of‑war between a slowing underlying inflation trend and rising upstream costs continues.
According to the Statistics Bureau of Japan (MIC), the headline CPI stood at 113.0 (2020 base) in April 2026, up 0.3 points from 112.7 in the prior month, but only +1.4% YoY, a 0.1 percentage point slowdown from the previous month (1.5%). Core CPI also decelerated sharply to +1.4% YoY from 1.8% previously. The concurrent slowdown in both headline and core indicators continues the deceleration trend observed since November 2025.
Core‑core CPI fell to +1.9% YoY from +2.4% in the prior month, clarifying a downshift that peaked at +2.6% in January 2026. Notably, core‑core CPI exceeds headline and core CPI by 0.5 percentage points. This divergence suggests that price increases for underlying goods and services excluding energy and fresh food are relatively firm, while downward pressure from energy prices is suppressing headline and core measures.
A time‑series view of the three measures shows a phase in which headline, core and core‑core hovered around the 3% range from May to November 2025, before a clear deceleration from December 2025 onward. Between January and April 2026, core CPI moved 2.0% → 1.6% → 1.8% → 1.4%, showing a downward tendency amid fluctuations, while core‑core CPI recorded a steady deceleration of 2.6% → 2.5% → 2.4% → 1.9%. These movements indicate that the high‑inflation episode in late 2025 has subsided and inflationary pressures may be structurally weakening.
Relative to the BOJ (Bank of Japan)'s 2% YoY price stability target, core CPI in April 2026 at 1.4% is 0.6 percentage points below the target. This gap has widened from the prior month (core CPI 1.8%, gap -0.2 percentage points), increasing the distance to target. Core‑core CPI at 1.9% is 0.1 percentage points below the target, a reversal from the prior month (2.4%, +0.4 percentage points above target) into target non‑achievement.
From December 2025 to January 2026, core CPI held above the target at 2.4% → 2.0%, but since February it has remained below—1.6% → 1.8% → 1.4%. This trajectory suggests the inflation momentum seen in late 2025 has faded, making sustained achievement of 2% more difficult.
For the BOJ, core CPI undershooting the target weakens the case for policy normalization. In particular, core‑core CPI falling below 2% implies that underlying inflationary pressure, excluding transitory factors, is easing—potentially diminishing the justification for further rate hikes. However, given the sharp rise in the CGPI and the behavior of the trimmed mean discussed below, it is possible that delayed pass‑through of upstream costs is temporarily depressing consumer inflation. Careful monitoring of near‑term developments is therefore necessary.
Among the BOJ's indicators of underlying inflation, the trimmed mean (10% trimmed weighted average) recorded +2.5% YoY as of March 2026. That level exceeds the core CPI for the same month (1.8%) by 0.7 percentage points, indicating that a measure of the underlying trend that strips out temporary swings in energy and food is rising faster than headline consumer prices.
The trimmed mean moved roughly around 3% from April–August 2025 (2.9% → 2.9% → 3.0% → 2.8% → 3.0%), but decelerated from September 2025 onward (2.8% → 2.8% → 2.7% → 2.7% → 2.3% → 2.2% → 2.5%). In particular, January 2026 (2.3%) and February 2026 (2.2%) were the lowest readings since 2025, suggesting a weakening of underlying inflationary pressure. The rebound to 2.5% in March may represent a temporary bounce, yet the clear decline from the 3% range in late 2025 remains evident.
The weighted median stood at 1.7% as of March 2026, which is 0.8 percentage points below the trimmed mean (2.5%). This gap implies that a subset of items with large upward moves is pulling up the mean, while price increases clustered around the median remain relatively subdued. The weighted median bottomed at 1.6% in September 2025 and then moved 1.6% → 1.9% → 1.9% → 1.8% → 1.6% → 1.7% → 1.7%, mirroring the trimmed mean's decline from the high late‑2025 levels.
The 1.1 percentage point gap between core CPI (April: 1.4%) and the trimmed mean (March: 2.5%) suggests that falling energy prices may have significantly depressed core CPI. Because core CPI excludes fresh food but includes energy, fluctuations in energy prices have a direct impact. The trimmed mean, by trimming extreme movements, downweights abrupt energy price declines, thereby reflecting more clearly the continued firm pace of underlying goods and services prices. This structural divergence implies that some underlying inflationary pressure persists beneath the surface slowdown.
BOJ statistics show the CGPI at 132.8 (2020 base) in April 2026, up from 129.8 in March, a 3.0‑point rise that amounted to a month‑on‑month +2.3% jump. This increase is the largest over the last 12 months and marks a sharp shift from the gentle increases seen in October (+0.6 points) and November (+0.6 points) 2025, highlighting the sudden emergence of strong upstream price pressures.
Looking at CGPI over time, it traded around the 126–128 range from April 2025 (126.6) through December 2025 (126.4), then began rising in January 2026 (128.5), remained 128.5 in February, rose to 129.8 in March, and surged to 132.8 in April. The cumulative 4.3‑point rise over three months (about 3.3%) likely reflects sharp increases in raw material prices and import costs.
By contrast, headline CPI was only 113.0 in April (from 112.7), a mere 0.3‑point increase month‑on‑month (+0.3%). Compared with CGPI's month‑on‑month +2.3%, it is clear that upstream price increases have not been fully passed through to consumer prices. This asymmetry suggests firms are absorbing upstream cost increases rather than fully transferring them to consumers.
Considering pass‑through lags, April 2026's CGPI surge could transmit to the CPI over the coming months. Historical patterns often show a 2–3 month lag from CGPI rises to CPI. Therefore, the risk of CPI re‑acceleration is elevated around June–July 2026. Nonetheless, given firms' earnings considerations and demand conditions discussed below, their ability to pass through costs fully is limited, and full pass‑through appears unlikely.
The Service Producer Price Index (SPPI) for business‑to‑business services stood at 113.5 in March 2026, up from 112.1 the prior month, a 1.4‑point increase (month‑on‑month +1.2%). This is a notable rise since October 2025 (+0.8 points), indicating that upward pressure is also strengthening in the services sector. The concurrent increases in goods (CGPI) and services (SPPI) upstream prices point to broad‑based cost pressure.
METI's seasonally adjusted Industrial Production Index was 102.2 as of February 2025, up from 99.9 the prior month (+2.3% month‑on‑month). This rebound followed a −1.1% month‑on‑month decline in January 2025, signaling a recovery in production activity. However, the index remains below the October 2024 peak of 103.0, indicating production is trending sideways.
The Cabinet Office's Coincident Index (CI) was 116.5 as of March 2026, up from 116.2 the prior month (+0.3 points). This small recovery followed a 1.7‑point decline from 117.9 in January 2026 to 116.2 in February, leaving the current economic assessment in a broadly flat range. The Leading Index was 114.5 in March 2026, up from 113.2 in February (+1.3 points), continuing an upward trend since January 2025 (107.7), which could signal economic recovery in the coming months.
The Lagging Index was 113.4 in March 2026, up from 112.9 in February (+0.5 points), maintaining a modest upward trend. A stable rise in the lagging index suggests past expansions are feeding through to employment and income conditions.
The flat behavior of CI and the slowdown in consumer prices are consistent: weak demand‑pull inflation reduces firms' ability to pass on costs. Meanwhile, improvement in the Leading Index suggests the possibility of renewed demand and a risk of re‑emergent price pressures.
BOJ Tankan (Q1 2026) shows the large‑manufacturing business conditions DI at 17.0 (the difference between "favorable" and "unfavorable" responses, in percentage points), up 2.0 points from the previous survey (Q4 2025: 15.0). The outlook DI is 15.0, 2.0 points below the current DI (17.0), indicating firms remain cautious about the future. Large non‑manufacturing business conditions DI rose to 36.0 from 34.0 (+2.0 points), while the outlook DI is 28.0, 8.0 points below the current reading.
Mid‑sized manufacturing DI is 16.0, unchanged from the prior survey, while small manufacturing DI improved to 7.0 from 6.0 (+1.0 point). The fact that DI readings are positive across firm sizes suggests corporate profit conditions are holding up.
The assumed USD/JPY exchange rate used by firms shifted to a weaker yen: 150.10 for all sizes and industries, versus 147.06 in the previous survey (a 3.04 yen depreciation). Large manufacturing firms assume USD/JPY at 148.91, up from 146.48 (a 2.43 yen depreciation). This weaker yen assumption implies firms are pricing in higher import costs, consistent with the CGPI surge in April (month‑on‑month +2.3%).
Improving business sentiment may widen firms' scope for price pass‑through. However, the fact that outlook DIs are below current DIs suggests firms are cautious about future demand and may hesitate to implement aggressive price increases. This caution likely contributes to CPI's muted response despite the CGPI surge.
According to the Ministry of Finance trade statistics, imports in December 2025 were ¥10,312.9 billion, up ¥910.0 billion (+9.7%) from ¥9,402.9 billion in the prior month. This sharp increase in imports may have been a leading indicator of the CGPI surge in April 2026. In the cost‑push chain from imports → CGPI → CPI, the December 2025 import rise can be interpreted as transmitting to CGPI increases over a 2–3 month lag, reflected in CGPI's 128.5 → 128.5 → 129.8 → 132.8 pattern from February to April 2026.
The trade balance recorded a surplus of ¥94.8 billion in December 2025, narrower than the previous month's ¥306.0 billion surplus. After a run of deficits from May to October 2025, the balance turned to surplus in November, but the surplus narrowed in December. Imports have been rising faster than exports (exports ¥10,407.7 billion, month‑on‑month +7.2%), suggesting firm domestic demand alongside persistent import cost pressures.
METI retail trade statistics show retail sales of ¥12,728.0 billion in January 2025, up +4.4% YoY—a high rate since February 2024 (+4.7%)—indicating resilient household consumption. The year‑on‑year growth, after weakness in September (+0.7%) and October (+1.3%) 2024, accelerated through November (+2.8%), December (+3.5%) and January 2025 (+4.4%), suggesting a possible resurgence of demand‑pull inflation.
Integrating demand and supply: supply‑side pressures have intensified via rising import costs → CGPI surge, while demand‑side indicators such as accelerating retail sales point to growing demand pressure. Despite these dual pressures, CPI has remained subdued, implying firms are compressing margins and absorbing costs. However, this is likely unsustainable, raising the probability of greater pass‑through to CPI in coming months.
TOPIX fell from 3,777.02 on April 20, 2026 to 3,727.21 on April 30, 2026, a decline of 49.81 points (−1.3%). It then rebounded sharply to 3,840.49 on May 7 (+3.0%) and rose to 3,919.48 on May 13 before falling again to 3,791.65 on May 20. These swings suggest market participants are uncertain about the outlook for prices, monetary policy, and corporate earnings.
The late‑April equity decline may reflect concern that the CPI slowdown (headline and core both 1.4%) delays policy normalization and weakens corporate profit prospects. The rapid rebound in early May likely reflected expectations that the CGPI surge would lead to CPI re‑acceleration and thus improve earnings via price pass‑through. The subsequent mid‑May decline appears tied to renewed uncertainty about pass‑through and external economic risks.
Overall, markets may be reacting more to leading indicators—upstream price spikes and improving demand measures—than to the surface CPI slowdown. TOPIX movements suggest investors are beginning to price in the risk of CPI re‑acceleration in the second half of 2026.
Summing up April 2026 price developments, multiple opposing dynamics are at work behind the surface CPI slowdown. First, decelerations in core CPI (1.4%) and core‑core CPI (1.9%) reflect falling energy prices and a waning underlying momentum. The gap with the trimmed mean (March: 2.5%) points to transitory factors, but the trimmed mean itself has fallen from the 3% range in late 2025, suggesting a structural weakening of underlying inflationary pressure.
Second, CGPI's sharp rise (April: month‑on‑month +2.3%) and SPPI's increase (March: month‑on‑month +1.2%) indicate strong upstream price pressures. The December 2025 import surge (month‑on‑month +9.7%) appears to be a source of these pressures, and CGPI's rise is likely to transmit to CPI over the next 2–3 months. Firms' assumed exchange‑rate outlooks shifting toward a weaker yen also point to continued import cost pressures.
Third, demand remains relatively firm. Retail sales growth of +4.4% YoY (January 2025) suggests household consumption is recovering, and the rising Leading Index supports the potential for renewed demand‑driven price pressure.
For BOJ policy, core CPI's failure to reach the target (1.4%, gap −0.6 points) weakens the case for further tightening, while the CGPI surge and improving demand indicators raise the risk of CPI re‑acceleration. The BOJ should avoid being misled by the surface CPI slowdown and instead comprehensively assess the progress of upstream cost pass‑through, the trimmed mean trajectory, and evolving demand conditions. At present, it is difficult to conclude that the underlying trend will sustainably achieve the 2% target; maintaining the current policy stance appears appropriate.
For households, the CPI slowdown may temporarily improve real purchasing power. However, if upstream price pressures transmit to CPI, that improvement could be reversed and real incomes pressed again. The interplay between wage growth and CPI inflation will be a key determinant of household real purchasing power going forward.
Key points to monitor into the second half of 2026 are: (1) timing and magnitude of CGPI pass‑through to CPI, (2) the trend in the trimmed mean (persistence of the underlying trend), (3) the strength of retail sales growth as an indicator of demand, and (4) firms' price‑pass‑through behavior (alignment between Tankan outlook DIs and actual pass‑through). The interaction of these factors will shape price developments in the latter half of 2026.
core CPI: Consumer Price Index excluding fresh food. By removing items that fluctuate with weather and seasonality, it captures the underlying trend in consumer prices. Used by the BOJ in assessing its 2% price stability objective.
core‑core CPI: Consumer Price Index excluding fresh food and energy. By also excluding energy price fluctuations, it measures more persistent inflationary pressure.
Corporate Goods Price Index (CGPI): An index of prices for goods traded between firms, positioned upstream of the CPI. CGPI reflects trends in raw material and intermediate goods prices; rises in CGPI tend to transmit to CPI with a lag of several months.
trimmed mean (刈込平均値): A weighted average of CPI item‑level inflation rates after excluding the upper and lower 10% of the distribution. It removes extreme movements—such as volatile energy and food—to extract the underlying inflation trend and is published by the BOJ.
price‑pass‑through: The process by which firms reflect increases in costs (raw materials, wages, etc.) in sales prices. It describes how upstream price rises (e.g., CGPI) transmit to downstream consumer prices (CPI).
Coincident and related indices (CI): Composite indices used to assess economic conditions. The Leading Index forecasts near‑term economic changes, the Coincident Index reflects the current state, and the Lagging Index confirms past developments.
Service Producer Price Index (SPPI): An index measuring the price level of services traded between firms. It complements CGPI for goods and reflects upstream price dynamics in the services sector.
business conditions DI (Tankan DI): An index from the BOJ's Tankan survey indicating corporate sentiment. It equals the percentage of firms reporting that conditions are "favorable" minus the percentage reporting "unfavorable"; positive values indicate improving sentiment.
demand‑pull inflation: Inflation arising when aggregate demand outpaces supply, pushing up prices. Driven by stronger consumption or investment.
cost‑push inflation: Inflation caused by increases in production costs such as raw materials or wages being passed on to prices. Often driven by rising import prices or wage growth.
This column was automatically generated by AI integrating Cabinet Office GDP data, Bank of Japan statistics, e-Stat public statistics, and market data as a macroeconomic analysis resource. This is not a recommendation to invest in any specific security. Please make investment decisions at your own responsibility and consult professionals as needed.