Base Effect and Ramadan Demand Squeeze Indonesia's Rate Cut Options in 2026

Economists at Kenanga Investment Bank have flagged a significant challenge for Indonesia’s monetary policy this year. The base effect—essentially the mathematical comparison between current prices and significantly lower prices from the previous year—combined with anticipated seasonal spending during Ramadan, is expected to sustain elevated inflation readings in the coming months. The analysis suggests that while price trajectory may begin to normalize starting in April, the immediate outlook remains constrained by these competing forces.

Year-on-Year Base Effect Amplifies Near-Term Inflation Readings

The low base effect from 2025 creates a statistical headwind for inflation metrics in early 2026. When comparing this year’s prices to last year’s relatively depressed levels, the simple mathematical comparison inflates the reported inflation rate even if actual price increases moderate. Kenanga maintains its forecast for the Consumer Price Index at 2.5% for 2026, while 2025’s reading came in at 1.9%. This base effect phenomenon, while temporary in nature, significantly impacts the central bank’s ability to ease monetary policy during this period, as officials must account for both real price pressures and statistical distortions.

Seasonal Spending and External Headwinds Narrow Monetary Policy Space

Beyond the base effect, Ramadan creates an identifiable demand shock. During the Islamic holy month, consumption patterns shift dramatically as families increase spending on food, goods, and services. This seasonal surge in demand can exert meaningful upward pressure on prices precisely when inflation readings are already elevated by year-on-year statistical comparisons.

The central bank faces additional constraints from external factors. The weakening of the Indonesian rupiah amplifies import costs and imported inflation, while escalating geopolitical tensions inject uncertainty into global commodity and energy markets. These external pressures further limit the room for rate cuts, as maintaining higher interest rates becomes necessary to stabilize the currency and control inflation expectations.

Domestic Concerns and Market Risks Add to Policy Constraints

Beyond economic data, structural concerns are intensifying market pressures. Questions surrounding central bank independence have surfaced, raising doubts about the consistency of monetary policy. Simultaneously, credibility issues surrounding fiscal policy create additional uncertainty for investors and markets. International monitoring has also intensified, with MSCI issuing warnings regarding data transparency standards and alleged trading violations, which have contributed to volatile market dynamics.

These overlapping pressures—the base effect, seasonal demand patterns, currency depreciation, and institutional concerns—collectively erode the central bank’s flexibility. The prospect of significant monetary easing this year appears limited, with policymakers forced to balance inflation control against economic growth objectives in an increasingly complex environment.