Base Effect Narrows Indonesia's Monetary Easing Room as Inflationary Pressures Mount

Economists at Kenanga Investment Bank have highlighted a critical constraint on Indonesia’s ability to ease monetary policy in 2026. The primary culprit: a combination of low base effect from year-on-year comparisons and anticipated demand surge during Ramadan. These twin factors are expected to keep inflation elevated in the near term, leaving policymakers with fewer levers to cut rates.

The Base Effect Conundrum

The base effect—the mathematical artifact of comparing current prices to unusually low prices from the previous year—creates a statistical headwind for the central bank. When last year’s baseline was depressed, this year’s figures naturally appear higher even without genuine price growth. Kenanga’s analysis emphasizes that this base effect, combined with traditional Ramadan consumption patterns, will sustain inflationary pressures through the first quarter of 2026. Only from April onwards does the bank expect relief as these temporary factors fade.

Inflation Forecasts and Policy Implications

Kenanga maintains its 2026 Consumer Price Index projection at 2.5%, consistent with previous guidance, while revising the 2025 forecast to 1.9%. These figures reveal the bank’s expectation of near-term stickiness in inflation before gradual moderation materializes. Such persistent price pressures directly translate into diminished space for the central bank to pursue rate cuts—a key concern for growth-oriented policymakers.

Multiple Headwinds Constraining Policy Options

Beyond the base effect and seasonal demand dynamics, broader macroeconomic challenges are compounding market pressures. Geopolitical tensions continue to inject uncertainty into global markets, while the weakening Indonesian rupiah amplifies import costs and domestic price indices. Compounding these external shocks are domestic vulnerabilities: ongoing questions surrounding central bank independence, concerns about fiscal policy credibility, and regulatory warnings from MSCI regarding data transparency and trading violations. Together, these factors have created an environment where aggressive monetary easing is neither advisable nor feasible, leaving Indonesia’s inflation-fighting capacity tethered by external and internal constraints.