Indonesia Commodity Stocks Plummet as Government Unveils Aggressive Mineral Royalty Hike

JAKARTA, Investortrust.id — The Indonesian government’s aggressive hunt for fiscal revenue has sent shockwaves through global commodity markets, as a proposed hike in mineral royalties triggered a massive "auto-reject" sell-off across Jakarta’s mining board.

Indonesia is facing a "fiscal squeeze" in 2026. With the ambitious Free Nutritious Meal (MBG) program and the massive capitalization of the new Danantara sovereign wealth fund pressuring the state budget (APBN), the government is pulling the easiest political lever: mining royalties.

By rerating the state’s take on commodities currently buoyed by geopolitical premiums—such as gold (+62% YoY) and copper (+47%)—the administration is clawing back corporate windfalls to shore up national accounts. However, the timing is brutal for miners already battling a global oversupply and narrowing margins.

A Bloodbath on the IDX

The market reaction was swift and violent. On Friday, May 8, 2026, the Jakarta Composite Index (IHSG) plunged 204.92 points to 6,969.39. The Basic Materials sector bore the brunt of the panic, collapsing 7.8%.

Major players hit the "Auto-Reject Lower" (ARB) limit: PT Timah Tbk (TINS) plummeted 14.88%, Vale Indonesia (INCO) dropped 13.89%, and Merdeka Copper Gold (MDKA) fell 13.13%. Investors are effectively pricing in a structural shift where the state, rather than shareholders, captures the "scarcity rent" of Indonesia’s mineral wealth.

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The New Royalty Framework: Who Gets Hit?

The proposed fiscal overhaul targets a significant recalibration of the state's share in mineral wealth, shifting from static or narrow ranges to an aggressive sliding scale indexed to benchmark mineral prices (HMA).

Under this new framework, tin faces the most punitive adjustment with its royalty range doubling from a 3–10% bracket to a 5–20% scale, while copper concentrates are set to rise to a 9–13% range and copper cathodes will climb into a 7–10% bracket.

Gold and silver follow a similar upward trajectory, with gold royalties leaping from a 7–16% range to a 14–20% scale and silver transitioning from a flat 5% rate to a progressive 5–8% model.

Even for nickel, where the headline percentage remains within the 14–19% range, the government plans to adjust the underlying benchmark price intervals to effectively increase the tax burden on producers. This entire suite of changes is slated for implementation by June 2026, marking a decisive pivot toward capturing geopolitical price premiums for the national budget.

Industry Pushback and Regulatory Risk

The mining lobby is sounding the alarm on "regulatory fatigue." Edi Permadi, a professional expert at the National Resilience Institute (Lemhanas), noted that this is the second major fiscal adjustment in just over a year.

"Adjusting royalties so frequently creates massive uncertainty for long-term investors," Edi warned. He emphasized that while the government views this as a "windfall capture," miners are struggling with high energy costs and a global nickel glut that has already seen the sector contract by 2.14% in Q1 2026.

Notably, coal—the largest contributor to mining revenue—remains untouched in this draft. Analysts suggest this reflects the political clout of domestic coal "overlords" compared to the more globalized mineral players.

For institutional investors, the picture remains clear: while Indonesia’s minerals are essential for the global energy transition, the cost of doing business in the archipelago just got significantly more expensive.