Why Does an Oil Price Shock Halfway Around the World Move Your Rupiah?
8 min readUpdated 22 August 2026
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8 min readUpdated 22 August 2026
In June 2026, a war being fought in the Middle East, thousands of kilometers from Jakarta, helped push the rupiah to Rp 18,100 per US dollar, its weakest level on record. No Indonesian company failed. No local bank collapsed. The trigger was a jump in the price of oil on the other side of the world.
That connection between an oil price shock and its rupiah impact is not a coincidence and it is not rare. It happens every time global oil prices move sharply, because of one basic fact about Indonesia's economy: the country buys far more oil than it produces. Here is exactly how that link works, and where it stands today.
Indonesia used to be an oil exporter. It is not anymore. Domestic crude production now sits at roughly 570,000 to 610,000 barrels a day, while the country actually uses somewhere between 1.4 million and 1.7 million barrels a day of oil and refined fuel, according to US Energy Information Administration data and 2026 industry reporting. That gap, often around 900,000 barrels a day or more, has to come from somewhere else. It comes from imports.
In 2025 alone, Indonesia imported 55.33 million tons of oil and gas worth US$32.77 billion, according to Statistics Indonesia (BPS) data reported by Databoks, mostly from Singapore and Malaysia. That is not a one-year blip. It is the country's structural position: a net oil importer, meaning it buys more oil from abroad than it sells.
Oil is priced and traded in US dollars almost everywhere in the world, no matter which country is buying it. So when Pertamina, Indonesia's state energy company, buys crude or refined fuel from an overseas supplier, it has to pay in dollars, not rupiah.
Here is the chain reaction:
None of this requires anything to go wrong inside Indonesia's own economy. The exchange rate can move purely because of a price set on a commodity exchange somewhere else.
This mechanism is not theoretical. It played out in real time in 2026, after a US-Israel military campaign against Iran escalated from late February, threatening the Strait of Hormuz, the narrow waterway that around 20% of the world's seaborne oil trade passes through, according to Al Jazeera's reporting on International Energy Agency (IEA) warnings.
| Date | Brent crude oil price | What was happening |
|---|---|---|
| Mid-Jan 2026 | About $66/barrel | Before the war, only a small "war premium" of about $4 priced in (BloombergNEF) |
| 15 Mar 2026 | $103.90/barrel | Conflict escalates into open war, a 43% jump in 16 days (Databoks/Katadata) |
| 1 Jun 2026 | $95.05/barrel | Near the same window the rupiah hit its record low |
| 2 Jul 2026 | Below $71/barrel | Ceasefire hopes send oil back toward pre-war levels (Al Jazeera) |
| 8 Jul 2026 | Spikes again | Renewed US strikes on Iran reverse the drop (Al Jazeera) |
| 7 Aug 2026 | $82.15/barrel | Current level: down from June's peak, still 23.37% above a year ago (Forbes Advisor/Trading Economics) |
Sources: BloombergNEF, Databoks/Katadata's "16 days of the US-Israel war against Iran" tracker, and Al Jazeera's live coverage of the conflict's effect on oil, all retrieved 8 August 2026, plus Forbes Advisor's daily oil price report for the current figure.
The same week Brent traded near $95 a barrel, the rupiah broke through Rp 18,100 per US dollar on 8 June 2026, its weakest level ever recorded, forcing Bank Indonesia into an off-cycle emergency rate hike to 5.50% on 9 June and a further scheduled hike to 5.75% on 18 June, a move we covered in detail in our piece on the Fed, BI and USD/IDR.
You do not have to take the mechanism on faith. Indonesia's own trade data shows the oil bill widening in exactly the months oil prices spiked. According to BPS data reported by CNBC Indonesia and Kompas, Indonesia's oil and gas (migas) trade balance ran a deficit of US$3.76 billion in May 2026 and US$3.49 billion in June 2026, even while the country's non-oil trade stayed comfortably in surplus (US$3.04 billion in June alone).
Across the first half of 2026, Indonesia's overall trade balance still managed a US$3.58 billion surplus, but only because a US$19.35 billion non-oil surplus covered over a US$15.77 billion oil and gas deficit. Strip oil and gas out of the picture, and Indonesia's trade position looks completely different. Put it back in, and the size of the dollar hole oil imports create becomes obvious.
Here is a detail that surprises a lot of people: the price of Pertalite, Indonesia's most widely used subsidized fuel, did not move during any of this. It has stayed at Rp 10,000 a liter through 2026, with the government guaranteeing that price through December, funded from the fiscal budget, according to Antara News and Tempo reporting.
Pertamina's non-subsidized Pertamax did move, rising during the worst of the June price spike, then falling from Rp 16,250 to Rp 15,950 a liter in the Jakarta area from 1 August 2026 as global crude cooled, per Databoks and Jakarta Globe reporting.
So the shock at the pump was muted for most drivers. But muting it at the pump does not mute it in the trade account. Pertamina and the government still had to find the same extra dollars to buy the oil, whatever price they charged domestically. That cost shows up in the wider budget and in the country's overall dollar demand, which is the channel that reaches the exchange rate, and from there, everyone holding rupiah, whether or not they ever noticed a change at the gas station.
As of early August 2026, both sides of this story have cooled from their worst points but have not gone back to where they started. Brent crude sits around $82 a barrel, well below June's roughly $95 peak, but still 23.37% higher than the same time last year. USD/IDR was trading around Rp 17,908 to Rp 17,990 in the first week of August 2026, according to Investing.com and Wise data, an improvement from June's Rp 18,100 record low, but still roughly 7% weaker than where the rupiah started 2026.
The underlying conflict has not been resolved. A Pakistan-mediated ceasefire and a June memorandum of understanding briefly calmed things down, but fighting resumed in July 2026, and a durable settlement over Iran's nuclear program, the Strait of Hormuz and sanctions remains unsettled, per Britannica's and the Council on Foreign Relations' tracking of the conflict. Neither oil prices nor the rupiah have had a clean, lasting resolution to point to. They have had a partial retreat from the worst moment, with the structural exposure, Indonesia's own gap between how much oil it produces and how much it uses, still fully in place underneath.
If part of your portfolio is priced in rupiah, whether that is Indonesian stocks, bonds or just cash, an oil price shock somewhere else in the world is not background noise. It is one of the more direct, traceable paths by which international events change what your money is worth at home. You do not need to predict the next geopolitical event to use that fact. You just need to know the channel exists, so a sudden rupiah move does not look random when it happens.
NetWort's Macro Context page tracks the rupiah exchange rate, Bank Indonesia's benchmark rate and inflation together in one place, so you can see at a glance whether the currency is moving on a calm day or a stressed one. For the interest-rate side of this same story, our piece on what actually drives DXY and IHSG together covers the same 2026 rupiah crisis from the stock market's angle.