JAKARTA, Thekabarnews.com—The Indonesian rupiah returned to a downward trend just days after Bank Indonesia (BI) delivered a surprise 50-basis-point interest rate hike. This move raised questions about the effectiveness of monetary policy to stabilize the country’s currency. Moreover, it also occurred amid broader economic concerns.

At a meeting of the Board of Governors on May 20, 2026, Bank Indonesia, the Indonesian central bank, raised its benchmark interest rate by 50 basis points. Now, it stands at 5.25 percent.

It was widely considered a move to support the rupiah and help keep financial markets stable. This occurred amid mounting external and domestic pressures.

The policy first seemed to have the desired effect. The rupiah appreciated to Rp17,685 per U.S. dollar from Rp17,719 on Thursday, Jakarta Interbank Spot Dollar Rate (JISDOR) data showed.

On May 21, the rupiah improved to 17,673 rupiah, reflecting a positive market response to the central bank’s move. The recovery, however, was brief.

The rupiah resumed its decline within two days of trading, moving back above Rp17,700 per dollar. The currency closed at Rp 17,717 on May 22. It fell further to Rp17,743 on May 25 and again to Rp17,789 on May 26.

The pressure built up after the Eid al-Adha holiday period. The rupiah closed at Rp17,811 per U.S. dollar on May 28, according to Investing.com market data. In addition, intraday trading saw it reach Rp17,909, reflecting lingering fears of investors.

Market analysts said just raising interest rates might not be enough to stop the currency’s slide.

“A 50 basis point hike was a big shift in monetary policy, but it was more about short-term market pressures than deeper structural issues,” said research firm Algo Research, as cited in KONTAN NEWS.

But investors are more worried about macro issues like uncertainty over fiscal policy. They also worry about the consistency of regulation, law enforcement, and the government’s credibility.

The report stated that capital outflows from Indonesia, driven by these concerns, have pressured the rupiah. This effect persists despite the central bank’s efforts.

“Monetary policy measures can be strong but are unlikely to arrest the rupee’s slide if the underlying concerns of investors are not addressed,” the research team wrote in a report dated May 21.

A combination of factors often determines the exchange rate. These include interest rate differentials, fiscal stability, investor confidence, geopolitical developments, and the world economy.

Higher interest rates can help bring in foreign capital and support a currency in the short term. However, longer-term stability usually requires deeper confidence in economic management and the direction of policy.

The recent performance of the rupiah thus highlights the challenging task policymakers face. They must balance economic growth, financial stability, and investor confidence.

With global markets still volatile and domestic economic issues still in focus, investors will be looking for the next policy moves from both Bank Indonesia and the government.

The currency’s return to weakness indicates that more than just monetary tightening may be necessary to restore confidence, at least for now.

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