Immediately after the announcement of Bank Indonesia, we saw the rupiah strengthening against the key global currencies. When Indonesia's central bank raises interest rates, then government bonds, fixed-income securities, and bank deposits in Indonesia begin offering higher yields (returns) than they did before. However, foreign investors (including the big institutional investors) cannot buy Indonesian bonds with foreign cash, and thus must first sell their own currency and buy rupiah. This massive surge in purchasing demand drives the rupiah's value upward.

At the same time, Bank Indonesia's higher interest rate environment is a pre-emptive move to keep inflation in check. While Indonesian inflation is safe at 2.42 percent year-on-year (y/y) in April 2026, the heavily weakened rupiah has made imports more expensive and this gradually leads to rising prices on the domestic market.

For listed companies on Indonesia's Stock Exchange, the rate hike is not positive news as it makes it more expensive for companies to borrow funds for business expansion. The benchmark Jakarta Composite Index is therefore in red territory on 20 May 2026, extending the market rout we saw recently as investors recalibrate to a tighter monetary environment.

Bahas