Relatively lower inflation allowed the central bank to hold off with raising rates until August.
But in September inflation reached 5.95%, the highest since 2015, and will likely push the central bank to continue tightening.
BI, until recently one of the world's last dovish central banks, followed a modest quarter-point rate rise in this cycle with a surprisingly aggressive 50 basis point rise in September.
The weaker rupiah , down more than 8% so far this year, has prompted economists to bring forward their rate hike expectations.
Reuters Poll: Indonesia inflation and monetary policy outlookThe poll showed inflation was expected to average 4.6% this year and inch down to 4.5% in 2023, a massive upgrade from 3.9% and 3.5% predicted in July.