100.000 Rupiah

Indonesia's shift to polymer for the 100.000 Rupiah denomination reflects a decision made under sustained pressure from counterfeiting — earlier cotton-paper issues of the same denomination were among the most frequently forged in circulation. The domestic printing attribution is significant: Perum Peruri, the state security printer, has produced polymer notes in-house since the mid-2010s, one of relatively few government-owned facilities in Southeast Asia capable of doing so on polymer substrate.

The transparent window integrated into the polymer substrate functions as a primary authentication point rather than a supplementary one — a deliberate inversion of how security features are typically prioritized on paper issues.