This study evaluates the effectiveness of monetary policy transmission to inflation in Indonesia from August 2016 to December 2025, a period that coincides with the implementation of the BI 7-Day Reverse Repo Rate and its subsequent renaming as the BI-Rate, while also covering the COVID-19 shock, the 2022 inflation surge, policy normalization, and the 2025 easing cycle. Monthly data comprising 113 observations include year-on-year CPI inflation, Bank Indonesia's policy rate, broad money (M2), and the rupiah–US dollar exchange rate. The empirical strategy combines an Autoregressive Distributed Lag (ARDL) model, bounds testing, and a first-difference short-run dynamic specification. Unit-root tests indicate that all variables are integrated of order one, I (1), with no I (2) variable. The Akaike Information Criterion selects an ARDL (4,1,0,1), but the Bounds Test produces an F-statistic of 2.124397, below the 5% lower bound of 2.790, indicating no evidence of a stable long-run relationship. In the short-run model, changes in the policy rate, M2, and the exchange rate are statistically insignificant, whereas the third lag of the change in inflation is positive and significant (coefficient 0.306491; p=0.0014). Diagnostic tests indicate no serial correlation or heteroskedasticity, adequate functional specification, and parameter stability according to CUSUM and CUSUM of Squares, although residual normality is rejected. The findings suggest that direct transmission through the three examined channels is statistically limited over the sample, underscoring the relevance of policy lags, credit and expectations channels, and supply-side and external shocks in explaining Indonesian inflation dynamics.