Sharia-based monetary policy instruments, such as the Bank Indonesia Sharia Certificate (SBIS) and the Sharia Interbank Money Market (PUAS), contribute significantly to liquidity stability and expand access to sharia banking services. Even though the sharia banking sector continues to grow, the market share of the national banking industry is still relatively small due to low financial literacy, limited infrastructure and global economic challenges. This research highlights the importance of strengthening sharia financial literacy, developing digital infrastructure, as well as collaboration between the government, private sector and Bank Indonesia to overcome these obstacles. Strategic recommendations are provided to increase sharia-based financial inclusion which is expected to become a model for countries where the majority of the population is Muslim.

The development of the National Capital City (IKN) triggers an increase in demand for goods and services, especially in the construction and basic needs sectors, which can cause a spike in regional and national inflation. Monetary policy faces new challenges, including increasing interest rates and the risk of rupiah exchange rate volatility due to dependence on foreign debt financing. These projects also influence economic distribution, creating investment opportunities, but potentially increasing economic inequality. This research emphasizes the importance of coordination between monetary and fiscal policies to mitigate negative impacts on national economic stability.