An Advanced Multidimensional Impact Assessment of India's Census 2027: Economic and Financial Implications, Behavioural Dynamics, Governance Effectiveness, Political Economy, Social Equity and Evidence-Based Public Policy, With Special Reference to Tamil Nadu

India’s Census 2027 offers an important opportunity to update demographic and household information after the 2011 Census and strengthen public planning. This article assesses the census’s potential economic, financial, behavioural, governance, political and social implications, with special reference to Tamil Nadu. It uses a descriptive and analytical approach based on secondary sources, including Census 2011, government reports, the National Family Health Survey, labour statistics and state-level publications. The analysis considers how updated data on population, households, migration, employment, education, housing and social groups could inform fiscal planning, infrastructure investment, welfare delivery and regional development. For Tamil Nadu, the findings may be especially relevant to population ageing, urban growth, changing workforce needs and rural–urban disparities.