The big picture of the development of the Finnish municipal economy is the same whether it is examined at the national level, by size class or by region. Both revenue and expenditure have risen sharply between 2002 and 2018. A significant share of municipalities has not been able to finance their investments with their income and cash flow has remained negative. This raises the need to evaluate the effectiveness of the method of assessing the principle of financing to ensure municipal autonomy in the future.