In 2023, Japan's public administration and defence, as well as compulsory social security output, was recorded at 46.5 trillion yen. From 2024 onwards, the sector is expected to grow steadily, with a projected increase of about 2.73% year-on-year in 2025, 2.63% in 2026, 2.54% in 2027, and approximately 2.46% in 2028. Over this five-year period, the cumulative annual growth rate (CAGR) is estimated to be around 2.59%, showcasing a consistent upward trajectory in government expenditure in these sectors.

Future trends to watch for include:

Potential impacts of demographic shifts, notably aging population dynamics influencing social security demands.
Adjustments in defence expenditure amidst evolving geopolitical tensions in the Asia-Pacific region.
Implementation of technological advancements in public administration to improve efficiency and reduce costs.