On the same ₹23,00,000 gross, a worker takes home roughly ¥95,000 more per year in Japan than in India. That gap reflects the tax structure alone — before rent, healthcare, or savings behaviour come into play.
Housing is the first multiplier. India has moderate rent pressure, while Japan has moderate rent pressure. The two markets behave similarly, so most of the gross-to-net advantage flows straight into disposable income.
Healthcare and pensions go in the opposite direction. India runs a mixed healthcare model — Mostly private out-of-pocket or employer cover; public system varies sharply. Japan uses a universal model — Universal Shakai Hoken with 30% patient co-pay; very low absolute costs. The country with lower take-home often shifts costs that the other country leaves to your private budget.
Net-of-everything, a relocation decision should weigh basic public welfare in India against comprehensive welfare state in Japan, plus differences in pension capture, social safety nets, and city-level cost of living.