Introduction: In 2026, Japan’s tax system enters a phase of systemic reform, shifting focus from purely fiscal balance to promoting investment and optimizing wealth allocation. The reforms include raising basic income deductions, adjusting tax thresholds, enhancing corporate investment incentives, improving crypto asset taxation, and aligning with international tax standards. Overall, the tax structure is changing, reshaping investment flows and wealth distribution, sending clear signals to individuals, corporations, and cross-border investors.