This paper analyzes why Japan introduced the self-assessment system for "income tax" in such adverse circumstances, what problems it faced as a result of its implementation, and how the country overcame these difficulties to achieve the stable operation of today's income tax system.

This paper analyzes why Japan introduced the self-assessment system for "income tax" in such adverse circumstances, what problems it faced as a result of its implementation, and how the country overcame these difficulties to achieve the stable operation of today's income tax system.