noun
discretionary income
Economic term for income remaining after taxes and essential living expenses, available for saving or non-essential spending.
裁量所得が増えれば、趣味や旅行にお金を使える。
If discretionary income increases, you can spend money on hobbies and travel.
可処分所得 is disposable income (after tax), while 裁量所得 is discretionary income (after tax and essential expenses).
Compound of 裁量 (discretion) and 所得 (income). A modern economic term.