Personal income includes wages and salaries, bonuses, business income, rental income, dividends, interest, and transfer payments such as government benefits. It is a broad measure of income received by households or individuals before taxes.
Personal Disposable Income is calculated by taking personal income and subtracting personal income taxes, leaving after-tax income. This is the money available for consumption, saving, debt repayment, or investment.
Main difference
Personal income = income received before taxes.
Personal disposable income = income left after taxes
Personal saving as a percentage of disposable personal income is the share of after-tax income that households do not spend. In plain terms, it is the saving rate: disposable income minus spending, expressed as a percent of disposable income