The correct answer is Personal disposable income = personal income “ personal tax payment “ non-tax payment. Personal disposable income(DPI):It is the amount of money that an individual or household has to spend or save after income taxes have been deducted. It is also known as disposable income. At the macro level, disposable personal income is closely monitored as one of the key economic indicators used to gauge the overall state of the economy. Formula: Personal disposable income = personal income “ personal tax payment “ non-tax paymentAdditional InformationSignificance:Disposable income is the portion of income available to an income earner after all income taxes are deducted. It is used by analysts to measure consumer spending, payment ability, probable future savings, and the overall health of a nations economy. Disposable income can be used to determine the financial reserves of households and the money available to be spent on goods and services.