Disposable and discretionary income
Disposable income is total personal income minus personal current taxes. In national accounts definitions, personal income, minus personal current taxes equals disposable personal income. Subtracting personal outlays (which includes the major category of personal (or, private) consumption expenditure) yields personal (or, private) savings.
The marginal propensity to consume (MPC) is the fraction of a change in disposable income that is consumed. For example, if disposable income rises by $100, and $65 of that $100 is consumed, the MPC is 65%. Restated, the marginal propensity to save is 35%.
For the purposes of calculating the amount of income subject to garnishments, United States' federal law defines disposable income as an individual's compensation (including salary, overtime, bonuses, commission, and paid leave) after the deduction of health insurance premiums and any amounts required to be deducted by law. Amounts required to be deducted by law include federal, state, and local taxes, state unemployment and disability taxes, social security taxes, and other garnishments or levies, but does not include such deductions as voluntary retirement contributions and transportation deductions. Those deductions would be made only after calculating the amount of the garnishment or levy. The definition of disposable income varies for the purpose of state and local garnishments and levies.
Discretionary income is disposable income (after-tax income), minus all payments that are necessary to meet current bills. It is total personal income after subtracting taxes and typical expenses (such as rent or mortgage, utilities, insurance, medical, transportation, property maintenance, child support, food and sundries, etc.) to maintain a certain standard of living. It is the amount of an individual's income available for spending after the essentials (such as food, clothing, and shelter) have been taken care of:
- Discretionary income = Gross income - taxes - all compelled payments (bills)
Despite the definitions above, disposable income is often incorrectly used to denote discretionary income. The meaning should therefore be interpreted from context. Commonly, disposable income is the amount of "play money" left to spend or save. The Consumer Leverage Ratio is the expression of the ratio of Total Household Debt to Disposable Income.
- BEA : Disposable personal income
- "31 CFR 285.11". Legal Information Institute. Cornell University. Retrieved June 29, 2012.
- Linden, Fabian (1998). "A Marketer's Guide to Discretionary Income (abstract)". US Department of Education. Retrieved 2007-12-27.
- A simple discretionary income calculator -- even though this says it's measuring "disposable income," using the economist's language, it's discretionary income.
- Eurostat, News Release No. 60/2010, Household Savings and Disposable Income, 30 April 2010
- Eurostat, Statistics Explained, Glossary article: National Disposable Income
- OECD Disposable income statistics
- Google - public data: GDP and Personal Income of the U.S. (annual): Disposal Personal Income
- Google - public data: GDP and Personal Income of the U.S. (annual): Disposal Personal Income per capita