marginal rate of taxation
marginal rate of taxationthe rate of TAXATION an individual would pay on an incremental unit of INCOME. For example, in a PROGRESSIVE TAXATION structure, if an individual paid tax at 30% up to a limit of £15,000, at which point the rate changed to 40%, the marginal rate of taxation on an income of £15,001 is 40%. The incremental rate of taxation on the last pound earned is 40%. See STANDARD RATE OF TAXATION, AVERAGE RATE OF TAXATION, PROPENSITY TO TAX, PROPORTIONAL TAXATION, REGRESSIVE TAXATION.
Collins Dictionary of Economics, 4th ed. © C. Pass, B. Lowes, L. Davies 2005