marginal rate of tax
noun

the percentage of tax which a taxpayer pays at the top rate, which he or she therefore pays on every further pound or dollar he or she earns.

Also called marginal tax rate

"...pensioner groups Claim that pensioners have the highest Marginal rates of tax. income earned by pensioners above $30 a week is taxed at 62.5 per cent, more than the highest marginal rate" [Australian Financial Review]

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