Meaning of “flat tax” in the English Dictionary

"flat tax" in American English

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flat taxnoun [ C ]

/ˈflæt ˈtæks/

social studies a tax rate that is the same for everyone, whether the person’s income is high or low

(Definition of “flat tax” from the Cambridge Academic Content Dictionary © Cambridge University Press)

"flat tax" in Business English

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TAX a tax that is paid at a single rate at all levels of income:

The government has introduced a 19% flat tax for both corporate and personal income.

(Definition of “flat tax” from the Cambridge Business English Dictionary © Cambridge University Press)