Definition of proportional tax
: a tax in which the tax rate remains constant regardless of the amount of the tax base
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“Proportional tax.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/proportional%20tax. Accessed 28 Jun. 2022.
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Time Traveler for proportional tax
The first known use of proportional tax was circa 1943
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