Some discontented taxpayers have suggested that complexity be removed from the income tax structure by applying a flat tax rate to the gross income of all taxpayers. This approach violates which concept?

Question

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The ability to pay concept states that those with higher incomes should pay a higher percentage of their income in taxes, while those with lower incomes should pay a lower percentage. Applying a flat tax rate to all taxpayers would not take into account their ability to pay and would violate this concept.

Some Discontented Taxpayers Have Suggested That Complexity Be Removed from the Income