等比例税是一种固定税率,它的税率不会随着征税部分收入的增加或减少而改变,所以税额与征税部分收入成比例。[1]“等比例”描述了这种税对收入或支出的分配效应,特指其税率始终保持一致(随着收入消费变化不会增高或者降低),边际税率始终不变。[2][3]

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