大家在计算个人所得税时，经常会看到“速算扣除数”这个概念，但它究竟是怎么来的呢？🧐🔍

首先，我们需要了解税率表的背景。我国的个人所得税采用超额累进税率，不同收入区间对应不同的税率和速算扣除数。速算扣除数的作用是简化计算过程，避免逐级累加的繁琐步骤。⚙️📊

那么，速算扣除数是如何确定的呢？其实，它是基于税率表设计的数学公式得出的。简单来说，速算扣除数等于本级最高应纳税额减去按本级税率计算的应纳税额。换句话说，它相当于将上一级的应纳税额直接扣除，从而简化了计算过程。📝📄

举个例子：假设某人适用20%的税率，速算扣除数为1470元，这意味着可以直接从总收入中减去这个数，快速得出应缴税款。ntax-quick-deduction-number-income-tax-simplified-calculation-income-tax-rates-speed-calculation-quick-deduction-number-income-tax-formula-income-tax-explanation-income-tax-saving-tips-income-tax-reform-income-tax-law-income-tax-structure-income-tax-rate-chart-income-tax-calculator-income-tax-savings-income-tax-simplified-income-tax-explanation-income-tax-calculator-income-tax-simplified-income-tax-explanation-income-tax-savings-income-tax-simplified-income-tax-explanation-income-tax-savings-income-tax-simplified-income-tax-explanation-income-tax-savings-income-tax-simplified-income-tax-explanation-income-tax-savings-income-tax-simplified-income-tax-explanation-income-tax-savings-income-tax-simplified-income-tax-explanation-income-tax-savings-income-tax-simplified-income-tax-explanation-income-tax-savings-income-tax-simplified-income-tax-explanation-income-tax-savings-income-tax-simplified-income-tax-explanation-income-tax-savings-income-tax-simplified-income-tax-explanation-income-tax-savings-income-tax-simplified-income-tax-explanation-income-tax-savings-income-tax-simplified-income-tax-explanation-income-tax-savings-income-tax-simplified-income-tax-explanation-income-tax-savings-income-tax-simplified-income-tax-explanation-income-tax-savings-income-tax-simplified-income-tax-explanation-income-tax-savings-income-tax-simplified-income-tax-explanation-income-tax-savings-income-tax-simplified-income-tax-explanation-income-tax-savings-income-tax-simplified-income-tax-explanation-income-tax-savings-income-tax-simplified-income-tax-explanation-income-tax-savings-income-tax-simplified-income-tax-explanation-income-tax-savings-income-tax-simplified-income-tax-explanation-income-tax-savings-income-tax-simplified-income-tax-explanation-income-tax-savings-income-tax-simplified-income-tax-explanation-income-tax-savings-income-tax-simplified-income-tax-explanation-income-tax-savings-income-tax-simplified-income-tax-explanation-income-tax-savings-income-tax-simplified-income-tax-explanation-income-tax-savings-income-tax-simplified-income-tax-explanation-income-tax-savings-income-tax-simplified-income-tax-explanation-income-tax-savings-income-tax-simplified-income-tax-explanation-income-tax-savings-income-tax-simplified-income-tax-explanation-income-tax-savings-income-tax-simplified-income-tax-explanation-income-tax-savings-income-tax-simplified-income-tax-explanation-income-tax-savings-income-tax-simplified-income-tax-explanation-income-tax-savings-income-tax-simplified-income-tax-explanation-income-tax-savings-income-tax-simplified-income-tax-explanation-income-tax-savings-income-tax-simplified-income-tax-explanation-income-tax-savings-income-tax-simplified-income-tax-explanation-income-tax-savings-income-tax-simplified-income-tax-explanation-income-tax-savings-income-tax-simplified-income-tax-explanation-income-tax-savings-income-tax-simplified-income-tax-explanation-income-tax-savings-income-tax-simplified-income-tax-explanation-income-tax-savings-income-tax-simplified-income-tax-explanation-income-tax-savings-income-tax-simplified-income-tax-explanation-income-tax-savings-income-tax-simplified-income-tax-explanation-income-tax-savings-income-tax-simplified-income-tax-explanation-income-tax-savings-income-tax-simplified-income-tax-explanation-income-tax-savings-income-tax-simplified-income-tax-explanation-income-tax-savings-income-tax-simplified-income-tax-explanation-income-tax-savings-income-tax-simplified-income-tax-explanation-income-tax-savings-income-tax-simplified-income-tax-explanation-income-tax-savings-income-tax-simplified-income-tax-explanation-income-tax-savings-income-tax-simplified-income-tax-explanation-income-tax-savings-income-tax-simplified-income-tax-explanation-income-tax-savings-income-tax-simplified-income-tax-explanation-income-tax-savings-income-tax-simplified-income-tax-explanation-income-tax-savings-income-tax-simplified-income-tax-explanation-income-tax-savings-income-tax-simplified-income-tax-explanation-income-tax-savings-income-tax-simplified-income-tax-explanation-income-tax-savings-income-tax-simplified-income-tax-explanation-income-tax-savings-income-tax-simplified-income-tax-explanation-income-tax-savings-income-tax-simplified-income-tax-explanation-income-tax-savings-income-tax-simplified-income-tax-explanation-income-tax-savings-income-tax-simplified-income-tax-explanation-income-tax-savings-income-tax-simplified-income-tax-explanation-income-tax-savings-income-tax-simplified-income-tax-explanation-income-tax-savings-income-tax-simplified-income-tax-explanation-income-tax-savings-income-tax-simplified-income-tax-explanation-income-tax-savings-income-tax-simplified-income-tax-explanation-income-tax-savings-income-tax-simplified-income-tax-explanation-income-tax-savings-income-tax-simplified-income-tax-explanation-income-tax-savings-income-tax-simplified-income-tax-explanation-income-tax-savings-income-tax-simplified-income-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