边际税率计算器

Marginal Tax Rate Calculator

Find the marginal tax rate from the change in tax and the change in income: MTR = (T₂ − T₁) / (Y₂ − Y₁).

📐 计算公式
边际税率:MTR = (税额₂ − 税额₁) ÷ (收入₂ − 收入₁) × 100(%),即新增一元收入中纳税所占比例;例 收入增 5 万、税额增 1.5 万 → 30%。校验:前后两期收入与税额四项必填守卫,收入差作为隐含分母不得为 0。判据:无固定分级,累进税制下 MTR 随收入档位抬升、恒不低于平均税率,结果保留两位小数。

输入两级收入及对应应纳税额,求边际税率。

📅 Tax rules snapshot as of Oct 2026 (current PRC tax rules); after any reform, defer to the latest official announcements.

Formula & Standard References

Item Formula / Rule Source / Standard
Definition Marginal rate = change in tax ÷ change in income, the rate on the last slice earned Individual Income Tax Law of the PRC, Annex 1 rate schedule
Versus average rate The average rate is total tax ÷ total income and never exceeds the top marginal rate OECD Revenue Statistics, Interpretative Guide
PRC brackets Comprehensive income has seven brackets from 3% to 45%, the top applying above 960,000 yuan Individual Income Tax Law of the PRC, Annex 1 rate schedule
📌 计算说明
  • MTR = Δ税额/Δ收入。
  • 收入增 5 万、税额增 1.5 万 → 30%。

📚 深度解析:边际税率

💡 常见使用场景

所得 10 万→15 万、税额 2 万→3.5 万
边际税率 MTR = (35000 − 20000) / (150000 − 100000) = 15000 / 50000 = 0.30,即 30%。
跨档确认
若下一档税额只增 1 万,则 MTR=20%,说明增量收入落在较低档次。

❓ 常见问题(FAQ)

边际税率说明什么?
它表示每多赚一元要交多少税,是决策增量行为(加班、投资)的关键参考。
与平均税率如何配合看?
边际看增量、平均看整体;高累进下边际远高于平均,抑制额外收入的边际激励。