🧾 发票税额计算Invoice Tax Calculator

使用说明与常见问题How-to & FAQ

「发票税额计算」是什么？What is the Invoice Tax Calculator tool?

小计 × 税率 = 税额，合计 = 小计 + 税额；可选折扣%。可设置「小计」、「税率 %」、「折扣 %」。Tax = subtotal × rate; total = subtotal + tax; optional discount %. Settings: Subtotal, Tax rate %, Discount %.

如何使用「发票税额计算」？How do I use the Invoice Tax Calculator tool?

填写小计、税率，按需填写折扣，即可得到税额和含税总额。结果会随输入实时更新。Enter the subtotal and tax rate, plus a discount if there is one, to get the tax and the total. The result updates as you type.

含税反推？Tax-inclusive?

本页按未税小计加税；含税价请先除以 (1+税率)。This page adds tax onto a net subtotal; for tax-inclusive prices divide by (1 + rate) first.

能举个计算实例吗？Can you show a worked example?

例如在「发票税额计算」中填 小计 = 1000，税率 % = 13，折扣 % = 0，结果区显示：折后小计：1,000.00；税额：130.00；价税合计：1,130.00For example, entering Subtotal = 1000, Tax rate % = 13, Discount % = 0 in the Invoice Tax Calculator gives: Net subtotal: 1,000.00; Tax: 130.00; Total: 1,130.00

哪些输入会被检查？Which inputs are validated?

「发票税额计算」会检查这些输入——「小计」、「折扣 %」：必须填写，不能为负数；「税率 %」：必须填写；绝对值超过 10¹⁵ 的数也会被拒绝。不符合时结果区显示具体提示，不会给出数字。The Invoice Tax Calculator checks its inputs — "Subtotal", "Discount %": required, cannot be negative; "Tax rate %": required; numbers above 10¹⁵ in absolute value are rejected too. When a value fails, the result area names the problem instead of showing a number.

有哪些选项可以调整？What options can I adjust?

「发票税额计算」的设置：「小计」默认 1000；「税率 %」默认 13；「折扣 %」默认 0。每次生成结果都按当前设置处理。Settings in the Invoice Tax Calculator — "Subtotal" default 1000; "Tax rate %" default 13; "Discount %" default 0. The result always uses the current settings.

计算结果可以作为最终依据吗？Can I rely on the result?

「发票税额计算」按标准公式计算，结果仅供参考；实际金额以银行、券商或税务机关的规则和四舍五入方式为准。The Invoice Tax Calculator uses standard formulas and is for estimation only; actual figures depend on your bank, broker or tax authority's rules and rounding.

「发票税额计算」免费吗？需要注册吗？Is the Invoice Tax Calculator free? Do I need an account?

「发票税额计算」完全免费，无需注册或安装，打开网页即可使用，手机和电脑都能用；输入的内容只在你的浏览器本地处理。The Invoice Tax Calculator is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.