GST / VAT 計算機とは？

無料のオンライン GST/VAT 計算機。税込金額と税抜金額を計算。

Goods and Services Tax (GST) and Value Added Tax (VAT) are consumption taxes applied to most goods and services in many countries around the world. The rate varies by country — Australia has 10% GST, the UK has 20% VAT, Singapore has 9% GST, and India has a multi-slab GST system. GST/VAT Calculator handles adding tax to or removing tax from any amount with 20+ country presets.

Choose Add mode when you have an amount before tax and need to calculate the total including tax. For example, a AU$100 product plus 10% GST = AU$110 total with AU$10 GST. Choose Remove mode when you have a tax-inclusive total and need to find the original amount before tax. For example, a £120 VAT-inclusive price at 20% VAT = £100 original + £20 VAT.

Select a country from the preset list, which automatically applies the correct tax rate and label (GST, VAT, or other local name). The country selector covers Australia, New Zealand, Singapore, India, UK, Germany, France, and 20+ more. For countries or scenarios not covered, the custom rate option allows any percentage from 0.1% to 50%.

The result display shows three values clearly: the original amount (before tax), the tax amount, and the total (after tax). The tax label matches the country — it says "GST" for Australia and India, "VAT" for UK and Europe. The display makes it easy to report tax amounts separately for accounting and invoicing purposes.