GST / VAT Calculator
Convert freely between gross (tax-inclusive) and net (tax-exclusive) amounts with the tax amount, supporting both forward add and reverse extraction.
Input Data
Results
At a glance:GST / VAT is an indirect tax on the value of goods or services. Net plus tax equals gross. Forward: tax = net × rate; gross = net + tax. Reverse: net = gross ÷ (1 + rate); tax = gross − net. This calculator converts between the two ends and the tax, supporting both adding tax and extracting it from a gross total — handy for travel, online shopping, customs and refund estimation.
Formula
Forward: tax = net × rate(%) ÷ 100; gross = net + tax.
Reverse: net = gross ÷ (1 + rate(%) ÷ 100); tax = gross − net.
Gross = net × (1 + r), r as decimal rate.
How to Use
- Enter the applicable rate (e.g. Japan 10%, UK 20%).
- Enter an amount in either net or gross.
- The tax and the other end are computed automatically.
Examples of gross/net/tax conversion
| Rate | Net | Gross | Tax |
|---|---|---|---|
| Japan 10% | ¥10,000 | ¥11,000 | ¥1,000 |
| EU 20% | €100 | €120 | €20 |
| Taiwan 5% | NT$1,000 | NT$1,050 | NT$50 |
Reverse: gross ¥11,000 → net = 11,000 ÷ 1.1 = ¥10,000. Same formula, any currency.
Case Studies
Case 1: Japan shopping at 10%
Item net ¥10,000, tax = 1,000, gross ¥11,000.
If only the gross ¥11,000 is known, net = 11,000 ÷ 1.1 = ¥10,000.
Case 2: EU 20% VAT
Gross €120, recover net = 120 ÷ 1.2 = €100, tax €20.
FAQ
Does Hong Kong have a consumption tax?
Hong Kong's revenue comes mainly from profits tax, salaries tax and stamp duty; there is no broad GST/VAT — only dutiable goods (tobacco, alcohol, fuel). So this tool is mainly for overseas travel, online shopping and cross-border customs.
Gross vs net?
Net (pre-tax) is the base selling price excluding consumption tax; gross (post-tax) is the total the customer pays. The difference is exactly one tax amount.
When is reverse extraction (gross to net) used?
When you only know the total inclusive amount — e.g. splitting the tax for expense claims, estimating the pre-tax cost, or computing the refund base at a tax-free shop (refunds are usually on the net).
Does tourist refund return the full tax?
Not always. Many countries (Japan, Korea) deduct a handling fee or set a minimum spend, so the actual refund is less than the nominal tax; some goods (consumables, cosmetics) have carry-time and quantity limits.
Rates by country?
Common: Japan 10% (partly 8%), Taiwan 5%, UK 20%, EU mostly 19%–21%, Australia 10%, Singapore 9%, Canada GST 5% (plus provincial). Rates change — check official sources.
Is VAT the same as GST?
Both are consumption taxes, just named differently: the EU and UK call it VAT (Value Added Tax); Australia, NZ, Singapore and Canada call it GST (Goods and Services Tax). The calculation is the same.
Related Tools
References
Content review: Calculatorism Science Team. Results are for reference only; please refer to the relevant authorities for the official figures.