GST Tax Calculator

GST (Goods and Services Tax) and VAT (Value Added Tax) are consumption taxes applied to the sale of goods and services. A GST tax calculator computes either the tax amount to add to a base price (tax-exclusive) or extracts the tax component from a price that already includes tax (tax-inclusive). For example, at 18% GST: a $100 base price becomes $118 tax-inclusive (add $18 tax), and a $118 tax-inclusive price has a $100 base with $18 tax embedded. Our GST tax calculator handles both directions instantly and supports any tax rate from 0% to 10,000%, covering GST, VAT, HST, and sales tax systems worldwide.

1. 1. Enter Your Amount: Type the price you want to calculate tax on. For tax-exclusive mode, enter the pre-tax base price. For tax-inclusive mode, enter the final price that already includes tax. All processing happens locally in your browser — your data never leaves your device.
2. 2. Choose a Tax Rate: Select from 15+ global presets covering India GST, UK/EU VAT, Australian GST, Singapore GST, US sales tax, and more — or enter a custom rate. Then choose whether to add tax to the price or extract it from a tax-inclusive amount.
3. 3. Get Instant Results: Click Calculate Tax to see the base price, tax amount, and total price with a full breakdown. A multi-rate comparison table shows the tax and total at all common rates for quick reference.

• Tax-Exclusive (Add Tax): Tax Amount = Base Price × (Rate ÷ 100). Total = Base Price + Tax Amount. Example: $100 × 18% = $18 tax → $118 total.
• Tax-Inclusive (Extract Tax): Base Price = Total ÷ (1 + Rate ÷ 100). Tax Amount = Total − Base Price. Example: $118 ÷ 1.18 = $100 base → $18 tax extracted.
• Effective Rate: The effective tax rate is always (Tax Amount ÷ Base Price) × 100, which equals the nominal rate for tax-exclusive calculations and is slightly lower for tax-inclusive extraction.
• Custom Rates: Our GST tax calculator accepts any rate from 0% to 10,000%, supporting compound tax scenarios, luxury tax rates, and any jurisdiction-specific rate worldwide.

Tax rates vary significantly by country and product category. India uses a tiered GST system with rates of 5%, 12%, 18%, and 28% depending on the goods or services. Australia and New Zealand apply a flat 10% GST. The UK charges 20% VAT as the standard rate. Singapore applies 9% GST (as of 2024). The EU standard VAT rate varies by member state, typically between 17% and 27%. US sales tax is set at the state and local level, ranging from 0% to over 10%. Our GST tax calculator includes presets for all major jurisdictions and a custom rate option for any other rate.