What the GST and VAT Calculator Does
Goods and Services Tax (GST) and Value Added Tax (VAT) are multistage consumption taxes levied on the supply of goods and services globally. Businesses, contractors, freelancers, and consumers regularly need to calculate either the addition of sales tax to a net quote or reverse-calculate the pre-tax base amount from an all-inclusive receipt.
This dual-mode calculator eliminates manual fraction arithmetic. It enables seamless transitions between tax-exclusive and tax-inclusive figures, supporting both standard tax slab buttons (5%, 12%, 18%, 28%) and custom tax rates used across global jurisdictions.
How to Use the Tax Calculator
- Select Tax Operation: Choose "Add Tax" if your price is exclusive of tax, or "Remove Tax" if your receipt already includes tax.
- Enter Base Amount: Type your currency amount into the input box.
- Choose or Input Tax Rate: Click a preset slab button (such as 5%, 12%, 18%, or 28%) or type any customized percentage.
- View Itemized Breakdown: The calculator updates in real time to show Net Price, Tax Amount, and Gross Price.
- Copy Results: Click "Copy Breakdown" to paste the numbers directly into your invoicing software or accounting spreadsheet.
Worked Examples
Base (Net): $500.00 | Tax Rate: 18%
$\text{Tax Amount} = 500 \times \frac{18}{100} = \$90.00$
Gross Total: $500.00 + $90.00 = $590.00
Gross Total: $240.00 | Tax Rate: 20%
$\text{Pre-Tax Net} = \frac{240 \times 100}{100 + 20} = \frac{24000}{120} = \$200.00$
Tax Portion Deducted: $240.00 - $200.00 = $40.00
Tax Formula Reference
| Operation Mode | Mathematical Formula | Common Scenario |
|---|---|---|
| Add Tax (Exclusive) | $\text{Gross} = \text{Net} \times \left(1 + \frac{\text{Rate}}{100}\right)$ | Adding sales tax to consulting estimates |
| Remove Tax (Inclusive) | $\text{Net} = \frac{\text{Gross}}{1 + \left(\frac{\text{Rate}}{100}\right)}$ | Auditing pre-tax expenses from retail receipts |
| Tax Portion (From Inclusive) | $\text{Tax} = \text{Gross} - \left(\frac{\text{Gross} \times 100}{100 + \text{Rate}}\right)$ | Reporting VAT paid on business expense claims |