GST / VAT Calculator | Add, Remove & Multi-Item
Add or remove GST/VAT from any price. Multi-item invoices with individual rates. Country presets for Australia, UK, India, Canada, and EU. 6 currencies supported.
COUNTRY PRESETS
QUICK SCENARIOS
COMMON RATES
What Is the GST / VAT Calculator | Add, Remove & Multi-Item?
This GST/VAT calculator handles adding tax to prices, removing tax from tax-inclusive totals (reverse calculation), and computing the tax amount only. It supports up to 10 line items with individual tax rates, 6 currencies, country presets, and common rate buttons for 5% through 25%.
- ▸Add Tax: Enter the pre-tax price. The calculator adds GST/VAT on top to give the total.
- ▸Remove Tax (reverse): Enter the tax-inclusive total. The calculator extracts the original pre-tax price using Original = Total / (1 + rate).
- ▸Tax Amount Only: Shows just the tax figure without the total.
- ▸Multi-item: Add up to 10 line items with different rates, shows individual and grand totals.
- ▸Country presets: Click Australia, UK, India, Canada, EU, or US to load the standard rate and currency.
Formula
Add Tax (exclusive)
Total = P × (1 + r/100)
Price does not include tax. Tax is added on top.
Remove Tax (inclusive)
Original = T / (1 + r/100)
Price already includes tax. Extracts the pre-tax amount.
Tax Amount Only
Tax = P × r / 100
Shows just the tax amount without computing the total.
How to Use
- 1
Select a mode
Add Tax for prices without tax, Remove Tax for prices that include tax, or Tax Amount Only to see just the tax figure.
- 2
Choose a country preset
Click Australia GST, UK VAT, India GST, Canada GST, EU VAT, or US Sales Tax to auto-set the rate and currency.
- 3
Select currency
Choose USD, EUR, GBP, AUD, INR, or CAD from the currency buttons.
- 4
Set the tax rate
Click a common rate (5%, 10%, 12%, 15%, 18%, 20%, 25%) or type a custom rate in the input box.
- 5
Enter your amounts
Fill in the description and amount for each line item. Each item can have its own tax rate.
- 6
Add more items
Click + Add Item for multi-item invoices up to 10 rows.
- 7
Press Calculate Tax
Results show pre-tax amount, tax amount, total, and effective tax rate. Multi-item view shows a line-by-line breakdown.
- 8
Copy results
Use the Copy Results button to copy the summary to your clipboard.
Example Calculation
Example 1 | Add 10% GST (Australia) to $85
Standard Australian GST calculation. The customer pays $93.50 total.
Example 2 | Remove 20% VAT from £120 (UK)
Reverse VAT extraction. The £120 price already includes £20 of VAT.
Example 3 | Business invoice with multiple rates
Multi-item invoice in Indian GST. Grand total = subtotal + all taxes.
Understanding GST / VAT | Add, Remove & Multi-Item
GST vs VAT, What is the Difference?
GST (Goods and Services Tax) and VAT (Value Added Tax) are both consumption taxes, taxes paid at point of sale by the consumer. The key difference is implementation: VAT is typically applied at each stage of the supply chain with businesses reclaiming input tax, while GST is commonly collected at the final point of sale. Mathematically they are computed identically. All calculations run live in your browser with no server needed.
World GST/VAT Rates
| Country | Tax Type | Standard Rate | Currency |
|---|---|---|---|
| Australia | GST | 10% | AUD |
| United Kingdom | VAT | 20% | GBP |
| India | GST | 18% (standard) | INR |
| Canada | GST+PST | 5%+provincial | CAD |
| European Union | VAT | 20% (average) | EUR |
| United States | Sales Tax | 0%–11.5% (varies) | USD |
| New Zealand | GST | 15% | NZD |
| Singapore | GST | 9% | SGD |
The Reverse Calculation Explained
When a price is shown as "tax inclusive," you cannot simply subtract the rate percentage from the total. For a 20% VAT on a £120 inclusive price:
- ▸Wrong: £120 × 20% = £24 (this incorrectly treats 120 as the base)
- ▸Correct: £120 / 1.20 = £100 (pre-tax), tax = £120 − £100 = £20
- ▸Formula: Original = Total / (1 + rate/100)
- ▸The difference: £24 vs £20 is significant on large invoices.
Frequently Asked Questions
How do I add GST/VAT to a price?
To add tax to a pre-tax price, multiply by (1 + rate/100):
- • Total = Price × (1 + rate/100)
- • Example: $100 + 10% GST = $100 × 1.10 = $110
- • Tax amount = Total − Original = $10
How do I remove VAT from a price that includes tax?
Use the reverse formula, divide by (1 + rate/100):
- • Original = Inclusive Total / (1 + rate/100)
- • Example: £120 inclusive at 20% VAT: £120 / 1.20 = £100
- • VAT = £120 − £100 = £20
- • Do NOT simply calculate 20% of £120 = £24 (that is wrong!)
What is the difference between GST and VAT?
Both are consumption taxes paid by the end consumer. The main differences are structural:
- • VAT is applied at each stage of the supply chain; businesses claim back input VAT
- • GST is typically collected at the final point of sale (though Australia uses a VAT-style model)
- • Mathematically they are identical for end consumers, the formulas are the same
Can I calculate multiple items with different tax rates?
Yes, click + Add Item to add up to 10 line items. Each row has its own tax rate field. The calculator shows:
- • Individual pre-tax, tax, and total per item
- • Combined subtotal, total tax, and grand total
- • Effective blended tax rate across all items
What is the effective tax rate?
When multiple items have different tax rates, the effective rate is the blended average:
- • Effective rate = (Total tax / Total pre-tax) × 100
- • Example: $50 at 10% + $50 at 20% → effective rate = ($5 + $10) / $100 = 15%
Which countries use this calculator's standard rates?
Standard rates loaded by the country presets:
- • Australia: 10% GST
- • United Kingdom: 20% VAT
- • India: 18% GST (standard rate; reduced rates of 5%, 12% also exist)
- • Canada: 5% federal GST (provinces add PST separately)
- • EU: 20% (varies by country; Hungary highest at 27%)
What is input tax credit?
In a VAT/GST system, businesses can claim back the tax they paid on purchases (input tax) from the tax they collected on sales (output tax). This calculator shows the consumer-side calculation. For business accounting, you would subtract input tax credits from output tax to find the net tax payable to the government.
Is this calculator free and private?
Yes. All calculations run entirely in your browser, no amounts, rates, or results are sent to any server. The calculator is completely free with no registration required. Your last-used settings are saved locally in your browser for convenience.