GST Calculator
Add GST to a price or remove it from a total.
GST calculation details
Use Add GST for tax-exclusive amounts or Remove GST when the amount already includes tax.
Currency
Use this when your amount is before GST.
GST rates vary by country, product type, and tax rules.
Common rate shortcuts
GST-inclusive total
£110.00
Final amount after adding GST.
GST-exclusive amount
£100.00
Net amount before GST.
GST amount
£10.00
Tax portion at 10%.
GST rate
10%
Rate entered for this calculation.
Calculation mode
Add GST
Tax-exclusive to gross.
Original amount
£100.00
Amount entered above.
Net / tax / gross breakdown
Net
£100.00
GST
£10.00
Gross
£110.00
Insights
What your GST result means
Calculation summary
Adding 10% GST to £100.00 gives a total of £110.00.
GST portion
The GST amount in this calculation is £10.00.
Removing GST correctly
The GST portion of a GST-inclusive price is not found by simply subtracting 10% from the total.
Invoice clarity
Separating net amount, GST amount, and gross total can help reduce pricing and bookkeeping confusion.
Basics
What GST means
Goods and Services Tax
GST stands for Goods and Services Tax and may apply to taxable goods and services.
Added to taxable sales
GST is usually added to the taxable price paid by the customer.
Collected by businesses
Registered businesses may collect GST and report it under local tax rules.
Rules vary
Rates, exemptions, and registration thresholds depend on jurisdiction.
Compare
Adding GST vs removing GST
Adding GST
Start with a GST-exclusive amount. GST amount equals net amount times GST rate, and gross amount equals net plus GST.
Removing GST
Start with a GST-inclusive amount. Divide by one plus the GST rate to find the net amount, then subtract to find GST.
Pricing
GST-inclusive vs GST-exclusive prices
GST-exclusive price
Price before GST.
GST amount
Tax portion added to the net price.
GST-inclusive price
Final price including GST.
Example: £100.00 exclusive + £10.00 GST = £110.00 inclusive.
Use cases
Common GST rates and use cases
GST rates are not universal. Choose the relevant rate for your jurisdiction and product type.
Invoices
Show net, GST, and gross totals clearly.
Quotes
Clarify whether quoted prices include or exclude GST.
Receipts
Review the tax component of a GST-inclusive purchase.
Ecommerce pricing
Check customer-facing totals before publishing prices.
Freelance billing
Separate service fees and tax where applicable.
Bookkeeping
Track taxable amounts and GST portions for records.
Tax notes
Business invoicing and tax notes
This calculator handles the arithmetic; tax treatment depends on your local rules.
Invoice display
Businesses may need to show GST separately on invoices depending on registration status and local requirements.
Different categories
Some products or services may be GST-free, exempt, zero-rated, or taxed differently.
Confirm obligations
GST registration rules vary by jurisdiction. Check your local tax authority or consider speaking with an accountant.
Formula
GST formula explanation
Add GST
Gross = Net × (1 + GST Rate)Used when the amount does not yet include GST.
Remove GST
Net = Gross ÷ (1 + GST Rate)Used when the amount already includes GST.
GST amount
GST = Gross − NetShows the tax portion included in or added to the price.
FAQ
GST calculator questions
GST stands for Goods and Services Tax. It is a consumption tax that may be added to taxable goods and services, depending on jurisdiction and product type.
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