Indirect taxes like GST and VAT touch nearly every transaction you make, yet most people — including small business owners — can’t confidently explain how to add or reverse-calculate them. Whether you’re pricing an invoice, checking a receipt, or planning a cross-border sale, understanding this math directly protects your margins.
Here’s a clear, practical guide to GST and VAT across the countries that use them most.
GST vs VAT — What’s the Difference?
GST (Goods and Services Tax) and VAT (Value-Added Tax) are functionally very similar — both are consumption taxes collected at each stage of the supply chain and ultimately paid by the end consumer. The main difference is largely naming convention by country: Australia, Canada, New Zealand, India, and Singapore call it GST, while the UK, EU nations, and most of the rest of the world call it VAT. As Investopedia explains, the underlying mechanics of collection and remittance are nearly identical regardless of the name.
GST/VAT Rates Around the World (2025 Table)
| Country | Standard Rate |
|---|---|
| Australia (GST) | 10% |
| New Zealand (GST) | 15% |
| Canada (GST/HST, varies by province) | 5% – 15% |
| United Kingdom (VAT) | 20% |
| India (GST, varies by category) | 5% – 28% |
Rates and thresholds change periodically — the UK government’s official VAT rate guidance and the Australian Taxation Office’s GST page are the best sources to confirm current rates before invoicing.
How to Add GST to a Price (Formula with Example)
GST-Inclusive Price = Price × (1 + Rate/100)
Example: A $150 product in Australia (10% GST):
$150 × 1.10 = $165 total, with $15 being the GST portion.
How to Remove/Reverse GST from a Price
If you know the final price and need to find the original (pre-tax) amount:
Original Price = GST-Inclusive Price ÷ (1 + Rate/100)
Example: A $165 GST-inclusive price in Australia:
$165 ÷ 1.10 = $150 original price, confirming the $15 GST amount.
This reverse calculation is especially useful for business owners reconciling receipts or figuring out how much GST they’ve actually collected from a batch of sales.
Real Business Scenarios (Invoice GST, Freelancer GST, Import GST)
- Invoicing clients: Once GST-registered, you’re generally required to state the GST amount separately on invoices, not just bury it in a lump total.
- Freelancer GST: Many countries require GST/VAT registration once revenue crosses a threshold (for example, Canada’s CRA guidance sets this at $30,000 CAD in most cases) — below that, registration is often optional.
- Import GST: Goods brought into a country are frequently subject to GST/VAT at the border, calculated on the item’s value plus shipping and any duties, which surprises many first-time importers.
US Sales Tax vs VAT — Key Differences for Cross-Border Sellers
The US doesn’t use GST or VAT — it uses sales tax, which is collected only at the final point of sale to the consumer, not at every stage of production like GST/VAT. This is a critical distinction for cross-border sellers: a US-based seller shipping internationally may need to register for VAT/GST in the buyer’s country, while overseas sellers shipping into the US must navigate the state-by-state sales tax landscape instead of a single national rate.
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Frequently Asked Questions
How do you calculate GST from total?
Divide the GST-inclusive total by (1 + GST rate as a decimal) to find the pre-tax price, then subtract that from the total to find the GST amount. For a 10% rate, divide by 1.10.
Is VAT the same as GST?
Functionally, yes — both are consumption taxes applied at each stage of the supply chain. The difference is mostly naming convention by country, though specific rates, thresholds, and exemptions vary.
Do I need to register for GST in Australia?
In Australia, GST registration is generally required once your business’s annual turnover reaches AUD $75,000, though voluntary registration below that threshold is allowed and sometimes beneficial for claiming input tax credits.
What is reverse charge GST?
Reverse charge shifts the responsibility for reporting GST/VAT from the seller to the buyer, most commonly used in cross-border B2B transactions to simplify tax collection when the seller isn’t registered in the buyer’s country.