What is GST and VAT? Complete Tax Guide for US, UK & Canada 2025
GST and VAT are consumption taxes that affect almost every product and service you buy — yet most people do not fully understand how they work. Whether you are a consumer in the US trying to understand sales tax, a UK shopper dealing with VAT, or a Canadian business owner handling GST and HST, this complete guide explains everything clearly with real examples and a free calculator.
We added our GST/VAT calculator to CalcWise after realising that many small business owners and freelancers were manually calculating tax amounts — and often making errors that cost them money. Our team verified every formula against the official HMRC VAT calculation guidelines for the UK, the Australian Taxation Office (ATO) for GST, and the Canada Revenue Agency (CRA) for Canadian GST/HST. The calculations are correct for real-world use.
What is GST?
GST (Goods and Services Tax) is a consumption tax on the supply of goods and services. It is collected at every stage of the supply chain, but ultimately paid by the end consumer. Businesses collect GST from customers, deduct the GST they paid on their own purchases (input tax credit), and remit the net amount to the government. Countries using GST include Australia (10%), Canada (5%), India (5–28%), Singapore (9%), and New Zealand (15%).
What is VAT?
VAT (Value Added Tax) works identically to GST — it is a multi-stage consumption tax where each business in the chain charges VAT on sales and reclaims VAT on purchases. The key difference is the name and rate. VAT is used throughout Europe, the UK, the Middle East, and parts of Africa and Asia. Standard VAT rates range from 5% (UAE) to 27% (Hungary). The UK standard rate is 20%, Germany is 19%, France is 20%.
GST vs VAT vs US Sales Tax
| Feature | GST/VAT | US Sales Tax |
|---|---|---|
| Who collects | Collected at every supply chain stage | Collected only at final retail sale |
| Who pays ultimately | End consumer | End consumer |
| Business reclaim? | Yes — input tax credits | No — businesses pay full price |
| Rate consistency | Usually one national standard rate | Varies by state, county, and city |
| Shown in price? | Usually included (UK, Aus, EU) | Usually added at checkout (US) |
| Countries using it | 160+ countries | Only the US among major economies |
How to Calculate GST / VAT
Adding Tax to a Price (Tax Exclusive / Ex-Tax)
When a price is shown without tax (common in US, B2B transactions, many Australian business invoices):
Tax Amount = Price × (Rate ÷ 100) | Final Price = Price + TaxExample: Product costs $500, GST 10%:
Tax = $500 × 10% = $50 → Final price = $550
Removing Tax from a Price (Tax Inclusive / Inc-Tax)
When a price already includes tax (common in UK, Australia retail, EU):
Pre-Tax Price = Final Price ÷ (1 + Rate÷100) | Tax = Final − Pre-TaxExample: UK price £120 including 20% VAT:
Pre-tax = £120 ÷ 1.20 = £100 → VAT paid = £20
Tax Rates by Country
| Country | System | Standard Rate | Reduced Rate |
|---|---|---|---|
| United Kingdom | VAT | 20% | 5% (energy, children's car seats) |
| Australia | GST | 10% | 0% (food, healthcare, education) |
| Canada | GST + HST | 5% federal + up to 10% provincial | 0% (basic groceries, health) |
| Germany | VAT | 19% | 7% (food, books, hotels) |
| France | VAT | 20% | 5.5% (food) / 10% (restaurants) |
| UAE | VAT | 5% | 0% (healthcare, education) |
| India | GST | 18% (standard) | 5% / 12% (essentials) |
| Singapore | GST | 9% (2024) | 0% (exports) |
Common GST / VAT Mistakes to Avoid
- Confusing inclusive and exclusive prices: A $100 ex-tax and a $100 inc-tax price are completely different. Always clarify which applies before calculating.
- Using the wrong formula to remove VAT: You cannot simply subtract 20% from a VAT-inclusive price. On a £120 price with 20% VAT, the VAT is £20 (not £24). Use the correct formula: £120 ÷ 1.20 = £100.
- Forgetting that zero-rated ≠ exempt: In the UK and many VAT systems, zero-rated goods have a 0% rate but businesses can still reclaim input VAT on related purchases. Exempt items are different — businesses cannot reclaim input VAT on purchases related to exempt supplies.
- Not registering when required: In the UK, you must register for VAT when your taxable turnover exceeds £90,000 in any 12-month period (2024/25). In Australia, when turnover exceeds AUD $75,000. In Canada, when revenue exceeds CAD $30,000 in any quarter or year.
💡 Quick VAT check: If you see a price in the UK, EU, or Australia without any "ex VAT" or "excl. GST" label, assume it includes tax. Prices in the US typically do not include sales tax — it is added at checkout. B2B invoices in most countries show ex-tax prices with tax applied separately.
Related Tools and Articles
GST / VAT CalculatorAdd or remove any tax rate from any price — instant, free, supports all countries. Discount CalculatorFind final price after any discount — often needed alongside tax calculations. Percentage CalculatorCalculate any percentage quickly including tax percentages and rate comparisons. Profit Margin GuideHow to calculate gross and net profit margin for any business transaction. Personal Budget GuideBuild a monthly budget that actually works — the 50/30/20 rule explained.GST and VAT Rates by Country (2025)
Tax rates vary significantly worldwide. Here's a reference guide for the most common countries:
| Country | Tax Name | Standard Rate | Reduced Rate | Exempt Items |
|---|---|---|---|---|
| Australia | GST | 10% | 0% | Basic food, health, education |
| Canada | GST/HST | 5% (federal) + 0-10% (provincial) | 0% | Basic groceries, medical |
| United Kingdom | VAT | 20% | 5% | Food, children's clothing, books |
| Germany | VAT (MwSt) | 19% | 7% | Most food, books, newspapers |
| France | TVA | 20% | 5.5% | Basic food, medical equipment |
| India | GST | 18% | 5%, 12% | Most food, healthcare |
| New Zealand | GST | 15% | None | Very few exemptions |
| UAE | VAT | 5% | 0% | Healthcare, education, 95+ food items |
| Pakistan | GST/Sales Tax | 17% | Various | Agricultural produce, certain food |
Sales Tax in the United States: How It's Different
Unlike most countries that use GST/VAT, the United States does not have a federal sales tax. Instead, 45 states plus Washington D.C. have their own state sales taxes, and many cities and counties add additional local taxes on top. This creates a complex patchwork:
- No sales tax: Oregon, Montana, New Hampshire, Delaware, Alaska (state level)
- Lowest rates: Colorado (2.9%), Hawaii (4%), Wisconsin (5%)
- Highest combined rates: Louisiana (~9.5%), Tennessee (~9.5%), Arkansas (~9.4%)
- California: 7.25% state + local additions; some areas exceed 10%
For e-commerce businesses, calculating the right sales tax for every customer location is complex. Since 2018 (South Dakota v. Wayfair), online retailers must collect sales tax in states where they have "economic nexus" — typically $100K+ in sales or 200+ transactions. Our tax calculator can help with basic calculations.
Input Tax Credit: How Businesses Recover VAT/GST
The key feature that makes VAT/GST different from a cumulative sales tax is the input tax credit system. Here's how it works in practice:
- A manufacturer buys raw materials for $1,000 + $180 GST (18%) = pays $1,180 total. Collects $180 input credit.
- Manufactures product worth $3,000. Sells to distributor for $3,000 + $540 GST. Remits to government: $540 − $180 = $360.
- Distributor buys for $3,540 (including $540 GST). Sells to retailer for $4,500 + $810 GST. Remits: $810 − $540 = $270.
- Retailer sells to consumer for $6,000 + $1,080 GST. Remits: $1,080 − $810 = $270.
- Consumer pays $7,080 total. Total tax collected: $360 + $270 + $270 = $900 = exactly 18% of $5,000 value added.
The entire system is designed so only the final consumer bears the full tax. Each business in the chain remits only the tax on the value they added. This prevents "tax cascading" where you'd pay tax on tax at each stage.
GST Registration: When Is It Required?
Most countries have a registration threshold — businesses below a certain revenue don't need to register for GST/VAT:
- Australia: Annual turnover exceeding AUD $75,000 (AUD $150,000 for non-profits)
- UK: VAT-taxable turnover exceeding £90,000 in any 12-month period
- Canada: Worldwide taxable supplies exceeding CAD $30,000 in a single quarter or year
- India: Annual aggregate turnover exceeding ₹20 lakh (₹10 lakh for special states)
- Pakistan: Annual turnover exceeding PKR 10 million for manufacturers/importers
Voluntary registration is also possible below these thresholds, which allows businesses to claim input tax credits. If you're a freelancer or small business regularly purchasing business supplies, voluntary registration may benefit you financially.
Common GST/VAT Mistakes and How to Avoid Them
- Not keeping invoices: You need proper tax invoices to claim input credits. Keep digital copies for at least 7 years.
- Claiming GST on exempt purchases: You can't claim input credits on purchases that aren't for business use.
- Wrong tax period: GST filing periods vary — monthly, quarterly, or annually depending on your turnover and country.
- Not registering in time: Late registration carries penalties and backdated liabilities in most countries.
- Applying tax to exempt supplies: If you provide healthcare, education, or certain financial services, you may be making exempt supplies — don't charge GST on these.
For personal finance, understanding GST/VAT helps you budget accurately — the sticker price isn't what you pay when tax is added. Use our GST calculator to find the tax-inclusive or tax-exclusive price for any amount and rate. For broader budgeting help, see our personal budget guide.
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Frequently Asked Questions
Yes — GST and VAT are essentially the same type of consumption tax. Both are charged at each stage of the supply chain, both are ultimately paid by the end consumer, and both allow businesses to reclaim the tax paid on their inputs. The only real differences are the name (countries choose one or the other) and the rate, which varies by country.
Divide the VAT-inclusive price by 1.20 (for 20% VAT) to find the pre-VAT price. Then subtract to find the VAT amount. Example: £240 ÷ 1.20 = £200 pre-VAT. VAT = £240 − £200 = £40. Our free GST calculator does this automatically for any tax rate.
HST (Harmonised Sales Tax) is a combination of federal GST (5%) and provincial sales tax merged into a single tax in some Canadian provinces. Ontario charges 13% HST, New Brunswick, Nova Scotia, Newfoundland, and PEI charge 15% HST. Provinces without HST (like Alberta and British Columbia) charge the 5% federal GST separately plus their own provincial tax. The IRS provides official guidance on sales and use tax obligations for US businesses.
US-based businesses selling digital goods or services to EU customers may be required to register for VAT in the EU or use the EU's One Stop Shop (OSS) scheme if annual sales to EU consumers exceed certain thresholds. The UK has similar rules post-Brexit. Businesses selling physical goods internationally may also need to register for VAT/GST in destination countries. Always consult a tax professional for international compliance advice.