VAT, GST, and Sales Tax: A Complete Guide for UK, Australia, and US Businesses

What Is VAT?

Value Added Tax (VAT) is a consumption tax applied at each stage of the production and distribution chain on the "value added" at each stage. The final consumer bears the full tax burden, but businesses collect and remit VAT at each stage of the supply chain. VAT is the primary indirect tax in the United Kingdom and European Union. The standard UK VAT rate is 20%. Reduced rates of 5% apply to certain goods including home energy and children's car seats. A zero rate (0%) applies to most food, children's clothing, and books. Businesses with annual turnover above £90,000 (as of 2024) must register for VAT.

What Is GST?

Goods and Services Tax (GST) functions similarly to VAT and is used in Australia, Canada, New Zealand, Singapore, and India among others. Australia applies GST at a flat rate of 10% on most goods and services. Canada applies GST at 5% federally, with additional provincial sales taxes in most provinces. New Zealand applies GST at 15%. Unlike VAT, which has multiple rates in the UK and EU, Australia's GST is simpler with fewer exemptions — fresh food, health services, and education are the main zero-rated categories.

How US Sales Tax Differs

US sales tax differs fundamentally from VAT and GST in that it is collected only at the final point of sale to the consumer — there is no tax at intermediate production stages. Unlike VAT and GST, which are federal taxes, US sales tax is a state and local tax with no federal equivalent. Rates vary by state from 0% (in five states with no sales tax: Oregon, Montana, New Hampshire, Delaware, and Alaska) to over 10% in some localities. The complexity of US sales tax compliance — with thousands of jurisdictions each having different rates and rules — is a significant challenge for multi-state businesses.

Tax Inclusive vs Tax Exclusive

Tax-exclusive pricing (also called tax-added pricing) shows the pre-tax price and adds tax separately at checkout. A $100 item with 20% VAT costs $120 at checkout. This is standard in US retail where the listed price does not include sales tax. Tax-inclusive pricing (also called tax-included pricing) shows the final price with tax already included. A £120 item with 20% VAT included means the pre-tax price is £100 and VAT is £20. UK and Australian prices are typically displayed tax-inclusive, while US prices are typically tax-exclusive.

Calculating VAT and GST

To add tax to a pre-tax amount: Total = Pre-tax Amount × (1 + Tax Rate). For a £100 item with 20% VAT: £100 × 1.20 = £120. To extract tax from a tax-inclusive amount: Tax = Inclusive Price × (Tax Rate / (1 + Tax Rate)). For a £120 VAT-inclusive price at 20%: Tax = £120 × (0.20 / 1.20) = £20. Pre-tax price = £120 - £20 = £100. This extraction formula is used when you receive a VAT-inclusive invoice and need to separate the tax component for accounting purposes.

How to Use Our Free Tax Calculator

Our free VAT/GST/Sales Tax calculator at cookiescursor.com handles both tax-exclusive (adding tax) and tax-inclusive (extracting tax) calculations. Select your tax type, enter the rate, choose your mode, and see the pre-tax amount, tax amount, and total instantly. Common rates are pre-filled for UK VAT, Australian GST, and other major tax systems. Currency selector supports 40+ currencies. No signup required.

Frequently Asked Questions

Do I need to charge VAT as a freelancer?
In the UK, you must register for VAT if your annual taxable turnover exceeds £90,000. Below this threshold, VAT registration is voluntary. In Australia, GST registration is required above AUD $75,000 annual turnover.

What is a VAT invoice?
A VAT invoice is a document that shows the VAT-exclusive price, the VAT amount, and the VAT-inclusive total, along with the seller's VAT registration number. VAT-registered businesses must issue compliant VAT invoices.

Can I reclaim VAT on business purchases?
Yes. VAT-registered businesses can reclaim VAT paid on business purchases (input tax) against VAT charged on sales (output tax). The net amount is remitted to HMRC.

What is reverse charge VAT?
Reverse charge VAT applies in certain B2B transactions, particularly for services supplied across EU borders. The recipient rather than the supplier accounts for the VAT, shifting the compliance obligation.

How does sales tax nexus work in the US?
Nexus is a sufficient connection between a business and a state that creates a sales tax collection obligation. Following the 2018 South Dakota v. Wayfair Supreme Court decision, economic nexus (based on sales volume) has become the standard, requiring online sellers to collect sales tax in states where they exceed certain revenue thresholds.

What is zero-rated vs exempt in VAT?
Zero-rated supplies are taxable at 0% — businesses can still reclaim input VAT on related purchases. Exempt supplies are outside the VAT system entirely — businesses cannot reclaim input VAT on costs related to exempt supplies.

Calculate Your Tax Now

Use our free VAT/GST/Sales Tax calculator for instant tax calculations. No signup required.