Sales tax and VAT are both consumption taxes, and from a shopper's perspective they look almost identical — you pay a percentage on top of the sticker price. Behind the scenes they are radically different systems that affect pricing, accounting and cross-border ecommerce in major ways. This guide breaks down the differences with worked examples and the exact formulas you need for both.
What each tax actually is
Sales tax is a single-stage tax: it is added only at the final sale to the consumer. The retailer collects it and remits it to the state government. Manufacturers and wholesalers do not charge sales tax to each other.
VAT (Value-Added Tax) is multi-stage: every business in the supply chain charges VAT on what they sell and reclaims VAT on what they buy. Only the final consumer bears the full burden — businesses are 'pass-through' collectors.
Where each is used
- Sales tax: United States (state and local), parts of Canada (PST/GST)
- VAT: United Kingdom, all of the European Union, most of Asia, Australia (GST), most of Africa
- Hybrid: Canada (federal GST + provincial PST or harmonised HST)
The math is almost identical (for shoppers)
Shopper's-eye view: a $100 product at 8% sales tax costs $108. A €100 product at 20% VAT inclusive already costs €100; if VAT is added on top, it costs €120.
The big difference is whether the displayed price includes the tax. EU and UK retail prices are VAT-inclusive by law. US sales tax is added at checkout.
The formulas you actually need
- Add sales tax: Total = Price × (1 + Rate ÷ 100)
- Extract sales tax from a total: Price = Total ÷ (1 + Rate ÷ 100)
- Add VAT (net → gross): Gross = Net × (1 + Rate ÷ 100)
- Remove VAT (gross → net): Net = Gross ÷ (1 + Rate ÷ 100)
- VAT amount: VAT = Gross − Net
Business impact: registration thresholds
In the US, sales tax registration depends on 'nexus' — physical or economic presence in a state. Cross 200 transactions or $100,000 in sales in many states and you must register.
In the EU/UK, VAT registration depends on turnover. The UK threshold is £90,000 (2026); below that, registration is optional. Once registered, you charge VAT on every sale and can reclaim VAT on business purchases.
Cross-border ecommerce
Selling into the EU from outside triggers EU VAT obligations via the Import One-Stop Shop (IOSS) on orders under €150. Selling into the US triggers sales tax obligations once you cross economic-nexus thresholds in each state. Both systems are complex — most serious ecommerce brands use a tax automation tool from day one.
Calculate either tax instantly
SnapFetch's free Sales Tax Calculator handles US-style add-on tax. The free VAT Calculator handles both directions — add VAT to a net price or extract VAT from a gross price — with one-click rate switching for the UK, Germany, France and beyond.
Try the free VAT Calculator and Sales Tax Calculator — instant results, no signup, on any device.
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