Value-added tax is a consumption tax collected piece by piece across a supply chain. From the consumer's perspective it looks the same as sales tax: a percentage added at the register. From a business perspective it is more interesting: every business along the way collects VAT on its sales and reclaims VAT on its purchases, with the net difference paid to the tax authority.
This guide explains how VAT actually flows, the simple formulas, and the common scenarios that confuse small businesses operating in VAT jurisdictions.
Key Takeaways
- VAT is collected at every stage of production but is ultimately borne by the end consumer.
- Businesses collect output VAT on sales and reclaim input VAT on purchases. They pay the difference to the tax authority.
- VAT rates vary widely: typically 5–25% in countries that use it. The U.S. does not have federal VAT but uses sales tax.
- To add VAT: multiply by (1 + rate). To remove VAT: divide by (1 + rate).
- VAT registration is usually mandatory above a revenue threshold; voluntary registration may be beneficial below it.
The Basic Mechanic
Consider a simplified three-stage supply chain producing a wooden chair, with a 20% VAT rate (typical in much of Europe):
Stage 1: Forester sells lumber. Sells lumber for €100 net. Charges €20 VAT. Total invoice: €120. Forester remits €20 to the tax authority.
Stage 2: Furniture maker buys lumber, builds chair, sells to retailer. Paid €120 (€100 + €20 VAT on input). Sells chair for €300 net, charges €60 VAT. Total invoice: €360.
Furniture maker's VAT calculation:
- Output VAT (collected from retailer): €60
- Input VAT (paid to forester): €20
- Net VAT owed: €40
Stage 3: Retailer buys chair, sells to consumer. Paid €360 (€300 + €60 VAT on input). Sells chair to consumer for €500 net, charges €100 VAT. Total invoice: €600.
Retailer's VAT calculation:
- Output VAT (collected from consumer): €100
- Input VAT (paid to furniture maker): €60
- Net VAT owed: €40
Total VAT collected by the tax authority: €20 + €40 + €40 = €100.
That €100 is exactly 20% of the consumer's net price of €500. The tax was collected in three pieces along the chain, but only the final consumer truly paid it. Every business in between was a net-zero collector.
The Formulas
Add VAT to a net price: Gross price = Net price × (1 + VAT rate)
A €200 net item at 20% VAT: 200 × 1.20 = €240 gross.
Remove VAT from a gross price (reverse VAT): Net price = Gross price ÷ (1 + VAT rate)
A €240 gross item at 20% VAT: 240 ÷ 1.20 = €200 net.
Calculate VAT alone from gross: VAT amount = Gross price × VAT rate ÷ (1 + VAT rate)
A €240 gross item at 20% VAT: 240 × 0.20 ÷ 1.20 = €40 VAT.
These three formulas handle nearly every VAT calculation a business needs.
Common VAT Rates Worldwide
| Country / Region | Standard VAT Rate |
|---|---|
| United Kingdom | 20% |
| France | 20% |
| Germany | 19% |
| Spain | 21% |
| Italy | 22% |
| Netherlands | 21% |
| Ireland | 23% |
| Sweden | 25% |
| Australia (GST) | 10% |
| Canada (GST/HST varies by province) | 5–15% |
| United States | No federal VAT; state-level sales tax instead (0–10%) |
| UAE | 5% |
| Singapore (GST) | 9% |
Many countries also operate reduced rates for essentials (food, children's items, books) and zero rates for certain exports and pharmaceuticals.
Input vs Output VAT in Practice
A VAT-registered business runs the following cycle each reporting period (monthly or quarterly):
- Sum output VAT from all sales invoices issued.
- Sum input VAT from all purchase invoices received (and properly documented).
- Subtract input from output.
- If positive, pay the difference to the tax authority.
- If negative, claim a refund (or carry forward, depending on jurisdiction).
A small consultancy with €30,000 in sales (output VAT €6,000 at 20%) and €5,000 in eligible business expenses (input VAT €1,000) owes €5,000 net VAT for the period.
Eligible inputs typically include: business equipment, professional services, office supplies, rent (if VAT-applicable), and software subscriptions. Ineligible: most entertainment, certain client gifts, personal expenses, and items for non-VAT-taxable activities.
VAT Registration Thresholds
Most countries require VAT registration only above a revenue threshold:
- UK: £90,000 (2024–25 threshold) of VAT-taxable turnover in a 12-month rolling period
- Ireland: €37,500 (services) or €75,000 (goods)
- Germany: €22,000 (current year), with provisions for prior-year revenue
- Australia (GST): AU$75,000 (most businesses) or AU$150,000 (non-profits)
Below the threshold, registration is voluntary. Voluntary registration is worth considering when:
- Most customers are VAT-registered (they can reclaim, so the VAT is invisible to them)
- You have significant VAT on inputs you want to reclaim
- Being VAT-registered enhances credibility with B2B buyers
It is generally not worth registering when:
- Most customers are consumers or non-VAT-registered businesses (the added VAT hurts your prices)
- Your input VAT is minimal
Worked Example: A B2B Consultant Decision
A solo consultant in the UK earns £60,000/year, all from VAT-registered business clients. Annual VAT-eligible expenses: £6,000 (laptop, software, training, coworking).
Not registered:
- Charges £60,000 net (no VAT)
- Pays £1,200 in non-reclaimable VAT on £6,000 expenses
- Net keep: £58,800 (before income tax)
Voluntarily registered:
- Charges £60,000 + £12,000 VAT (clients reclaim, so they don't care)
- Pays £1,200 VAT on expenses, then reclaims it
- Remits £10,800 net VAT to HMRC
- Net keep: £60,000 (before income tax)
Voluntary registration nets an extra £1,200/year in this case, plus access to the simpler flat-rate VAT scheme for very small businesses in some jurisdictions.
For a consumer-facing business with the same revenue, voluntary registration would force a 20% price increase consumers cannot reclaim, usually a bad trade.
Common Mistakes
Confusing VAT with sales tax. Sales tax is collected only at the final sale; VAT is collected at every stage with reclaim mechanics. The total tax to the consumer is similar; the bookkeeping is very different.
Forgetting reverse-charge rules on cross-border B2B services. In many EU contexts, the buyer accounts for the VAT, not the seller. Misapplying this triggers penalties.
Reclaiming input VAT on ineligible expenses. Client entertainment, most cars, and certain personal-use items are typically excluded.
Missing the VAT threshold registration deadline. Crossing the threshold without registering on time triggers backdated VAT liability plus penalties.
Not separating VAT-taxable and exempt sales. Some business activities are VAT-exempt (financial services, certain healthcare). Input VAT on those activities is not reclaimable.
Calculating VAT on gross instead of net. A common spreadsheet error: applying the VAT rate to a gross price produces an inflated tax. Always work from net for "add VAT" and reverse-engineer for "remove VAT."
VAT vs Sales Tax: Quick Comparison
| Feature | VAT | Sales Tax (U.S.) |
|---|---|---|
| When collected | Every stage of production | Only at final retail sale |
| Reclaim mechanism | Yes (input VAT credit) | No |
| Who bears the cost | End consumer | End consumer |
| Common rates | 5–25% | 0–10% (state + local) |
| Compliance burden | Higher (every business in chain files) | Lower (only retailers file) |
| Cross-border B2B | Reverse charge mechanism | Use tax / sales tax exemption |
Both ultimately tax consumption. VAT is more compliance-heavy but produces less evasion because every stage has a paper trail. Sales tax is simpler but more exposed to under-reporting at the retail stage.
FAQ
What is the difference between VAT and sales tax? VAT is collected at every stage of production with reclaim credits along the way. Sales tax is collected only at the final retail sale. Total tax to the consumer is similar; bookkeeping is very different.
Do I have to register for VAT as a small business? Only if your VAT-taxable turnover exceeds the registration threshold in your country. Voluntary registration is allowed below the threshold and is often worth it for B2B-focused businesses.
Can I reclaim VAT on every business expense? No. Reclaim is generally limited to expenses directly tied to taxable business activities. Entertainment, personal-use items, and most car-related expenses are commonly excluded.
How do I calculate VAT from a gross price? VAT = Gross × Rate ÷ (1 + Rate). For 20% VAT on a €120 gross price: 120 × 0.20 / 1.20 = €20.
Is VAT charged on services or only goods? Both, with some exemptions. Most professional services are VAT-taxable; certain financial, medical, and educational services are VAT-exempt.
What happens if I charge VAT but am not registered? Charging VAT without registration is generally illegal. Customers cannot reclaim it, and you owe the collected amount to the tax authority without input credit.
Does VAT apply to digital products? Yes, with specific rules. Digital services to consumers (B2C) are typically VAT-charged at the customer's country rate. Cross-border B2B digital services often use the reverse charge mechanism.
Related Tools
The VAT Calculator handles both adding and removing VAT at any rate. The Sales Tax Calculator is the U.S. equivalent. For sale-price math, the Discount Calculator and Percentage Calculator cover the basics.
Related Articles
Final Thoughts
VAT looks like a tax on businesses; it is actually a tax on consumers, with businesses serving as collectors. Understanding the input-output cycle makes VAT registration decisions clearer and removes the mystery from the quarterly filing. The math is simple: multiply or divide by (1 + rate). The complexity lives in jurisdiction-specific exemptions, cross-border rules, and the discipline of separating VAT-taxable and non-VAT-taxable activity in your bookkeeping.