About this calculator
The VAT Calculator adds VAT to a net price or removes VAT from a gross price. It is useful for invoices, quotes, receipts, ecommerce pricing, contractor bills, and checking supplier figures. UK VAT is usually shown separately for business transactions, so knowing the net amount, VAT amount, and gross amount helps prevent pricing mistakes. The calculator can also help when comparing VAT-inclusive consumer prices with VAT-exclusive business prices.
VAT formulas
VAT is calculated as a percentage of the net price. To remove VAT, divide the gross price by one plus the VAT rate.
- VAT amount = net price x VAT rate
- Gross price = net price x (1 + VAT rate)
- Net price = gross price / (1 + VAT rate)
How the calculator works
- Choose whether you want to add VAT or remove VAT.
- Enter the amount and VAT rate.
- The calculator separates the net amount, VAT amount, and gross amount.
- Use the result in invoices, quotes, or price checks.
Worked examples
Add standard VAT
Input: Net price GBP 100, VAT 20%
Calculation: 100 x 0.20 = 20; 100 + 20 = 120
Result: VAT is GBP 20 and gross price is GBP 120
Remove standard VAT
Input: Gross price GBP 120, VAT 20%
Calculation: 120 / 1.20 = 100
Result: Net price is GBP 100 and VAT is GBP 20
Reduced rate
Input: Net price GBP 200, VAT 5%
Calculation: 200 x 0.05 = 10
Result: VAT is GBP 10 and gross price is GBP 210
What VAT means
VAT is a tax charged on many goods and services. VAT-registered businesses usually charge VAT on taxable sales and may reclaim VAT on eligible business purchases. Consumers normally see the VAT-inclusive price, while business quotes often show prices before VAT.
A VAT calculator is useful because adding VAT and removing VAT are not mirror-image percentage operations. To remove 20% VAT from a gross price, divide by 1.20 rather than subtracting 20%.
VAT amounts on invoices and quotes
A clear VAT calculation separates the net amount, VAT amount, and gross amount. This matters for quotes, invoices, receipts, bookkeeping, and margin calculations.
- Net amount
- The price before VAT is added.
- VAT amount
- The tax charged at the applicable VAT rate.
- Gross amount
- The final VAT-inclusive price paid by the customer.
- Reduced, zero, and exempt supplies
- Some supplies use reduced or zero rates, while exempt supplies follow different rules. The correct VAT treatment depends on what is being sold.
VAT for business decisions
VAT affects cash flow as well as pricing. A business may collect VAT from customers before paying it to HMRC, or pay VAT on purchases before reclaiming it. The calculator helps with individual amounts, but full VAT return calculations need proper records and scheme-specific rules.
Adding VAT vs removing VAT
Adding VAT starts with the net price. Removing VAT starts with the gross price. At 20% VAT, adding VAT means multiplying by 1.20. Removing VAT means dividing by 1.20. Subtracting 20% from the gross price gives the wrong net amount because the VAT is 20% of the net amount, not 20% of the gross amount.
VAT rates and business context
The UK standard VAT rate is commonly 20%, but some goods and services may be reduced-rated, zero-rated, exempt, or outside the scope of VAT. The correct treatment depends on the supply, the customer, the place of supply, and the business circumstances.
VAT and pricing strategy
VAT registration can affect how prices feel to customers. A VAT-registered business selling to consumers may need to absorb VAT or increase prices. A business selling mainly to VAT-registered customers may find VAT less of a pricing barrier because customers may reclaim input VAT where eligible.
Common mistakes and edge cases
- Removing 20% from a gross price instead of dividing by 1.20.
- Using the standard rate when a reduced or zero rate applies.
- Confusing VAT-exempt and zero-rated supplies.
- Quoting business prices without stating whether VAT is included.
Limitations
This calculator provides an estimate only and is not financial or tax advice.
- VAT liability depends on the supply, customer, location, registration status, and scheme rules.
- Check HMRC guidance or an accountant for VAT return decisions.
Frequently asked questions
How do I add 20% VAT?
Multiply the net amount by 1.20 to get the gross amount including VAT.
How do I remove 20% VAT?
Divide the VAT-inclusive amount by 1.20 to find the net amount.
Is zero-rated the same as exempt?
No. Zero-rated supplies are taxable at 0%, while exempt supplies sit outside VAT in a different way.
Should invoices show VAT separately?
VAT-registered businesses usually need to show VAT information on VAT invoices.
Can this calculate my VAT return?
No. It calculates VAT on entered amounts, not full VAT return rules.
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