Finance & Business
VAT Calculator
Calculate Value Added Tax (VAT) amounts and total prices for your business transactions.
Reviewed by the calculator.uk.com Team · Last reviewed 30 May 2026 · Our methodology
Enter values to calculate VAT
Related to VAT Calculator
The VAT Calculator helps you calculate Value Added Tax (VAT) amounts and total prices for business transactions. It supports both adding VAT to net amounts and removing VAT from gross amounts using standard mathematical formulas.
Adding VAT
When adding VAT to a net amount, the calculator multiplies the net amount by the VAT rate percentage to determine the VAT amount. The gross amount is then calculated by adding the VAT amount to the net amount. For example, with a 20% VAT rate: VAT Amount = Net Amount × 0.20, and Gross Amount = Net Amount + VAT Amount.
Removing VAT
When removing VAT from a gross amount, the calculator uses the formula: Net Amount = Gross Amount ÷ (1 + VAT Rate). The VAT amount is then calculated as the difference between the gross and net amounts. For example, with a 20% VAT rate: Net Amount = Gross Amount ÷ 1.20, and VAT Amount = Gross Amount - Net Amount.
The calculator provides three key values to help you understand the VAT breakdown of your transaction. Understanding these components is crucial for accurate business accounting and tax reporting.
Net Amount
This is the base price before VAT is applied. For businesses, this is typically the amount used for calculating profit margins and the value you use when recording sales or purchases excluding VAT.
VAT Amount
This is the actual tax amount that needs to be paid to or reclaimed from HMRC. The amount varies based on the applicable VAT rate (standard 20%, reduced 5%, or zero 0%).
Gross Amount
This is the total amount including VAT, representing the final price that customers pay. For businesses, this is the amount that should appear on invoices and receipts when selling to customers.
1. What are the different VAT rates in the UK?
The UK has three VAT rates: the standard rate of 20% (applied to most goods and services), a reduced rate of 5% (applied to certain goods and services like children's car seats and home energy), and a zero rate of 0% (applied to most food items, books, and children's clothes).
2. When should I use 'Add VAT' vs 'Remove VAT'?
Use 'Add VAT' when you have a net price (before VAT) and need to calculate the total amount including VAT. Use 'Remove VAT' when you have a gross price (including VAT) and need to calculate the original price before VAT was added.
3. Do all businesses need to charge VAT?
No, only businesses with an annual taxable turnover above the VAT threshold (currently £85,000 in the UK) must register for and charge VAT. However, businesses below this threshold can voluntarily register if they wish to reclaim VAT on their purchases.
4. How often do VAT rates change?
VAT rates are set by the government and can change as part of fiscal policy. The standard rate has been 20% since January 4, 2011. During exceptional circumstances, temporary rate changes may be implemented, as seen during the COVID-19 pandemic for certain sectors.
5. What is the scientific source for this calculator?
VAT is added or removed using standard percentage arithmetic — multiplying by (1 + rate) to add VAT, or dividing by (1 + rate) to extract the VAT already included in a gross price. Rates and the rules for what is standard-rated, reduced-rated, or zero-rated are set by HM Revenue & Customs (HMRC) under UK VAT legislation, which derives from the Value Added Tax Act 1994. Getting the direction of calculation right — adding VAT to a net price versus extracting it from a gross price — is the most common source of error, which is why this calculator handles both directions separately.