UK VAT Calculator
Last updated: 5 July 2026
Reviewed by Gavin Meiring, Lead research and primary author · Doctoral Candidate (Corporate Governance) · Research and drafting assisted by AI
- France was the first country in the world to introduce VAT, launching its 'taxe sur la valeur ajoutée' in 1954 under the tax official Maurice Lauré.
- UK VAT arrived on 1 April 1973, the day Britain joined the European Economic Community, replacing the older Purchase Tax with an initial rate of 10%.
- Value Added Tax is now used by more than 170 countries, making it one of the most widespread taxes ever devised.
UK VAT Calculator
A UK VAT calculator adds or removes Value Added Tax from a price, based on the applicable VAT rate. It is used by businesses, sole traders, and consumers who need to work out the VAT component of a price, check an invoice, or prepare a VAT return.
How to Use the UK VAT Calculator
- Enter the amount you want to calculate VAT on.
- Select whether the amount is exclusive of VAT (the net price, before tax) or inclusive of VAT (the gross price, including tax).
- Select the VAT rate: standard (20%), reduced (5%), or zero (0%).
- Click calculate to see the net amount, VAT amount, and gross amount.
The Formula
To add VAT to a net (ex-VAT) price:
VAT amount = Net price x (VAT rate / 100)
Gross price = Net price + VAT amount
Or simply: Gross price = Net price x (1 + VAT rate / 100)
To remove VAT from a gross (inc-VAT) price:
Net price = Gross price / (1 + VAT rate / 100)
VAT amount = Gross price - Net price
At the standard 20% rate: divide the gross price by 1.2 to get the net price. At the 5% rate: divide by 1.05.
Real-World Example
A sole trader buys office equipment with an invoice total of £480 including VAT at 20%.
- Net price: £480 / 1.2 = £400
- VAT amount: £480 - £400 = £80
As a VAT-registered business, they can reclaim the £80 input VAT on their next VAT return, making the effective cost £400.
If the same trader sells a service for £350 net, they must charge 20% VAT:
- VAT amount: £350 x 0.20 = £70
- Invoice total: £350 + £70 = £420
UK VAT Rates and Exemptions
The UK has three main rates. The standard rate of 20% applies to most goods and services. The reduced rate of 5% applies to specific categories including domestic energy (gas and electricity), children's car seats, and certain health products. The zero rate (0%) applies to most food, children's clothing, books, newspapers, and some construction work; technically zero-rated goods are taxable but at 0%, which means suppliers can still reclaim input VAT. Some goods and services are VAT-exempt entirely (financial services, education, healthcare); suppliers of exempt services cannot reclaim input VAT on their costs. The VAT registration threshold is currently £90,000 in annual taxable turnover. Once you exceed this threshold, you must register for VAT within 30 days. Voluntary registration is available below the threshold and can be beneficial if you supply businesses that can reclaim the VAT.
Rates and the Two Directions
| Rate | On a £120 net figure | On a £120 VAT-inclusive figure |
|---|---|---|
| Standard, 20% | VAT £24.00, total £144.00 | net £100.00, VAT £20.00 |
| Reduced, 5% | VAT £6.00, total £126.00 | net £114.29, VAT £5.71 |
| Zero, 0% | VAT £0.00, total £120.00 | net £120.00, VAT £0.00 |
Adding VAT multiplies the net figure by 1.20 or by 1.05. Taking it out divides the inclusive figure by the same number. Applying 20% to a £120 inclusive total returns £24.00, which is £4.00 more than the correct £20.00, because the rate applies to the net amount and not to the total.
Rates, Rounding and Scope
The standard rate of VAT is 20% and the reduced rate is 5% at the time of writing in September 2026. Rates change, and a change makes the arithmetic on this page wrong, so confirm the current rates on the HMRC website before quoting a figure.
Zero-rated goods are taxable in principle and carry a 0% rate. Exempt sales are treated differently: zero-rated sales count toward taxable turnover and the input VAT behind them can usually be reclaimed, while exempt sales do neither, and a business that makes both kinds of sale can face a restriction on how much input VAT it recovers.
VAT is normally rounded to the nearest penny per line on an invoice, and the calculator handles one line at one rate. A mixed basket needs a calculation per rate with the totals added afterwards. The tool does not model partial exemption, the flat rate scheme, margin schemes or the treatment of imports, all of which change the amount a business actually pays over.
A Worked Invoice, Line by Line
A business sells three lines at three rates on one invoice. The net amounts are £250 of standard-rated goods, £80 of reduced-rated goods and £40 of zero-rated goods.
| Line | Net | Rate | VAT | Line total |
|---|---|---|---|---|
| Standard goods | £250.00 | 20% | £50.00 | £300.00 |
| Reduced goods | £80.00 | 5% | £4.00 | £84.00 |
| Zero-rated goods | £40.00 | 0% | £0.00 | £40.00 |
| Invoice total | £370.00 | £54.00 | £424.00 |
One rate per line, VAT rounded to the nearest penny on the line, and the line totals added afterwards. Applying 20% to the invoice total of £424.00 returns £84.80, and applying it to the net total of £370.00 returns £74.00. The correct figure is £54.00, so both shortcuts overstate the tax by £30.80 and £20.00 respectively.
Frequently Asked Questions
What is the difference between zero-rated and VAT-exempt? Zero-rated means VAT is charged at 0%, but the supply is still technically taxable. A zero-rated supplier can reclaim the input VAT they paid on their own purchases. VAT-exempt means the supply falls outside the VAT system entirely; an exempt supplier cannot reclaim input VAT, which can make them less competitive when selling to VAT-registered businesses.
When do I need to register for VAT? You must register if your taxable turnover in any rolling 12-month period exceeds £90,000, or if you expect it to exceed this threshold in the next 30 days. You can also register voluntarily below the threshold, which allows you to reclaim VAT on business purchases. Registration is generally beneficial if most of your customers are VAT-registered businesses.
Can I reclaim VAT on all business purchases? You can reclaim VAT (input tax) on most goods and services purchased for business use. Exceptions include business entertainment, cars (unless used exclusively for business), and goods used partly for personal purposes (for which you can only reclaim the business-use proportion). Input VAT cannot be reclaimed on purchases related to VAT-exempt activities.
How often do I need to submit a VAT return? Most VAT-registered businesses submit returns quarterly, although monthly and annual accounting schemes are also available. Under Making Tax Digital (MTD), VAT returns must be submitted digitally using compatible accounting software linked directly to HMRC. The deadline for submitting and paying is usually one month and seven days after the end of the VAT period.
Also try these free tools:
Extended Reference Notes
The notes below cover the broader context that informs how to use the UK VAT Calculator well.
Typical Input Ranges
Most real-world uses of the UK VAT Calculator fall into a middle band where the result is stable and useful. Very small inputs to the UK VAT Calculator often round to zero or near-zero, and very large inputs amplify every rounding error in the calculation. The middle band, where the UK VAT Calculator inputs are ordinary sizes, is where the tool is most reliable.
Assumptions Behind the Formula
The UK VAT Calculator assumes the inputs stay fixed across the period or scenario being modelled. Rates move, values change, and fees appear, so treat the UK VAT Calculator output as a clean reference and layer in the frictions your own situation adds.
Common Edge Cases
Three situations change the UK VAT Calculator answer in ways the formula does not surface: boundary values near zero, rounding cascades across many steps, and unit mismatches between fields. When any of these apply, sanity-check the UK VAT Calculator result against an independent estimate.
When to Revisit the Calculation
The UK VAT Calculator output is only as current as its inputs, so re-run the calculation whenever a key value changes materially. A quarterly re-check of the UK VAT Calculator suits personal planning; monthly suits active business or investment decisions.
Relationship to Other Tools
The UK VAT Calculator shares inputs and outputs with the other tools in its category. If the same numbers feed several tools, capture them once and run each tool so the comparison stays consistent with the UK VAT Calculator.
Practical Checklist Before Relying on the Result
Before acting on the UK VAT Calculator output, run a short mental checklist: inputs in the right units, direction of the result matching intuition, and magnitude plausible. Each check takes seconds and catches the most common classes of UK VAT Calculator error before they reach a decision.
Putting the Result to Work
A single UK VAT Calculator run usually narrows the range of plausible answers rather than settling the question. Compare the UK VAT Calculator result against a benchmark or a previous run, and ask what would have to change for the answer to flip a decision.
Sensitivity to Inputs
Some inputs move the UK VAT Calculator result more than others; changing each by a small amount shows which ones matter. Spend the effort on the high-impact UK VAT Calculator inputs and treat the low-impact ones as approximate.
A Note on Stale Inputs
A calculation is only as fresh as the inputs that feed it, so note the date the UK VAT Calculator inputs were last refreshed. A six-month-old UK VAT Calculator result can be as wrong as a wrong calculation when the underlying values have moved on.