How to calculate VAT from gross UK prices
Use this interactive calculator to work backwards from a gross amount and instantly estimate the net amount and VAT included under common UK VAT rates. It is ideal for invoices, receipts, pricing checks, bookkeeping, and quick business calculations.
Enter a gross amount and click Calculate to see the VAT breakdown.
How to calculate VAT from gross UK totals accurately
If you are trying to work out how much VAT is included in a total price, you are asking a very common accounting and pricing question: how do you calculate VAT from a gross amount in the UK? The answer is simple once you know the right formula. In UK VAT terminology, the gross amount is the price including VAT, while the net amount is the price before VAT. The VAT amount is the difference between the two.
Many people make the mistake of simply multiplying the gross amount by 20% to find the VAT at the standard rate. That approach is wrong when the gross price already includes VAT, because the VAT portion is embedded inside the total. Instead, you first remove the VAT element to identify the pre-VAT value. Once you understand that distinction, your calculations become much more reliable for invoices, expense claims, bookkeeping entries, and price comparisons.
Core rule: If the amount already includes VAT, divide by the VAT-inclusive factor. For standard-rate UK VAT, divide the gross amount by 1.20 to get the net amount, then subtract the net from the gross to get the VAT.
The exact formula for VAT from a gross amount
The formula depends on the VAT rate being applied. In the UK, the most common rates are 20% and 5%, with some goods and services zero-rated. If the gross amount includes VAT, use the following steps:
- Identify the VAT rate.
- Convert the percentage rate into a multiplier.
- Divide the gross amount by that multiplier to get the net amount.
- Subtract the net amount from the gross amount to get the VAT amount.
Here are the formulas in plain English:
- Net amount = Gross amount ÷ (1 + VAT rate)
- VAT amount = Gross amount − Net amount
For UK rates, that usually means:
- 20% VAT: Net = Gross ÷ 1.20
- 5% VAT: Net = Gross ÷ 1.05
- 0% VAT: Net = Gross
Worked examples for common UK VAT rates
Let us look at a few examples so the method is clear.
Example 1: Gross £120 at 20% VAT
Net = £120 ÷ 1.20 = £100
VAT = £120 − £100 = £20
Example 2: Gross £48 at 20% VAT
Net = £48 ÷ 1.20 = £40
VAT = £48 − £40 = £8
Example 3: Gross £105 at 5% VAT
Net = £105 ÷ 1.05 = £100
VAT = £105 − £100 = £5
Example 4: Gross £250 at 20% VAT
Net = £250 ÷ 1.20 = £208.33
VAT = £250 − £208.33 = £41.67
This is why calculators are useful. As soon as the number is not neatly divisible, rounding becomes relevant. Businesses often round to two decimal places because invoices are shown in pounds and pence, but internal systems may carry more precision depending on accounting rules.
Why multiplying gross by 20% gives the wrong answer
If a total of £120 already includes 20% VAT, multiplying £120 by 20% gives £24, but that is incorrect. The reason is that 20% VAT is charged on the net amount, not on the gross total. In this case, the net is £100 and 20% of £100 is £20. So the VAT portion is one-sixth of the gross amount when the VAT rate is 20%, not one-fifth.
A useful shortcut for standard-rate UK VAT is:
- VAT from gross at 20% = Gross ÷ 6
That shortcut works because if gross = net × 1.20, then VAT = gross × 20/120, which simplifies to gross ÷ 6. So if your receipt shows £60 including VAT, the VAT amount is £10 and the net amount is £50.
Quick comparison of formulas by VAT rate
| VAT rate | Gross to net formula | VAT formula from gross | Example gross |
|---|---|---|---|
| 20% | Gross ÷ 1.20 | Gross − (Gross ÷ 1.20) | £120 becomes £100 net + £20 VAT |
| 5% | Gross ÷ 1.05 | Gross − (Gross ÷ 1.05) | £105 becomes £100 net + £5 VAT |
| 0% | Gross ÷ 1.00 | £0 VAT | £100 remains £100 net + £0 VAT |
Current UK VAT rates and registration threshold
When calculating VAT from gross figures, it helps to remember the broader VAT context. According to HM Revenue and Customs, the standard UK VAT rate is 20%, while some goods and services are charged at a reduced rate of 5% or are zero-rated. HMRC also publishes the VAT registration threshold. As of current HMRC guidance, the taxable turnover threshold is £90,000.
| UK VAT fact | Current figure | Why it matters for gross calculations |
|---|---|---|
| Standard VAT rate | 20% | Most everyday calculations of VAT from gross use the 1.20 divisor. |
| Reduced VAT rate | 5% | Use the 1.05 divisor when the sale qualifies for the reduced rate. |
| VAT registration threshold | £90,000 taxable turnover | Businesses above the threshold generally need to account for VAT on taxable supplies. |
| Zero rate | 0% | Gross and net are the same, but the supply may still be taxable for VAT purposes. |
Those figures matter because people often confuse zero-rated and exempt transactions. A zero-rated sale can still sit within the VAT system, but no VAT is charged. An exempt supply is different. If you are reviewing a gross figure and trying to extract VAT, you need to first confirm that VAT was actually chargeable in the first place.
Step by step method you can use manually
If you want to calculate VAT from a gross amount without a calculator, follow this practical routine:
- Look at the invoice, receipt, or price and confirm it includes VAT.
- Check the applicable VAT rate for that item or service.
- Take the gross total and divide it by 1.20, 1.05, or 1.00 depending on the rate.
- Round the result appropriately to pounds and pence unless your accounting system requires a different precision.
- Subtract the net amount from the gross total.
- Record the net and VAT values separately for your accounts.
Common situations where this matters
- Expense claims: Staff often submit receipts showing only the total paid, and finance teams need to identify the VAT element.
- Retail pricing: Shops usually show VAT-inclusive prices to consumers, so businesses may need to split gross takings into net sales and VAT liability.
- Bookkeeping: Gross bank or card figures often need to be broken down before posting to accounts.
- Supplier invoices: If an invoice does not clearly state net and VAT, you may need to work backward from the total.
- Quotation checks: Comparing VAT-inclusive and VAT-exclusive quotes requires a clear conversion method.
Rounding and invoice accuracy
One of the most overlooked parts of VAT calculations is rounding. A gross amount such as £250 at 20% VAT gives a repeating decimal when you divide by 1.20. In most commercial settings, you round to two decimal places, which means the net becomes £208.33 and VAT becomes £41.67. However, line-level rounding and invoice-level rounding may produce slightly different penny results. That does not always mean the invoice is wrong, but it does mean you should use a consistent method across your records.
For very high-volume retail or ecommerce businesses, the difference between line-item rounding and total-invoice rounding can build up over time. This is why many accounting systems allow control over decimal precision and VAT handling rules. If you are doing ad hoc checks manually, stick with standard currency rounding unless your accountant or software requires more detailed precision.
VAT inclusive vs VAT exclusive pricing
Understanding the difference between gross and net pricing is fundamental:
- VAT exclusive price: The seller starts with the net amount and adds VAT on top.
- VAT inclusive price: The price already includes the VAT charge.
If a product costs £100 net and VAT is 20%, the gross is £120. If you later only have the £120 figure, you must reverse the process. That is exactly what this calculator does. It removes the VAT-inclusive factor and shows the underlying net amount.
Mistakes to avoid when calculating VAT from gross
- Do not multiply a VAT-inclusive amount by the VAT percentage and assume that gives the VAT element.
- Do not assume every transaction is charged at 20%.
- Do not confuse zero-rated with exempt supplies.
- Do not ignore rounding differences on multi-line invoices.
- Do not reclaim VAT without valid evidence if you are using the figure for business tax records.
Useful shortcut percentages
If you regularly extract VAT from VAT-inclusive totals, a few shortcuts can save time:
- 20% VAT: VAT is 16.67% of the gross amount, or gross ÷ 6.
- 5% VAT: VAT is approximately 4.76% of the gross amount.
These shortcuts can be useful for quick checks, but the safest method is still to divide gross by the VAT-inclusive multiplier, especially when accuracy matters for tax records.
Authority sources and further reading
GOV.UK: VAT rates on different goods and services
GOV.UK: Register for VAT
GOV.UK: VAT guide (Notice 700)
Final takeaway
To calculate VAT from gross in the UK, always start by confirming the correct VAT rate and whether the amount already includes VAT. Then divide the gross amount by 1.20 for standard rate transactions, 1.05 for reduced rate transactions, or 1.00 for zero-rated transactions. The result is the net figure. Subtract that from the gross total to identify the VAT amount. This reverse calculation is essential for receipts, expense claims, invoice checks, and bookkeeping accuracy.
Use the calculator above whenever you need a fast answer, and rely on official HMRC guidance where tax treatment is unclear. For simple arithmetic, the method is easy. For compliance decisions, the classification of the supply matters just as much as the maths.