To calculate VAT (Value Added Tax), you multiply the net amount by the VAT rate and add the result to the net amount. For example, adding 20% VAT to £100 gives £120. If you have the gross amount and need the net, divide by 1 plus the VAT rate. Use a VAT calculator to save time and avoid errors when working with different rates.
Understanding how to calculate vat
VAT is a consumption tax added to the price of goods and services. The standard rate in the UK is 20%, but reduced rates (5%) and zero rates (0%) apply to certain items. Businesses must charge VAT on taxable supplies unless they are exempt or outside the scope of VAT altogether.
When you add VAT, you increase the net price by the applicable percentage. For instance, £50 + 20% VAT equals £60. To remove VAT from a gross amount, divide by 1 plus the VAT rate (e.g., £60 ÷ 1.20 = £50 net). The method is the same regardless of the VAT rate, though the final figure will differ.
How to work it out, step by step
- Enter the amount.
- Enter the VAT / sales tax rate for your country.
- Choose whether to add tax to a net price or remove it from a gross price.
- See the tax and the net / gross totals.
Add: Tax = Net × rate% · Remove: Net = Gross ÷ (1 + rate%)Why it matters
Getting VAT calculations right is essential for businesses to comply with HMRC rules, avoid penalties, and price products accurately. Consumers also benefit from clear pricing, while freelancers and small businesses need to track VAT correctly for their tax returns. Errors can lead to overcharging, lost revenue, or compliance issues.
Free tools for this
| Tool | What it does |
|---|---|
| VAT / Sales Tax Calculator | Add or remove VAT / sales tax at any rate and see the tax amount instantly. |
| Discount Calculator | Find the sale price and how much you save on any discount. |
| Profit Margin Calculator | Turn cost and selling price into profit, margin and markup percentages. |
Try the VAT / Sales Tax Calculator
Skip the manual maths — enter your numbers and get the answer instantly.
Open the VAT / Sales Tax Calculator →Good to know
Small differences in interest rate, term or timing can add up to large sums over the years. Before committing to any financial decision, run a few different scenarios so you can see the full picture and choose with confidence.
Key takeaways
- Add VAT by multiplying the net amount by (1 + VAT rate)
- Remove VAT by dividing the gross amount by (1 + VAT rate)
- Use a VAT calculator to handle different rates and avoid manual errors
Frequently asked questions
Why can’t I just subtract 20% to remove 20% VAT?
Because the 20% was added to the net price, not the gross one. Subtracting 20% from a gross 120 gives 96, but the true net is 100 and the VAT is 20. To reverse it you divide the gross by 1.20. This tool does that automatically in remove mode.
What rate should I enter?
Whichever rate applies to your country and to that specific product or service. We deliberately do not assume one: rates vary by jurisdiction, many countries apply reduced or zero rates to certain categories, and rates get changed. Check an official source rather than a default.
Does this work for GST and US sales tax?
The arithmetic is identical — any percentage tax added to a price behaves the same way. What differs is the rate and the rules around it. US sales tax in particular is set at state and local level, so the rate you need depends on location.
Can I find the tax already included in a receipt total?
Yes. Choose remove mode, enter the total from the receipt and the rate that applied. It will show the net price and how much of the total was tax.
Can it handle a basket with several different rates?
No. It applies one rate to one amount. For a mixed basket, run each rate group separately and add the results together.
