Our Reverse VAT calculator can help to get accurate vat results for people in the UK and other regions. It helps businesses and individuals work backward from a gross (including VAT) amount to find the net (before VAT) amount and the exact VAT amount included.
Reverse VAT Calculator
VAT Rate: 0%
Net Amount: 0
VAT Amount: 0
Gross Amount: 0
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Follow this simple step-by-step guide to calculate VAT accurately—whether you want to add or remove it.
Enter the Amount
In the calculator, you'll see an input field where you can enter the amount you want to calculate VAT for.
- If adding VAT: Enter the net amount (before VAT) in the field.
- If removing VAT: Enter the gross amount (including VAT) in the field.
Adjust the VAT Rate
The calculator displays a VAT rate slider, set to 20% by default. You can adjust it by moving the slider left or right.
- The VAT rate range is 7.5% to 25%—set it to any value within that range.
- As you move the slider, the percentage value updates on screen in real time.
Choose Add or Remove VAT
After entering the amount and setting the VAT rate, choose which operation you want to perform:
- Add VAT — Adds the VAT percentage to the net amount to get the gross total.
- Remove VAT — Extracts the VAT from the gross amount to find the net price.
View Results
Once you click either button, the results are displayed instantly in the breakdown section below:
Net Amount
Price before tax
VAT Amount
Calculated tax value
Gross Amount
Total inclusive price
Calculate Again
Once you have your results, click the Reset button at the bottom of the calculator. This clears all fields and results so you can start a fresh calculation instantly.
A complete breakdown of the formulas and logic used to add or remove VAT—with worked examples for each.
Key Terms
Net Amount
The original price before VAT is added. This is the base amount used in calculations.
Gross Amount
The total price after VAT has been added. This includes both net amount and the tax element.
VAT Amount
The value of tax applied—calculated as the mathematical difference between gross and net amounts.
VAT Rate
The percentage rate applied (e.g., 20% standard UK rate). Adjustable via the slider or presets.
Net Amount → Gross Amount
Use this formula when you have a price before tax and want to find the total inclusive price.
Worked Example (Net £100 @ 20%)
Gross Amount → Net Amount
Use this formula when you have a VAT-inclusive total price and want to extract the base net price.
Worked Example (Gross £120 @ 20%)
Frequently Asked Questions
Below are clear answers to the most common questions about reverse VAT, UK VAT rates, adding VAT, removing VAT, and using a VAT calculator for personal or business use.
Reverse VAT means working backwards from a total price that already includes VAT. To calculate it, divide the gross amount by 1 + the VAT rate.
For example, if the total is £120 and VAT is 20%, then £120 ÷ 1.20 = £100. The VAT amount is £20.
This is the correct way to remove VAT from a VAT-inclusive price.
The standard VAT rate in the UK is 20%. There is also a reduced rate of 5% and a zero rate of 0% for certain qualifying goods and services. [Source](https://www.gov.uk/vat-rates)
Most goods and services normally use the standard 20% VAT rate.
To add VAT to a price, multiply the original amount by 1 + the VAT rate.
For example, if the net price is £100 and VAT is 20%, then £100 × 1.20 = £120. [Source](https://www.gov.uk/charge-reclaim-record-vat)
You can also calculate the VAT separately first, then add it to the original amount.
To remove VAT from a gross price, divide the total by 1 + the VAT rate.
If the gross amount is £120 and VAT is 20%, then £120 ÷ 1.20 = £100. The VAT included is £20. [Source](https://www.gov.uk/charge-reclaim-record-vat)
The current standard UK VAT rate is 20%. The reduced rate is 5%, and some qualifying items are zero-rated at 0%. [Source](https://www.gov.uk/vat-rates)
Always use the correct rate for the product or service you are calculating.
The VAT registration threshold in the UK is £90,000 in taxable turnover. [Source](https://www.gov.uk/register-for-vat)
A business usually needs to register for VAT if its taxable turnover goes above £90,000 in the last 12 months, or if it expects to go over that amount in the next 30 days. [Source](https://www.gov.uk/register-for-vat)
A reverse VAT calculation means taking a total amount that already includes VAT and working backwards to find the original net amount and the VAT portion inside it.
It is also often called a VAT backwards calculation or reverse calculate VAT.
Net is the original price before VAT is added. Gross is the final price after VAT has been added.
For example, if the net amount is £100 and VAT is 20%, the gross amount becomes £120.
Simply subtracting 20% is wrong because a VAT-inclusive total is already 120% of the net amount, not 100%.
For example, if the total is £120, subtracting 20% gives £96, which is incorrect.
The correct method is £120 ÷ 1.20 = £100.
Zero-rated means VAT applies at 0%. The sale is still within the VAT system, but no VAT is charged to the customer.
VAT exempt means no VAT is charged, but the supply is treated differently under VAT rules. These two things are not the same. [Source](https://www.gov.uk/charge-reclaim-record-vat/when-not-to-charge-vat)
Yes, this VAT calculator can be used by business owners, freelancers, contractors, accountants, and bookkeepers for quick day-to-day VAT calculations.
It is useful for checking invoices, comparing gross and net prices, removing VAT, and verifying reverse VAT amounts.
For unusual or complex VAT cases, it is still a good idea to confirm with your accountant.