Understanding the VAT formula is essential for calculating VAT correctly in the UK.
Whether you are adding VAT to a price or removing it, using the correct formula ensures accuracy. This guide explains the standard VAT formulas used in the UK and how to apply them step-by-step.
The VAT formula in the UK depends on whether you are adding or removing VAT.
To add VAT, multiply the net price by 1.20.
To remove VAT, divide the total price by 1.20.
What is the VAT formula?
The VAT formula is used to calculate the amount of VAT added to goods and services.
In the UK, the standard VAT rate is 20%, and this is used in most calculations.
Add VAT formula:
Net price × 1.20 = Total price including VAT
Remove VAT formula:
Total price ÷ 1.20 = Net price
VAT amount formula:
Total price − Net price = VAT amount
Examples:
£100 × 1.20 = £120 (including VAT)
£120 ÷ 1.20 = £100 (excluding VAT)
VAT amount = £20
🧮 CORE FORMULA — ADDING VAT
Total Price (Inc. VAT) = Net Price × 1.20
How to Add VAT Using the Formula
To add VAT to a price, multiply the net amount by 1.20.
Example:
£100 × 1.20 = £120
How to Remove VAT Using the Formula
To remove VAT from a price, divide the total price by 1.20.
Example:
£120 ÷ 1.20 = £100
How to Calculate the VAT Amount Only
To calculate just the VAT portion, multiply the net price by 0.20.
Example:
£100 × 0.20 = £20 VAT
VAT Formula for Different Rates
While 20% is the standard rate, other VAT rates may apply.
For example:
- 5% VAT → multiply by 1.05
- 0% VAT → no VAT added
Always use the correct rate when applying the formula.
Step-by-Step VAT Calculation Using Formulas
To calculate VAT using formulas:
- Identify the VAT rate
- Determine if VAT needs to be added or removed
- Apply the correct formula
- Check your calculation
Tip: Using the correct formula for your situation ensures accurate VAT calculations every time.
Common VAT Formula Mistakes
Common mistakes include:
- Using the wrong multiplier
- Confusing gross and net prices
- Applying the wrong VAT rate
Double-checking your formula helps avoid errors.
Use a VAT calculator instead.
While formulas are useful, a VAT calculator can make the process faster and more accurate.
Use our VAT calculator to instantly calculate VAT on any amount.
VAT Formula FAQs
What is the VAT formula in the UK?
Multiply by 1.20 to add VAT or divide by 1.20 to remove it.
How do I calculate VAT quickly?
Using a calculator is the fastest method.
Does the VAT formula change?
Only if a different VAT rate applies.
You may also find these helpful:
VAT Calculator UK
Add VAT Calculator
Reverse VAT Calculator
These tools help you calculate VAT instantly using the correct formulas.
Disclaimer
This guide is for general information only. While every effort is made to ensure accuracy, we are an independent resource and not affiliated with HMRC. Always consult a qualified professional for financial decisions.