UK VAT Calculator
Add VAT to a net amount to get the gross total.
What this UK VAT calculator does
If you issue invoices, run an ecommerce store, freelance, or simply want to check receipts, a reliable UK VAT calculator saves time and prevents mistakes. This tool supports the three most common needs:
- Add VAT: Start with a net price and calculate gross total.
- Remove VAT: Start with a VAT-inclusive amount and find the net.
- Extract VAT: Identify how much VAT is included in a gross amount.
In the UK, VAT calculations are straightforward once you understand the formula, but people still get tripped up by rounding, reverse calculations, and choosing the right rate. The calculator above helps you do the math correctly in seconds.
Quick VAT formula reference
1) Add VAT to a net amount
Use this when your price is before tax:
- VAT amount = Net × (Rate ÷ 100)
- Gross amount = Net + VAT
2) Remove VAT from a gross amount
Use this when the price already includes VAT:
- Net amount = Gross ÷ (1 + Rate ÷ 100)
- VAT amount = Gross − Net
3) Extract VAT directly from gross
This gives the VAT component without manually doing two steps:
- VAT amount = Gross × Rate ÷ (100 + Rate)
UK VAT rates at a glance
The rate you use matters as much as the formula. The most commonly used UK rates are:
- 20% (Standard rate): Most goods and services.
- 5% (Reduced rate): Certain goods/services such as some energy-related supplies.
- 0% (Zero-rated): Specific goods like many basic food items, children’s clothing, and books.
Some supplies are also exempt (different from zero-rated). Exempt items are outside the normal VAT charging process. If you are unsure about classification, verify current HMRC guidance before invoicing.
Practical examples
Example A: Adding VAT
You sell a consulting service for £800 net at 20% VAT.
- VAT = £800 × 20% = £160
- Gross = £800 + £160 = £960
Example B: Removing VAT
You have a gross receipt of £240 at 20% VAT and need the net expense.
- Net = £240 ÷ 1.20 = £200
- VAT = £240 − £200 = £40
Example C: Reduced rate transaction
A qualifying item costs £150 net at 5% VAT.
- VAT = £150 × 0.05 = £7.50
- Gross = £157.50
When to use each calculator mode
- Add VAT mode: Best for creating quotations and issuing VAT-exclusive price lists.
- Remove VAT mode: Ideal for bookkeeping, expense reconciliation, and gross-to-net breakdowns.
- Extract VAT mode: Useful for quick checks when you only care about the VAT component.
Common VAT mistakes to avoid
Using the wrong base amount
Many errors happen because people accidentally apply VAT to a gross figure when they intended to use net (or vice versa). Always confirm whether your starting number is VAT-inclusive or VAT-exclusive.
Incorrect reverse VAT math
To remove 20% VAT, do not subtract 20% from the gross total. You must divide by 1.20 to get the true net.
Rounding inconsistencies
Small rounding differences can appear when line-by-line totals are compared with invoice totals. Use consistent rounding policy (typically two decimals in GBP) and stick to one method.
Rate assumptions
Not every sale is 20%. Some items are reduced-rate, zero-rated, exempt, or outside scope. Always check category treatment before invoicing.
VAT calculator FAQ
Is this calculator suitable for UK invoicing prep?
Yes. It is designed for quick UK VAT arithmetic and useful for drafting invoices, validating totals, and checking purchase receipts.
Can I use custom VAT rates?
Yes. Enter any rate in the VAT rate field, including decimal values, if needed for special scenarios or historical checks.
Does this replace professional tax advice?
No. This tool handles arithmetic only. For legal treatment, partial exemption, cross-border rules, or sector-specific VAT issues, consult HMRC guidance or a qualified tax professional.
Final thoughts
A dependable UK VAT calculator helps you work faster and with confidence. Whether you are pricing services, verifying invoices, or preparing accounts, accurate VAT handling protects margins and reduces compliance risk. Use the calculator whenever you need a fast, consistent net/VAT/gross breakdown.