£400 plus VAT
£400 plus 20% VAT is £480. The standard-rate VAT on £400 is £80. Change the amount or rate in the calculator below.
To add UK VAT, multiply the net amount by 1 + (rate ÷ 100). At the standard 20% rate that is × 1.20, so £400 × 1.20 = £480, of which £80 is VAT.
UK VAT rates: 20% standard (most goods and services), 5% reduced (domestic energy, children's car seats), 0% zero-rated (most food, books, children's clothes). Zero-rated still appears on VAT returns; exempt supplies (insurance, finance, education) do not.
How it works.
Formula: net × (1 + rate ÷ 100) = gross.
- Convert the rate: 20 ÷ 100 = 0.20.
- VAT amount: £400 × 0.20 = £80.
- Gross: £400 + £80 = £480 (or £400 × 1.20).
Worked examples
£400 + 20% VAT = £480 — the standard-rate VAT is £80, added on top of the £400 net price.
On an invoice — quoting £400 net to a customer means billing £480 gross; you hand £80 to HMRC on your VAT return.
At the 5% reduced rate (domestic energy, children's car seats): £400 + 5% = £420, a VAT amount of £20.
Sources:
HMRC VAT rates
· retrieved 2026-06-18.
Frequently asked questions
How much is 20% VAT on £400?
The VAT is £80. Multiply the net amount by 0.20: £400 × 0.20 = £80. Add it to the net price and the gross (VAT-inclusive) total is £480.
What is £400 plus VAT?
£480. To add standard-rate VAT, multiply by 1.20: £400 × 1.20 = £480. The 1.20 multiplier is the same as adding 20%.
What if the reduced 5% rate applies to £400?
Some supplies (domestic energy, children's car seats, some mobility aids) are charged at 5%, not 20%. At 5%, the VAT on £400 is £20 and the gross is £420.