VATCalculator UK

£4,500 plus VAT

£4,500 plus 20% VAT is £5,400. The standard-rate VAT on £4,500 is £900. Change the amount or rate in the calculator below.

Enter values above to calculate.

To add UK VAT, multiply the net amount by 1 + (rate ÷ 100). At the standard 20% rate that is × 1.20, so £4,500 × 1.20 = £5,400, of which £900 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.

  1. Convert the rate: 20 ÷ 100 = 0.20.
  2. VAT amount: £4,500 × 0.20 = £900.
  3. Gross: £4,500 + £900 = £5,400 (or £4,500 × 1.20).
Worked examples
£4,500 + 20% VAT = £5,400 — the standard-rate VAT is £900, added on top of the £4,500 net price.
Contractor invoice — £4,500 of labour or materials net becomes £5,400 gross; a VAT-registered client reclaims the £900 as input VAT.
At the 5% reduced rate (domestic energy, children's car seats): £4,500 + 5% = £4,725, a VAT amount of £225.
Related: Remove VAT from £5,400 £4,000 plus VAT £5,000 plus VAT VAT amount tables
Sources: HMRC VAT rates · retrieved 2026-06-18.

Frequently asked questions

How much is 20% VAT on £4,500?
The VAT is £900. Multiply the net amount by 0.20: £4,500 × 0.20 = £900. Add it to the net price and the gross (VAT-inclusive) total is £5,400.
What is £4,500 plus VAT?
£5,400. To add standard-rate VAT, multiply by 1.20: £4,500 × 1.20 = £5,400. The 1.20 multiplier is the same as adding 20%.
Can I reclaim the VAT on £4,500?
If you are VAT-registered and the purchase is for your business, you can usually reclaim the £900 input VAT on your next return — so the real cost is the £4,500 net. Unregistered businesses and consumers cannot reclaim it.