Invoice Calculator
Calculate an invoice subtotal, VAT and total.
Subtotal
£100.00
- VAT
- £20.00
- Invoice total
- £120.00
Enter the VAT rate that applies to your goods or services. This does not determine whether you need to register for VAT.
v1.0 · Reviewed September 2026
How this is worked out
The subtotal is price × quantity. VAT is the subtotal × the VAT rate you enter, and the total adds the two together.
Worked example
- Price per item £100.00
- Quantity 1
- VAT rate 20%
subtotal 100, VAT 20, total 120
£100.00 subtotal, £20.00 VAT, £120.00 total
Assumptions and limits
- Treats the price entered as excluding VAT.
- Uses the rate you choose. It does not decide whether your supply is standard rated, reduced rated, zero rated or exempt, and it does not decide whether you must register for VAT.