VAT invoice total calculator UK
Build a simple invoice subtotal, discount, VAT amount and gross total. Check the formula, worked example and limits before using your own figures.
Enter your figures
Gross invoice total
Inputs changed. Select Calculate result to update your estimate.
Use your actual figures. Any prefilled price, fee, rate or return is an editable illustration, not a current product quote. One VAT rate and one discount. Rounding at line or invoice level can differ; this is not a compliant invoice generator or VAT eligibility decision.
How the vat invoice total calculator uk works
Net subtotal = quantity × unit price × (1 − discount). VAT is charged on the discounted net amount.
UK data and rules
2026/27 data · Checked 16 October 2026. Rules are a dated snapshot, not a live feed.
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Worked example: vat invoice total
This illustration uses the calculator’s example inputs. It is not a quote or a recommended financial decision.
- Quantity
- 10
- Unit price before VAT (£)
- 25
- Invoice discount (%)
- 10
- VAT rate (%)
- 20
Gross invoice total: £270.00
Net subtotal = quantity × unit price × (1 − discount). VAT is charged on the discounted net amount.
VAT invoice total: questions answered
What does the vat invoice total calculation include?
Net subtotal = quantity × unit price × (1 − discount). VAT is charged on the discounted net amount. Use your actual figures. Any prefilled price, fee, rate or return is an editable illustration, not a current product quote. One VAT rate and one discount. Rounding at line or invoice level can differ; this is not a compliant invoice generator or VAT eligibility decision.
Using your result
Example inputs are a starting point. Replace them with your figures and select Calculate result. Results are rounded for display; calculations use unrounded values.
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