METHOD & GUIDANCE
How this calculation works
Enter figures from the same period and on a consistent VAT-inclusive or VAT-exclusive basis. Tool IQ recalculates every output immediately; nothing you enter is saved or sent to us.
How to use the result
Choose the rate that applies to the supply and keep the net, tax and gross amounts distinct when pricing or checking an invoice.
Worked example
At the default 20% rate, 100 net produces 20 VAT and a 120 gross total before any quantity or discount change.
Common mistakes
- Assuming the standard rate applies to every supply.
- Applying a discount after tax when it is actually pre-tax.
- Using this planning result as a substitute for filing guidance.
Frequently asked questions
Is this calculator free?
Yes. It requires no account and stores no calculation inputs.
Can I use the answer for a formal filing?
No. It is a planning estimate, not accounting, tax, legal or investment advice. Confirm material decisions with a qualified professional.
Should I include VAT?
Use a consistent basis throughout. Businesses that recover input tax commonly model net figures; consumer-facing prices are often considered gross.
Continue the decision
- Profit Margin Calculator — See profit, margin and markup from one sale.
- Freelance Rate Calculator — Turn an income goal into a sustainable day rate.
Method reviewed 26 July 2026. Figures are illustrative and calculated locally in your browser.