METHOD & GUIDANCE
How this calculation works
Enter figures from the same period and on a consistent sales tax-inclusive or sales tax-exclusive basis. Tool IQ recalculates every output immediately; nothing you enter is saved or sent to us.
How to use the result
Begin with the most likely case, then test a cautious case. Change one assumption at a time to reveal which input has the greatest effect.
Worked example
The calculator opens with a complete example. Replace each figure with your own and compare more than one scenario.
Common mistakes
- Mixing figures that include sales tax with figures that exclude it.
- Using an optimistic forecast as the only scenario.
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 sales tax?
Use a consistent basis throughout. Businesses that recover input tax commonly model net figures; consumer-facing prices are often considered gross.
Continue the decision
- Sales Tax Calculator — Add or remove sales tax with a clear breakdown.
- Target Pricing Calculator — Find the price needed to achieve a target margin.
- Cash Flow Forecast Calculator — Project closing cash from collections, payments and one-off movements.
Method reviewed 26 July 2026. Figures are illustrative and calculated locally in your browser.