Example result based on the prefilled values.
Discount
A$0.00
Net
A$1,000.00
Tax
A$200.00
Total
A$1,200.00
Continue your plan
Useful next calculations
When to use this calculator
- Before pricing a job, setting margin targets, or reviewing hiring costs.
- When you want to test sensitivity around volume, VAT, markup, or overhead changes.
- When you need a practical estimate before committing to a budget or proposal.
- When you are modelling break-even volume and want to see how it shifts as overheads or prices change.
- When you are preparing a quote and need to verify that the margin holds after materials, labour, and VAT are accounted for.
A realistic Australia planning example
Use these sample inputs as a quick scenario test, then change one variable at a time to compare outcomes.
Subtotal (A$)
1000
VAT / Sales Tax Rate (%)
5%
Discount (%)
0
After entering these figures, review discount, net and tax together rather than in isolation — each metric tells a different part of the story. Then rerun the tool with one input adjusted to see which variable has the biggest effect on all three outputs before you settle on a plan.
How to read your results
Discount
Use this metric to compare scenarios side by side and understand how changes in the key inputs drive the final outcome. If the figure surprises you, isolate one variable at a time and rerun the calculation to identify which assumption is responsible.
Net
Use this metric to compare scenarios side by side and understand how changes in the key inputs drive the final outcome. If the figure surprises you, isolate one variable at a time and rerun the calculation to identify which assumption is responsible.
Tax
Review this figure alongside gross income and the local tax rules that apply to you. It is a planning estimate, not a filing result or a recommendation to make a tax decision.
Total
This is the headline outcome of the calculation, but it is most useful when read alongside the supporting metrics below it rather than in isolation. Try changing one input at a time and watching how this total moves to understand which driver has the biggest impact.
Method & assumptionsAuthoritative sources
This calculator computes invoice totals by applying your chosen VAT rate to the net subtotal, then adding any additional line items or deducting discounts. The standard UK VAT rate is 20%, with a reduced rate of 5% applying to certain domestic and energy-related supplies. Enter your net (VAT-exclusive) amount and the applicable rate; the tool outputs the VAT amount and gross total separately.
Discounts are applied to the net figure before VAT is calculated, in line with HMRC rules for prompt payment discounts. The calculator does not store or transmit any data and is intended for quick estimation. For formal invoicing, always use compliant accounting software that produces records meeting Making Tax Digital requirements. Consult HMRC guidance or an accountant if you are unsure which VAT rate applies to your supply.
Common mistakes
- !Using an assumption that is not supported by a current local quote, bill, statement or official source.
- !Treating a generic estimate as a lender, provider, payroll or tax authority decision.
- !Mixing monthly and annual inputs without converting them consistently.
- !Forgetting location-specific taxes, fees, eligibility rules or payroll deductions where they apply.
- !Testing only one scenario instead of checking how a cautious assumption changes the result.
What to do next
- Run a second scenario with a cautious assumption so you can see the downside clearly.
- Compare the result with the related calculators below before making a decision.
- Check current local rules, eligibility and provider terms before applying or committing money.
- Keep a record of the assumptions so you can update the estimate when a quote, bill or pay figure changes.
- Use the result to prepare better questions for a lender, provider, adviser or employer rather than treating it as a final answer.
Frequently asked
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