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, tax, markup or overheads.
- When you need a practical estimate before committing to a budget or proposal.
- When you are modelling break-even volume as costs or prices change.
A worked example
These are the example figures the calculator opens with.
| Input | Value |
|---|---|
| Subtotal (R) | R1 000 |
| VAT / Sales Tax Rate (%) | 20% |
| Discount (%) | 0% |
For those figures the calculator returns:
- Discount: R0.00
- Net: R1 000,00
- Tax: R200.00
- Total: R1 200,00
How to read your results
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.
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.
- 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.
Questions people ask
Prompt payment discounts offered at the time of invoice should show the net VAT-inclusive amount and the discounted amount clearly. Since 1 April 2015 VAT is charged on the amount actually paid, so if the discount is taken, a credit note or adjustment invoice may be required to reduce the VAT.