Small-business guide
Discount Pricing Guide
A discount changes revenue, margin and required sales volume; it should be modelled against variable costs and expected conversion lift.
Updated 16 October 2026 • Reviewed by Tools by Layna Editorial Team • General information only
The straight answer
A discount changes revenue, margin and required sales volume; it should be modelled against variable costs and expected conversion lift.
What matters most
| Priority | How to apply it |
|---|---|
| Main driver | A 20% discount requires more than 20% extra units to preserve gross profit. |
| Downside risk | Apply discount to the correct GST basis. |
| Verification point | Permanent promotions can train customers to wait. |
How to use this guide
Compare the normal selling price, discount, variable cost, payment cost, return allowance and GST treatment on the same sale. For this page, the comparison is only valid when the monetary basis and timing are consistent.
- For discount pricing guide, name the decision first so the model does not drift into a different question.
- Validate the base case against this page-specific point: A 20% discount requires more than 20% extra units to preserve gross profit.
- Build a realistic downside scenario around this constraint: Apply discount to the correct GST basis.
- Before acting, verify this final check against current statements, contracts or official guidance: Permanent promotions can train customers to wait.
Worked example
If an item sells for $100 with $60 variable cost, contribution is $40; at $80 sale price contribution is $20, so unit volume must double to preserve contribution.
What can change the answer
- For discount pricing guide, confirm whether every amount is gross or net and whether GST is included, excluded or not applicable.
- Separate fixed costs, variable costs, one-off costs, interest and fees instead of hiding them inside one total.
- Use actual payment dates and matching weekly, monthly or annual periods so timing does not distort the comparison.
- Stress-test the result against the risk highlighted on this page: Apply discount to the correct GST basis.
Common mistakes
- Changing a plan from a single discount pricing guide result before a repeatable baseline exists.
- Ignoring the page’s main limitation: Apply discount to the correct GST basis.
- Changing course before checking this review signal: Permanent promotions can train customers to wait.
- Choosing the most attractive headline figure while ignoring cash flow, fees, timing or the cost of being wrong.
Sources and method notes
- business.gov.au: choosing a pricing strategy — Allowing for costs and discounts when setting a selling price.
- Business Victoria: break-even, margin and markup — How contribution connects sales volume with covering overhead.
Related calculators and guides
Frequently asked questions
Why can a 20% discount require twice as many sales?
If price falls from $100 to $80 while variable cost stays $60, contribution falls from $40 to $20. You need twice as many units to keep the same total contribution, before any extra costs.
Should I test a discount against revenue or contribution?
Test contribution after variable costs. Higher revenue can still leave less money for overhead if the discount reduces the amount retained from each sale.
Bottom line
A discount changes revenue, margin and required sales volume; it should be modelled against variable costs and expected conversion lift. Use discount pricing guide to compare scenarios and expose the assumption doing the most work. Verify current rates, fees, GST treatment and contract terms before committing.