COSTING & COMMERCIAL DECISIONS
Will a price cut earn its keep?
A discount can increase revenue while reducing profit. Check the extra volume, the capacity it consumes and the cash it needs before approving it.
THE SHORT ANSWER
Calculate contribution per unit as net selling price less variable cost. A lower contribution means more units are needed to cover the same fixed costs. Then test demand, capacity, product mix and working capital.
FREE DECISION TOOL
Test your pricing assumptions.
Compare a proposed price with your current price. See the whole-unit sales target, break-even point and capacity gap. The starting values are the fictional example in this guide.
Use one currency and one period throughout. Enter numbers without thousands separators, using up to three decimal places. Amounts shown are in your chosen currency units; capacity is in whole units.
If the calculator is unavailable, the worked example and printable worksheet below can be used manually.
- Proposed contribution / unit
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- Proposed break-even units
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- Proposed target-profit units
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- Units for the same target at the current price
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- Change in required whole-unit volume
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- Proposed contribution margin
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- Operating profit if all stated capacity is sold
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Calculation method and limits
Contribution = price − variable cost. Break-even units = fixed costs ÷ contribution. Target units = (fixed costs + target operating profit) ÷ contribution. Unit targets round up; money inputs use exact arithmetic to three decimal places. Percentage changes compare the rounded whole-unit targets.
Assumes one product, unchanged unit variable cost, constant fixed costs within the relevant range, and all units produced are sold. Capacity is a ceiling, not a forecast of demand. Excludes financing, tax, changing sales mix and step costs. A result does not establish available cash or justify a price change by itself.
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Define the decision and the cost behaviour
Write down the product, customer group, period and proposed offer. Start with net price after discounts, returns and channel fees. Keep recoverable taxes out of the comparison and handle irrecoverable amounts consistently with the business’s accounting policy.
Distinguish costs that change with the extra order from costs that remain over the relevant range. Freight, commissions, packaging, rejection and overtime can change the answer. An allocated overhead is not automatically avoidable, and an apparently fixed cost can step up when another shift or machine is needed.
A discount that changes the target
Assume a fictional single-product business, with unchanged variable cost and monthly fixed costs of OMR 30,000. At 2,000 units and a price of OMR 50, contribution is OMR 40,000 and operating profit is OMR 10,000.
Cutting price by 10% to OMR 45 reduces unit contribution by 25%, from OMR 20 to OMR 15. Keeping the same OMR 10,000 operating profit now requires (30,000 + 10,000) ÷ 15 = 2,666.67 units: round up to 2,667 whole units, or 33.35% more volume. Selling the same 2,000 units leaves zero operating profit.
| Measure | Before → after discount |
|---|---|
| Net price per unit | 50 → 45 |
| Variable cost per unit | 30 → 30 |
| Contribution per unit | 20 → 15 |
| Monthly fixed costs | 30,000 → 30,000 |
| Break-even units | 1,500 → 2,000 |
| Units for OMR 10,000 operating profit | 2,000 → 2,667 |
Break-even units = fixed costs ÷ unit contribution. Target units = (fixed costs + target operating profit) ÷ unit contribution. Whole units rounded up; example excludes financing and tax.
Test the constraint, not just the spreadsheet
If the factory can produce only 2,400 units in the period, the discounted target cannot be reached within existing capacity. Identify the actual bottleneck: machine time, skilled labour, working capital, delivery slots or demand. Compare contribution per unit of the constrained resource when alternatives compete for that resource.
Do not spread an incremental decision across arbitrary full-cost allocations. Equally, do not turn a positive short-term contribution into a permanent price policy without considering replacement costs, brand position, support obligations and the revenue displaced from other customers.
Where customers pay later than suppliers, extra sales can require more cash before they deliver more cash. Link the volume assumption to inventory purchases and realistic collection dates.
Write a decision rule before launching the offer
- Document the baseline and proposed net price, unit variable costs, fixed costs and available capacity.
- Calculate contribution, break-even volume and volume needed to preserve the target profit. Round whole-unit requirements up.
- Test plausible volume and cost changes. If contribution is zero or negative, the usual break-even formula does not produce a feasible positive-volume answer.
- Record who approves the offer, its end date and which customers qualify.
- Review realised price, returns, volume, cash collections and contribution after launch. Stop or adjust when the agreed conditions fail.
This simple model assumes constant unit price, variable cost and fixed costs within a relevant range, with production equal to sales. Multiple products, capacity changes and uncertain demand require a richer model.
TAKE THE NEXT STEP
Use the worksheet.
Open the worksheet, type your notes in the fields and use your browser’s Print command to keep a PDF or paper copy. Calculations are manual. Entries stay in your browser and are not submitted to Mizwala; reload or close without saving and they may be lost.
Questions worth checking
Is contribution the same as gross profit?
Not necessarily. Contribution deducts variable costs. Gross profit follows the cost-of-sales accounting basis, which can include allocated fixed production costs. Check definitions before comparing reports.
Can I use this for a service business?
Yes, if you define a meaningful saleable unit and cost behaviour, such as a billable hour or standard engagement. Capacity, scope variation and utilisation may matter more than product volume.
Sources & scope
Primary references checked on 4 November 2026. The calculations, examples and workflow suggestions are Mizwala’s educational illustrations; the linked organisations do not endorse this guide.
This is general management information. Adapt it to your circumstances and obtain appropriate professional advice before relying on it for a material decision.