Pricing and break-even: what each sale must contribute

A selling price has two jobs. It must recover the costs that arise because of the sale, and it must leave enough contribution to pay the costs that continue even when no sale occurs. Profit begins only after total contribution covers those fixed costs.

This is why a product can carry a healthy-looking markup and still lose money. Markup is measured against cost. Margin is measured against selling price. Neither answers how many units the business must sell unless the costs are separated by behaviour.

Find contribution before discussing profit

Contribution per unit is selling price less variable cost per unit. Variable costs change with the activity being measured: material consumed, sales commission, transaction charge, packing or outward freight may belong here if each additional sale causes that cost.

Fixed costs are expected to continue within the relevant operating range even if volume changes: premises rent, core salaries, software subscriptions and a fixed monthly equipment charge are common examples. “Fixed” does not mean permanent. Rent may step up when a second location opens, and staffing may change once capacity is reached.

ICAI cost-accounting material uses the same relationship: contribution equals fixed cost plus profit, the contribution-to-sales ratio is contribution divided by sales, and break-even sales equal fixed cost divided by that ratio. ICAI Board of Studies, July 2025 mock-test solution.

A hypothetical product calculation

Assume a business sells one product at ₹1,000 per unit, excluding GST. Its variable cost is ₹600 per unit, measured net of recoverable GST. Monthly fixed costs are ₹4,80,000. There are no sales returns, capacity constraints or changes in product mix in this simplified case.

At 1,200 units, sales are ₹12 lakh and variable cost is ₹7.20 lakh. The remaining ₹4.80 lakh covers fixed costs, leaving neither profit nor loss.

If the owner wants ₹2 lakh of monthly operating profit before interest and tax, the required contribution becomes ₹6.80 lakh. At ₹400 per unit, the target volume is 1,700 units. That calculation says nothing about whether the market or production team can deliver 1,700 units; it makes the commercial assumption visible.

Margin and markup are different percentages

With a variable cost of ₹600 and a selling price of ₹1,000, the contribution is ₹400. The contribution margin is 40% of sales. The markup on variable cost is 66.67% because ₹400 is two-thirds of ₹600.

Both percentages describe the same unit, but they use different bases. Quoting a 40% markup when the model assumes a 40% margin would produce a price of ₹840 rather than ₹1,000. At ₹840, contribution falls to ₹240 and the break-even volume rises from 1,200 to 2,000 units.

State the denominator on every pricing sheet. “Gross margin”, “contribution margin” and “markup” should not be used as interchangeable labels.

A discount needs more volume than it first appears

Suppose the business offers a 10% price discount. The price falls from ₹1,000 to ₹900, while variable cost remains ₹600. Contribution falls from ₹400 to ₹300, a 25% reduction in contribution per unit.

The break-even volume becomes ₹4,80,000 divided by ₹300, or 1,600 units. That is 400 units more than the original break-even point.

The volume needed to preserve an existing contribution can be sharper. At the original price, 1,500 units produce ₹6 lakh of contribution. At the discounted price, the business must sell 2,000 units to produce the same ₹6 lakh. The 10% discount therefore requires 33.33% more volume in this example, assuming the extra units do not change variable cost or fixed capacity.

The extra volume may also create costs omitted from the first model: overtime, additional delivery trips, higher returns, longer customer credit or a second machine shift. Add those effects before approving the offer.

Use the cost that the decision changes

One pricing sheet cannot answer every decision. A short-run order using idle capacity may be assessed against incremental cost, subject to tax, contract, brand and capacity considerations. A recurring price must also support the fixed resources required to serve that customer over time.

Allocate common overhead carefully. An allocation can help test whether the whole business is sustainable, but an arbitrary share of head-office cost does not become a cash saving when one order is rejected. Keep contribution analysis and full-cost profitability side by side rather than forcing one measure to do both jobs.

For a multi-product business, mix matters. A break-even model based on the average contribution assumes a particular sales mix. If customers shift toward the lower-contribution product, the actual break-even sales value rises even when total units hold.

Build a pricing decision sheet

For each material product, service or customer segment, record the price excluding indirect tax, the unit or activity driver, variable cost, contribution, capacity required, expected volume and payment timing. Then show monthly fixed costs and any step cost triggered by higher volume.

Test at least the base price, proposed discount and a weaker-volume case. Record which inputs are observed and which are assumptions. Revisit the calculation when purchase rates, wages, commission terms, wastage or product mix change.

Break-even is a threshold, not a safe target. A business selling exactly at break-even has no room for returns, bad debts, downtime or forecast error. Use the calculation to expose what each sale contributes and how much volume the price demands, then judge whether the market and operating capacity can support it.