How to calculate a break-even point for a small business in Australia

Every small business owner eventually asks the same question, just phrased differently each time: how much do I actually need to sell before I stop losing money? A break-even analysis answers that directly, and unlike most financial modelling, it doesn't require forecasting growth rates or guessing at market conditions. It only needs two things you already have on hand: your costs and your prices.

It's worth doing properly rather than eyeballing it, because break-even sits underneath almost every other decision a small business makes. It tells you whether a discount is survivable, whether a new hire or a bigger lease is affordable before the extra revenue actually lands, and whether a slow month is a normal dip or a sign the underlying model no longer works. Owners who know their break-even number cold tend to make calmer decisions under pressure, because they're working from a fixed reference point rather than a feeling.

How do you calculate your break-even point?

A break-even calculation rests on three inputs, and the discipline is in classifying costs correctly, not in the arithmetic itself.

• Fixed costs — costs that don't change with sales volume in the short term: rent, insurance, base wages, software subscriptions, loan repayments.
• Variable cost per unit — the cost that scales directly with each sale: cost of goods, packaging, payment processing fees, sales commission.
• Selling price per unit — what the customer actually pays after typical discounting, not your list price.

Subtract variable cost from selling price and you get your contribution margin per unit — what each sale actually contributes toward covering fixed costs, before it starts contributing to profit. Divide total fixed costs by that contribution margin, and the result is your break-even point in units:

Break-even (units) = Fixed costs ÷ (Selling price − Variable cost per unit)

Multiply that unit figure back out by your selling price and you have your break-even point in revenue, which is usually the number owners actually think in day to day.

As a worked example: a business with $8,000 a month in fixed costs, selling a product at $40 with a variable cost of $24, has a contribution margin of $16. Divide $8,000 by $16 and the break-even point is 500 units a month, or $20,000 in revenue. Every sale beyond the 500th in that month is where profit actually starts.

One practical note for Australian businesses: run this calculation on GST-exclusive figures throughout. GST collected on a sale is not revenue you keep, and GST paid on a purchase is not a real cost to the business once it's claimed back — including it on either side of the equation will distort both your contribution margin and your break-even point without changing anything real about the underlying economics.

Should you break even in units or in dollars?

Both answer a genuine question, but they suit different businesses.

Approach	What it answers	Best used for
Break-even in units	How many individual sales do we need this period?	A single product or service sold at one price
Break-even in revenue	How much total revenue do we need this period?	Multiple products, variable pricing, or service billing

For a business selling one product at one price, units are the clearer target because they name the volume directly — sell 1,500 units and you've covered your costs. For a business with a mixed catalogue or a service billed by the hour or project, a single units figure stops meaning anything, because products carry different prices and margins. Use your contribution margin ratio instead — contribution margin divided by selling price, expressed as a percentage:

Break-even (revenue) = Fixed costs ÷ Contribution margin ratio

How does a price change affect your break-even point?

This is where break-even earns its keep as a pricing tool, not just an accounting exercise. A small price increase can meaningfully lower the volume you need to sell, because it flows straight through to contribution margin. Take a business with $60,000 in fixed costs and a $30 variable cost per unit:

Selling price	Contribution margin	Break-even units
$50	$20	3,000 units
$60	$30	2,000 units
$70	$40	1,500 units

A 20 percent price increase, from $50 to $60 in this illustration, cuts the required volume by a third. That's the calculation worth running before any discount decision too: a discount doesn't just reduce your margin on the units you were already going to sell, it raises the volume you need on every unit to cover the same fixed costs. Most owners underestimate how much extra volume a price cut actually requires until they see it laid out this way.

What about a business with multiple products or services?

A single break-even figure breaks down once your offer includes items with different margins. The standard fix is a weighted average contribution margin ratio, built from your actual sales mix rather than an even split across products. If a third of your revenue comes from a high-margin line and two-thirds from a low-margin one, your weighted average sits closer to the low-margin figure, and so does your break-even revenue. This is also why break-even isn't a number you set once and file away — a shift in your sales mix toward lower-margin lines raises your break-even point even if total revenue holds steady, which is exactly the kind of change that shows up in the monthly numbers worth tracking as part of a wider set of business metrics, not just in a break-even model reviewed once a year.

What mistakes commonly wreck a break-even analysis?

The formula is simple enough that the errors are almost always in the inputs, not the maths.

Misclassifying a cost. Discretionary costs that scale loosely with sales, like a commission-based marketing spend, get treated as fixed when they should flex, and true fixed costs occasionally get treated as variable because they're paid irregularly. Review each cost line against the actual definition, not habit.

Leaving the owner's own wage out. If you're not currently drawing a market-rate salary, it's tempting to exclude it from fixed costs to make the number look healthier. That produces a break-even point that reflects what keeps the business from an overdraft, not what it needs to sustainably support the person running it.

Letting fixed costs drift unnoticed. Software renewals, a rent step-up, an insurance premium increase — each one is small individually, but together they can move your break-even point meaningfully without anyone deciding to recalculate it.

Treating margin as static across all volume. Bulk supplier discounts, tiered payment processing fees, and shipping cost bands mean your variable cost per unit can genuinely change at different volumes. A break-even model built at your current scale can understate the margin available once you clear a supplier discount threshold, or overstate it if a shipping tier resets against you.

When should you recalculate your break-even point?

Recalculate it any time a major input changes: a price change, a new fixed cost such as a lease or a hire, a supplier cost increase, or a meaningful shift in your product or service mix. Outside of those triggers, reviewing it quarterly alongside your other core numbers keeps it accurate without turning it into unnecessary admin. Once you know your break-even revenue, pairing it with a cash flow forecast answers the next question that naturally follows: not just whether you'll eventually cover your costs, but whether you have enough cash in the bank to survive the weeks between now and getting there.

It's also worth tracking how far above break-even you're actually trading, not just whether you've cleared it. The gap between your current revenue and your break-even revenue is your margin of safety, and a business running only a few percent above break-even in a normal month has very little room to absorb a late-paying customer, a quiet fortnight, or an unplanned cost. Widening that margin, either by lifting revenue or by trimming fixed costs, is usually a more useful goal than the break-even point itself once you've cleared it comfortably.

A break-even number on its own is a useful fact. Used properly, it's a filter you run every pricing decision, every hire, and every lease through before you sign it, rather than after. If you'd like a break-even and pricing model built specifically around your actual cost structure, that's exactly the kind of hands-on work our advisory services are built for — book a free consultation and we'll build one with you.