Most owners know their monthly revenue, their gross margin and their main costs. Far fewer can state the single number that combines them: the revenue that must come in this month before the business has covered the cost of simply existing. Below that figure, the business loses money by design rather than by bad luck. The arithmetic is simple, yet many businesses never do it, because the two inputs are watched separately.
A second breakeven number appears whenever a business decides whether to rent, lease or buy something: a vehicle, a machine, software, storage space. There is a level of use at which the options cost the same. Below it, renting is cheaper; above it, owning or leasing usually wins. Calculating that crossover is easy. The harder part is judging which side of it the business will really be on.
This article explains how to calculate and use both numbers, why the monthly revenue floor moves faster than the cost base, why the cash floor differs from the profit floor, and how to make rent-or-buy decisions that hold up when usage turns out differently from the plan. It is general information; talk to your accountant about your own figures, and get advice if the business is under financial pressure.
The monthly revenue floor
Two definitions carry the idea:
- Contribution margin is what remains from each dollar of revenue after the costs that rise and fall with sales, such as materials, direct labour, freight and commissions. It is usually expressed as a percentage.
- Fixed costs are what the business pays each month whether or not it sells anything: rent, salaried staff, insurance, leases, software, loan repayments and the owner’s drawings if the business depends on them.
Dividing the fixed costs by the contribution margin gives the monthly revenue floor:
Revenue floor = monthly fixed costs ÷ contribution margin
A business with $60,000 of monthly fixed costs and a 40% contribution margin needs $150,000 of revenue each month just to break even. At that margin, every dollar of fixed cost needs $2.50 of revenue behind it.
The floor is a decision boundary, not just a report. Almost every commercial decision moves it.
Why the floor moves faster than costs
Using the same business, consider two common decisions.
A new commitment. The business signs a lease and hires an extra salaried person, adding $9,000 a month in fixed costs. The floor rises to $172,500. The business has committed $9,000 a month but must now find $22,500 more revenue every month just to stand still.
A standing discount. Instead, the business holds costs steady but introduces a discount programme that lowers its contribution margin from 40% to 32%. The floor rises to $187,500, an extra $37,500 of revenue needed every month, from a decision that may never have been treated as a cost.
| Scenario | Monthly fixed costs | Contribution margin | Monthly revenue floor |
|---|---|---|---|
| Current position | $60,000 | 40% | $150,000 |
| Standing discount | $60,000 | 32% | $187,500 |
| New lease and hire | $69,000 | 40% | $172,500 |
| Both decisions | $69,000 | 32% | $215,625 |
The lesson is uncomfortable: pricing authority is spending authority, and often the more consequential kind. A standing discount permanently raises what the business must earn to survive, yet it is often approved by fewer people, against a lower threshold, than a modest equipment purchase. The discounting without destroying your margin article covers how much extra volume a discount needs.
Common misreadings
- Breakeven is a start-up calculation. It is often worked out once for a business plan and then forgotten. The floor moves whenever costs or margins move, which is constantly.
- Margin is a scorecard. Used properly, it is the number that decides how much revenue every fixed cost demands.
- A stable cost base means a stable floor. The floor is more sensitive to margin than to costs.
- Clearing the floor over a year is enough. A business can clear its annual breakeven while losing money in several individual months, and those months consume cash.
Make the floor a governance number
Because so many decisions move the floor, it helps to:
- Report the floor monthly beside actual revenue, with a note on what moved it.
- Require every significant proposal to state its effect on the floor in dollars, whether it is a new hire, a lease, a standing discount or a service commitment that adds cost without adding price.
- Recalculate it quarterly from actual results rather than the budget.
- Calculate margin by product, customer or job type. An average margin hides work that earns below average and therefore raises the floor it is supposed to help cover.
- Count the months below the floor over the past year. The number is rarely zero and is often surprising.
The cash floor is a different number
Clearing the profit floor does not guarantee the business can pay its bills. The cash floor depends on timing. If suppliers must be paid in 30 days and customers pay in 60 or 90, the business funds the gap on every sale. Growth widens it, because each extra sale commits costs before the cash arrives. The order book grows, profit looks healthy and the bank balance falls.
This is why a lender may hesitate over a business with a full order book. On stretched payment terms, more orders mean more money tied up before customers pay.
The fix is mostly commercial: deposits, progress billing, shorter customer terms and supplier terms matched to when customers pay. Chasing overdue invoices helps, but it treats the symptom. The why the cash flow statement keeps a business honest article explains how to read cash movements.
Company directors in Australia also have duties not to incur debts when a company is insolvent or would become insolvent by incurring them. If the business is regularly falling below its cash floor, talk to your accountant early and take advice on your obligations.
The rent-or-buy crossover
The second breakeven number applies to equipment, vehicles, space and software. Options usually differ in how their costs are structured:
- Renting or hiring has little fixed commitment but a higher cost each time it is used.
- Leasing or buying has fixed costs, such as payments, maintenance, insurance and storage, but a lower cost per use.
Suppose hiring a machine costs $100 a day. Leasing one costs $3,000 a year in fixed charges such as maintenance, plus $70 a day to operate. The two options cost the same when $100 × days = $3,000 + $70 × days, which is at 100 days of use a year. Below 100 days, hiring is cheaper; above it, leasing is.
| Days used per year | Hire cost | Lease cost |
|---|---|---|
| 60 | $6,000 | $7,200 |
| 80 | $8,000 | $8,600 |
| 100 | $10,000 | $10,000 |
| 120 | $12,000 | $11,400 |
| 160 | $16,000 | $14,200 |
The crossover is not the decision
The calculation is the easy part. The decision depends on several things the arithmetic leaves out:
- Usage is a range, not a number. If the business expects 120 days but delays could cut that to 80, the cheaper-looking lease becomes the more expensive option. Test low, expected and high scenarios.
- Omitted costs. Finance, storage, insurance, transport to and from site, administration and downtime can all shift the crossover.
- Availability. Hiring is only cheaper if the equipment can be hired when needed. In a busy season, scarcity may matter more than price.
- Obsolescence. Committing long term to equipment whose technology is changing quickly carries risk the daily rate does not show.
- Reversibility. Hiring keeps options open. Leasing or buying commits the business to a level of capacity and a particular technology.
- Capital. Money tied up in non-essential equipment cannot be used elsewhere. Paying a higher hire rate can be sensible if it keeps capital for the assets that matter most.
When repeated hiring signals a capability need
Breakeven analysis can reveal something larger. If the business keeps hiring the same equipment well above the crossover, the need is probably no longer temporary. It may have become a regular capability the business should own. Conversely, owning equipment that sits idle most of the year may hide capital trapped in capacity the business no longer needs.
Review high-value hired and leased items once a year: actual usage compared with the forecast, current rates and whether the original reasoning still holds. Yesterday’s crossover can quietly become tomorrow’s hidden cost.
A worked example
This is an illustration. A landscaping and civil works business has monthly fixed costs of $60,000 and a contribution margin of 40%, giving a revenue floor of $150,000. The owner is considering two decisions at once: a 10% standing discount for its three largest builder customers, which would lower the overall contribution margin to about 36%, and leasing a compact excavator instead of hiring one.
The discount first. At 36%, the floor would be about $166,700, an extra $16,700 of revenue every month. The owner asks whether the builders would genuinely move their work elsewhere without the discount, and whether the discount would bring enough extra volume. The answer is uncertain, so the owner offers a smaller volume-based rebate instead, paid only if annual spend exceeds an agreed level, which protects margin on existing work.
Then the excavator. The business has hired one for about 110 days a year over the past two years, at $100 a day. A lease would cost $3,000 a year in fixed charges plus $70 a day to run. The crossover is 100 days. At 110 days, leasing would save about $300 a year, too small to matter given the commitment. But the owner checks the trend: hire days have risen each year and two new contracts would add about 50 days. At 160 days, leasing saves about $1,800 a year and guarantees availability in the busy season, when hire machines are scarce. The owner leases, adds the new fixed cost to the revenue floor calculation, and records the usage to review after twelve months.
How this applies to a small Australian business
Small businesses often make pricing and equipment decisions separately, by different people, without seeing the combined effect. Practical steps:
- Calculate your monthly revenue floor from actual results.
- Report it monthly beside revenue.
- State the floor effect of every significant hire, lease or standing discount.
- Treat pricing decisions as seriously as spending decisions.
- Calculate a cash floor that reflects when customers pay and when you pay suppliers.
- Work out the crossover for significant rent-or-buy decisions, then test it against a range of usage.
- Review hired and leased items annually.
- Talk to your accountant about your figures, financing options and tax effects, and take advice early if cash is tight.
Signals worth watching
- Revenue growing while the bank balance falls.
- Months below the floor that nobody discusses.
- Standing discounts approved without considering their effect on the floor.
- New fixed costs added to relieve short-term pressure.
- Equipment hired repeatedly above the crossover.
- Owned equipment sitting idle most of the year.
Common mistakes
- Never calculating the floor, or calculating it once and forgetting it.
- Treating discounts as sales decisions rather than cost decisions.
- Confusing profit with cash.
- Treating the crossover as the decision.
- Assuming forecast usage will happen.
- Ignoring availability and reversibility in rent-or-buy decisions.
Frequently asked questions
What should count as a fixed cost? Anything the business must pay in a month regardless of sales: rent, salaries, leases, insurance, subscriptions, loan repayments and, in practice, the owner’s essential drawings.
How do I work out contribution margin? Take revenue, subtract the costs that vary with sales, and divide by revenue. Your accountant can help separate fixed and variable costs if your accounts do not already do so.
What if our costs are partly fixed and partly variable? Many are. Split them as sensibly as you can; the floor does not need to be exact to be useful.
Is leasing always better than hiring above the crossover? No. Availability, flexibility, technology change and how sure you are about usage all matter. The crossover tells you where the economics change, not what to decide.
How often should the floor be updated? Quarterly at least, and whenever a significant pricing or cost decision is proposed.
Should the revenue floor include the owner’s pay? If the business depends on the owner taking a regular amount, yes. Otherwise the floor will look comfortable while the owner is effectively working for nothing.
Questions to ask
- What is our monthly revenue floor, and how many months last year fell below it?
- Which recent decisions raised the floor, and who approved them?
- Do our pricing decisions go through the same scrutiny as our spending decisions?
- What is our cash floor, given when customers actually pay?
- Which hired items are we using well above the crossover?
- Which owned items are idle most of the year?
Bringing it together
Two simple numbers carry a great deal of information. The monthly revenue floor, fixed costs divided by contribution margin, shows how much revenue the business needs just to stand still, and how much every discount and fixed commitment raises that requirement. The rent-or-buy crossover shows where the economics of owning and hiring change. Neither is the decision on its own. Use the floor to govern pricing and commitments together, keep a separate eye on cash, and test rent-or-buy decisions against realistic ranges of use, availability and reversibility.
Source: KEVOS notes, drawing on teaching material on breakeven analysis, contribution margin and rent-versus-lease decisions. Examples and figures in this article are illustrations. This article is general information, not financial or legal advice.
