26 June 2026
The Five Financial Ratios Your Business Cannot Afford to Delegate
Most small business owners track their bank balance and wait for the accountant. These five ratios tell you whether your business is actually working.
Check the balance, close the app. That's the rhythm for most business owners. It answers the most pressing question (is there money?) and takes ten seconds. Everything else gets routed to the accountant.
The problem is that neither habit is financial management. The bank balance tells you what has already happened. The accountant's reports tell you what happened in a period that's already closed. Neither tells you whether your business will still be operational in six weeks.
There are five ratios that answer that question. None requires an accounting qualification to calculate. All five can sit on one page. Looking at that page weekly is, in practical terms, what financial management actually means in a small business.
The distinction between owner and accountant matters here. The accountant is the right person for tax compliance, annual financial statements, and structuring decisions. That work is genuinely specialist. But the question of whether the business is working right now -- at the level of day-to-day operations -- belongs to the owner, and it cannot be outsourced.
Why the bank balance misleads
Two businesses can both show R150,000 in the bank and look identical from the outside.
In the first, the business is profitable, cash flow is positive, and the balance represents genuine surplus. In the second, the business is losing R25,000 a month, the balance is a large creditor payment that arrived earlier in the month, and within six weeks the account will be empty. You cannot tell these apart from the balance.
A different version of the same problem: the business is profitable on paper -- strong revenue, solid margins -- but R320,000 in invoices are sitting unpaid past 60 days. The bank balance is R40,000. Fixed costs run to R85,000 a month. The business has less than three weeks before it cannot pay salaries, despite being profitable by every measure an accountant would use.
This is not a hypothetical. Research shows that 91% of South African SMEs experience late payments, with many invoices unpaid past 30 days. In the private sector, the end-to-end cash cycle for an SME supplying a large corporate can stretch to 150 days once order times, delivery, and extended payment terms are factored in. In that environment, a healthy-looking bank balance is one of the least reliable signals available.
The ratios below tell the difference.
1. Gross Margin
What it measures: Whether the core business model works at unit level, before overhead comes into the picture.
Formula: (Revenue minus Cost of Sales) / Revenue x 100
Cost of Sales is the direct cost of delivering what you sell: materials, direct labour, contractor fees, production costs. It excludes rent, management salaries, marketing, and admin costs.
A Durban consulting firm billing R200,000 a month with R40,000 in direct costs has a gross margin of 80%. A Cape Town manufacturer selling R600,000 in product with R390,000 in materials and production labour has a gross margin of 35%.
What it tells you: If gross margin is insufficient, revenue growth makes things worse, not better. A business scaling on a 10% gross margin generates R0.10 for every rand of revenue to cover rent, salaries, loan repayments, and everything else. The overhead has nowhere to go.
Gross margin is also the first place to look when a business feels stretched despite reasonable revenue. If it's declining over time, either prices are softening, direct costs are rising, or the mix of work is shifting toward lower-margin jobs. Any of these is manageable at one or two percentage points. At ten points, it's a structural problem.
Where the inputs come from: Revenue from your invoicing or accounting software. Cost of sales from supplier invoices and production payroll records.
2. Debtor Days
What it measures: How many days your customers take to actually pay after you've invoiced them.
Formula: (Debtors balance / Monthly revenue) x 30
If you have R240,000 in outstanding invoices and monthly revenue is R120,000, debtor days are 60. Customers are taking two months to pay on average.
What it tells you: Every day a customer takes to pay is a day you're funding their operations with your cash. At 30 days, this is normal and manageable. At 60-90 days, you have a working capital problem regardless of what the income statement shows.
This matters more in South Africa than in most markets. Government departments are legally required to pay suppliers within 30 days under the Public Finance Management Act. As of mid-2025, R12.4 billion in invoices older than 30 days remained unpaid by government departments alone -- a 17% increase on the previous quarter. Many businesses dealing with large private sector corporates face terms of 60-90 days as standard, with the full collection cycle sometimes exceeding that.
The implication is straightforward: debtor days should be a number you know every month, not something that becomes visible only when a cash crisis arrives.
Where the inputs come from: The debtors balance (accounts receivable) from your accounting software. Monthly revenue from your invoicing records.
What to watch: Debtor days creeping upward is a warning signal that precedes cash problems by weeks or months. If your terms are 30 days and your debtor days are 55, find out which clients are driving the gap and address it directly. A polite conversation about payment terms is considerably less painful than a cash flow crisis.
3. Cash Runway
What it measures: How many months the business can operate at current spending levels with its current cash.
Formula: Cash on hand / Monthly fixed costs
Fixed costs are the costs that continue regardless of revenue: rent, salaries, loan repayments, software subscriptions, insurance. If you have R210,000 in cash and fixed costs of R70,000 a month, you have three months of runway.
What it tells you: This is the survival metric. Runway tells you how much time you have to fix something if revenue drops, a major client delays payment, or an unexpected cost hits. A business with one month of runway has almost no room to act deliberately. Everything becomes reactive. A business with four or five months can absorb disruption and make considered decisions.
Where the inputs come from: Cash on hand from your bank account. Monthly fixed costs from your accounting software or a simple cost schedule maintained separately.
What to watch: Below two months is a warning position. It doesn't mean the business is failing, but it means a single bad month becomes a crisis with no buffer. Building runway to three to four months during strong months should be a deliberate priority, not something that happens by accident.
4. Break-Even Revenue
What it measures: The minimum monthly revenue the business needs to cover all costs and reach zero profit.
Formula: Fixed Costs / Gross Margin %
If fixed costs are R90,000 a month and gross margin is 60%, the break-even point is R150,000. Below that, the business loses money every month. Above that, profit begins.
What it tells you: Break-even is the floor. It's the first number to check against actual revenue at month end -- not whether you made money, but whether you cleared the minimum threshold to break even before profit starts.
It also turns every fixed cost decision into a financial calculation. Hiring an additional person at R25,000 a month raises break-even by R25,000 / 0.60 = R41,667 in additional revenue required before the business is back to breaking even. If that revenue isn't expected, the hire is a negative financial decision by definition. This kind of calculation takes thirty seconds and happens too rarely in early-stage businesses.
Where the inputs come from: Fixed costs from your accounting software. Gross margin % calculated as above.
5. Net Margin
What it measures: What percentage of revenue remains as profit after all costs -- overheads, tax, and interest included.
Formula: Net Profit / Revenue x 100
If the business generates R300,000 in monthly revenue and net profit after all expenses and taxes is R27,000, net margin is 9%.
What it tells you: Gross margin tells you if the business model works. Net margin tells you if the whole operation works -- once rent, management salaries, marketing, loan repayments and admin costs are accounted for. A business with 65% gross margin and 4% net margin has a product or service that works but a cost structure that's consuming most of what it generates.
Where the inputs come from: Net profit from monthly management accounts. Revenue from invoicing records. If you're not receiving monthly management accounts from your accountant, that's the first conversation to have.
What to watch: Net margin below 5% in an established business warrants a cost review. The question is whether the overhead is generating the revenue that justifies it, or whether the cost structure has grown ahead of the income that supports it.
Reference benchmarks
Margins vary significantly by business type. These figures are directional -- use them to understand whether you're in the right range for your sector, not as definitive targets.
| Business type | Gross margin range | Net margin target |
|---|---|---|
| Consulting / professional services | 65-80% | 15-25% |
| Agency / creative services | 40-60% | 10-20% |
| Retail (non-food) | 30-45% | 4-9% |
| Manufacturing | 25-45% | 6-12% |
| Food and beverage service | 60-70% (beverages), 30-50% (food) | 5-10% |
| E-commerce / physical product | 30-50% | 5-15% |
The number worth paying attention to is trend over time within your own business. A consulting firm at 72% gross margin is healthy. The same firm at 58% and declining has a pricing or cost problem that needs investigation before it reaches 50%.
The one-pager
The point of tracking these five ratios is not to track them once and file them. It's to see them together, on one page, regularly enough to catch movement before it becomes a problem.
The format is irrelevant -- a column in a spreadsheet, a table in a note, a page in a physical ledger. What matters is that the five numbers are in one place and reviewed at the same time, so you see them in relation to each other rather than in isolation.
Weekly or fortnightly works for most early-stage businesses. Monthly is the floor.
The review takes fifteen minutes once the inputs are collected. You're looking for anything moving in the wrong direction: gross margin dropping, debtor days increasing, runway shortening, revenue below break-even for a second consecutive month, net margin compressing without explanation. Any one of these in isolation is worth noting. Two or more moving together is a conversation to have with your accountant -- but this time, you're arriving with the question rather than waiting for a report.
Where to find the inputs
If you use accounting software -- Xero, Sage, QuickBooks -- most of these inputs are available in existing reports. You're not creating new financial infrastructure. You're pulling five numbers from what already exists.
| Ratio | Inputs needed | Where to find them |
|---|---|---|
| Gross margin | Revenue; Cost of Sales | Invoicing records; supplier invoices and direct payroll |
| Debtor days | Accounts receivable balance; Monthly revenue | Accounting software; invoicing records |
| Cash runway | Cash on hand; Monthly fixed costs | Bank statement; accounting software or cost schedule |
| Break-even revenue | Monthly fixed costs; Gross margin % | Accounting software; calculated from gross margin above |
| Net margin | Net profit; Revenue | Monthly management accounts; invoicing records |
If you are not receiving monthly management accounts, request them. The cost of producing them is modest. The cost of operating without them is higher.
What changes when you do this
Most financial crises in small businesses are not sudden. They're the result of a gross margin that declined over six months, a debtor book that quietly stretched to 90 days, a cost base that grew faster than the revenue supporting it. All of these are visible in the ratios before they're visible in the bank balance.
The business owner who looks at five numbers on one page every week sees a deteriorating trend when it's still a trend, not when it's already a crisis. That lead time is the entire point.
The accountant is still the right person for the technical work. But the five ratios above are not technical. They are operational information that the owner is best positioned to act on, because the owner is the one making pricing decisions, hiring decisions, and client decisions every week. The numbers inform those decisions or they don't. There's no middle position.