Accounting Jargon, Simplified

At some point, often sooner than you expect, your business will outgrow doing the books yourself. Payroll gets more complex, tax deadlines start to matter, or you simply want your evenings back.

When that moment comes, you'll get far more out of your first conversation with an accountant if you already understand the shape of your own numbers, rather than handing over a shoebox of receipts and hoping for the best.

You don't need to become an accountant yourself. But knowing these eight terms means you'll be able to ask sharper questions, spot problems earlier, and understand what your accountant is telling you - instead of nodding along. Here they are and some notes on what to bring to that first meeting.

1. Gross Profit Margin

This tells you how much money you keep from each sale before overheads (rent, salaries, insurance, etc.) are taken out.If you sell a product for £100 and it costs you £60 in materials and direct labour to make, your gross profit is £40, and your gross profit margin is 40%.

Why it matters: This is your first checkpoint on profitability. If your margin is thin, even a small rise in supplier costs or a discount to win a customer can wipe out your profit entirely. Compare your margin over time and against others in your industry - a shrinking margin is often the earliest warning sign that something needs attention, well before it shows up in your bank balance.

Ask your accountant: What's a healthy gross margin for my industry, and how should I categorise costs so this number is accurate?

2. Net Profit Margin

While gross profit margin looks only at the direct cost of making your product or delivering your service, net profit margin looks at what's left after everything has been paid - overheads, salaries, rent, interest, tax.

If you sell £100,000 worth of goods a year and, after all costs and tax, you're left with £8,000, your net profit margin is 8%.

Why it matters: This is the real test of whether the business, as a whole, is worth running. A business can have a healthy gross margin but a thin (or negative) net margin if overheads are too high relative to sales. Tracking both side by side tells you whether a profitability problem is coming from what you sell (gross margin) or from how the business is run day to day (net margin).

Ask your accountant: Which of my overheads are essential versus optional, and where does most of the gap between gross and net margin come from?

3. Cash Runway

Cash runway is how many months your business can keep operating before it runs out of cash, assuming no new income comes in.

If you have £30,000 in the bank and you're spending £5,000 more than you bring in each month, your runway is 6 months.

Why it matters: Profit and cash are not the same thing. A business can be "profitable on paper" and still run out of cash - for example, if customers are slow to pay, or you've just bought a lot of stock. Runway forces you to look forward, not just backward, and gives you an early warning to cut costs, chase invoices, or raise finance before it's urgent.

Ask your accountant: Can you help set up a simple cash flow forecast, and what should trigger a conversation about additional funding?

4. Debtor Days

This measures, on average, how many days it takes your customers to pay you after you invoice them.

If customers owe you £20,000 and your annual credit sales are £200,000, your debtor days are 36.5 - meaning it takes just over a month, on average, to get paid.

Why it matters: The longer your debtor days, the more of your own cash is effectively being lent out to customers for free. Rising debtor days is a common early symptom of cash flow trouble, even when sales are growing. Keeping this number down - through clear payment terms, prompt invoicing, and following up on late payers - is one of the highest-leverage things an owner-manager can do.

Ask your accountant: What credit control process or software would suit a business my size, and is it worth charging interest on very late payments?

5. Creditor Days

Creditor days measure the mirror image of debtor days: on average, how many days you take to pay your own suppliers after they invoice you.

If you owe suppliers £10,000 and your annual credit purchases are £120,000, your creditor days are just over 30 - you're taking roughly a month to pay your bills.

Why it matters: Taking longer to pay suppliers keeps cash in your business for longer, which can ease pressure on your runway. But push it too far and you risk damaging supplier relationships, losing early-payment discounts, or being refused credit terms in future. Comparing your creditor days against your debtor days is also revealing: if customers take 60 days to pay you but your suppliers want paying in 30, you have a built-in cash flow gap to plan around.

Ask your accountant: Is there a gap between my debtor and creditor days I should be planning around, and are there better payment terms I could negotiate?

6. Working Capital

Working capital is the money tied up in the everyday running of the business - the difference between what you have readily available and what you owe in the short term.

If your business holds £15,000 in cash and stock and is owed £10,000 by customers, but owes £18,000 to suppliers and short-term lenders, your working capital is £7,000.

Why it matters: Positive working capital means you can comfortably cover what's due in the near term; negative working capital is a warning sign that short-term bills may not be met without new cash coming in. It's a single number that pulls together your debtor days, creditor days, and stock levels into one health check - and it's often what a bank or lender looks at before extending credit.

Ask your accountant: What does my working capital position look like right now, and would a bank or investor see it as healthy?

7. Fixed Costs

Fixed costs are expenses that stay roughly the same regardless of how much you sell - rent, insurance, salaries, software subscriptions. This is in contrast to variable costs, which rise and fall directly with sales volume (materials, packaging, sales commission).

Why it matters: Knowing your fixed costs tells you your break-even point - the minimum sales you need each month just to cover costs before you make any profit. It also tells you how much risk you're carrying: high fixed costs mean a quiet month hits you hard, whereas a cost base that flexes with sales is more resilient, especially in the early, unpredictable years of a business.

Ask your accountant: What's my break-even point right now, and which of my fixed costs could be made variable (e.g. moving from a salaried role to freelance support)?

8. Drawings

Drawings are money (or goods) that an owner takes out of the business for personal use - distinct from a salary, which is a formal, taxed payment processed through payroll.

Why it matters: If you run a sole trader or partnership, drawings are the normal way you pay yourself, but they are not a business expense and don't reduce your taxable profit - you're taxed on the profit the business makes, regardless of how much you actually draw out. This trips up a lot of new owners who withdraw more cash than the business can safely spare, mistaking "money in the bank" for "money that's mine to take." Keeping drawings disciplined and separate from business funds also makes your bookkeeping - and any future lender or investor conversation - far cleaner.

Ask your accountant: Is drawings, salary, or dividends the most tax-efficient way for me to pay myself given my business structure?

You don't need perfect figures before you speak to an accountant - that's exactly what we're there to help with.

A closing thought: none of these numbers need to be tracked with spreadsheets and formulas from day one. What matters most is building the habit of checking them regularly - monthly, at minimum - so problems surface as small course corrections rather than emergencies, and so you walk into that first meeting with an accountant speaking a language you both understand.

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