Why cash flow matters more than your margin: The strategic decision most business owners miss

I was having coffee with a client last week. She’d just spent three hours negotiating with a packaging supplier. Back and forth on email, then a phone call, then more emails. She’d got them down 5% on their original quote. She was pleased with herself. She’d protected her margin – success.

“That’s great,” I said. “When did you last look at your aged debtors report?”

Silence.

Turns out she had £18,000 worth of invoices just sitting in her system. Not sent. Plus another £8,000 owed from last month that she hadn’t chased. “They’re good clients,” she said. “They’ll pay eventually.”

And £22,000 worth of stock sitting in the warehouse for six weeks because she hadn’t got round to the marketing campaign she’d planned.

I didn’t say what I was thinking, which was “Goodness, you’ve just spent three hours to save maybe £200 while nearly £50,000 is just … sitting there doing absolutely nothing.”

What I actually said was “Hmmm, I’m not sure the packaging discount is where your biggest opportunity is right now.”

The thing nobody tells you about running a business

When I was running my ice cream business, I was obsessed with margins. I’d spend ages working out exactly how much each scoop cost me. I had spreadsheets. I had systems.

But it wasn’t the margins that were the problem.

The margins were fine. The real problem was I had no idea what my cash flow looked like from one week to the next. I’d have a great week of sales, feel flush, spend money on supplies. Then two weeks later I’d be scrambling to make payroll..

It was exhausting … and lonely. I felt completely out of control, like I’d created a monster that was consuming everything – my time, my energy, my family life.

And I thought it was just me being rubbish at business.

What successful businesses understand

Years later, now that I’m a CFO and work regularly with business owners on their finances, I see this pattern everywhere. Smart people who can tell you their margin to two decimal places but have no real grip on their cash flow.

A 5% margin improvement is great. But it’s meaningless if the invoice goes out two weeks late and gets paid a month after that. The price you charge matters less than how quickly you turn that price into actual cash you can use.

The reactive decision trap

I was approached by a tech start-up last week. A great product that could really make waves. They’ve invested in getting things set up properly – talented team, website, CRM, marketing, office space.

But for two quarters running, they’ve been surviving on VAT refunds and credit cards, as well as some additional lending secured with personal guarantees. They’re betting everything on a couple of big contracts landing.

It could all work out fine, but what if those contracts take three months to negotiate instead of three weeks? What if payment terms are 45 days from invoice?

In situations like this a cash flow forecast is key. It gives you confidence, the confidence not to make reactive decisions, not to accept unfavourable terms, not discount to get cash in. It enables you to think strategically.

The impact of not understanding your cash flow

Cash flow pressure shows up as:

• Short-term borrowing at high interest rates because you need cash now
• Discounting you can’t afford to get money in faster
• Accepting unfavorable payment terms because you need the work
• Missing supplier discounts because your cash is too tight
• Saying no to growth opportunities because you can’t fund them
• Constantly firefighting instead of building

The businesses that avoid this trap treat cash flow as strategic, not operational. They work to generate cash from within the business by focusing on:

Getting invoices out faster. Not just “when the work is done” but actively planning the invoicing schedule. For longer projects, they invoice at milestones. Cash comes in throughout, not in one lump weeks later.

Getting paid faster. Following up on overdue invoices within days. Making it easy to pay. Thinking about the payment process from the customer’s perspective.

Moving stock faster. For product businesses, cash tied up in unsold stock is cash you can’t use. Better forecasting, marketing and stock turnover aren’t just sales issues – they’re cash flow issues.

Spending strategically. Timing sales and expenditure deliberately so that cash comes in ahead of big spending commitments.

Building buffers before you need them. When cash is strong, that’s when you build reserves. Businesses that weather storms prepare during calm weather.

What this looks like in practice

You don’t need complex systems. Just think about cash flow as strategically as you think about pricing.

Forecast your cash 13 weeks ahead. That’s a full quarter, which gives you enough visibility to spot problems early while keeping forecasts accurate. Not a detailed P&L. Just what cash is coming in, what’s going out, and what you’ll have left each week. Update it weekly. You’ll spot problems well before they arrive, when you still have options.

Measure the gap between invoice and payment. If your terms are 30 days but the average is 45, that 15-day gap is where your cash is leaking. Fix the gap and you’ve given yourself a cash flow boost without changing your business model.

Use cash flow as a decision-making filter. Before committing to anything – new hire, marketing spend, new product line – ask: how does this affect cash, and when? Not just: will this be profitable eventually? But: can we afford the cash timing?

The strategic advantage nobody talks about

Businesses who get this operate differently. They’re calmer. More confident. They make better decisions because they’re not making them under pressure.

They don’t panic when a big client pays late – it’s irritating but not terminal, because they’ve forecasted conservatively and built buffer.

Better cash flow management doesn’t just prevent crisis. It creates strategic advantage. It gives you options. And that advantage compounds over time in ways that a 5% margin improvement never will.

So the next time you’re spending three hours negotiating a small discount, ask yourself: is this where my biggest opportunity actually is? Or am I focusing on the wrong thing, avoiding addressing the real issue.

Understanding your cash flow is probably the most valuable thing you can do for your business. Even if it doesn’t feel as immediately satisfying as getting 5% off your packaging.