Cash Flow vs Profit: Why a Profitable Business Can Still Run Short of Cash

Two measures, two different questions

Profit asks whether the income recognised for a period exceeds the expenses recognised for that period. Cash flow asks what money arrived and what money left. Neither figure can do the other's job.

The British Business Bank explains that an otherwise profitable business can face a short-term cash shortage while it waits for customer payments. Seeing a healthy result in your accounts doesn't make that delay disappear.

Our example uses a simplified accruals-based management view: completed work counts as income before the invoice is paid. It isn't a tax calculation. If you use cash-basis records, ask your accountant how the reports differ before comparing figures.

A useful question for your next accounts discussion is: 'Which income in this report hasn't reached the bank yet?' Ask about expenses not yet paid too. That starts a conversation about the bridge between the figures, rather than an argument over which report is right.

A profitable month with only £200 left

Take a hypothetical small service company. It starts the month with £3,000 in cash, completes and invoices £8,000 of work, and incurs £5,000 of costs. All those costs are paid during the month. Customers pay £2,200 of the invoices before month end.

Assume no opening unpaid invoices or bills, no stock, no equipment purchases, no borrowing, no owner withdrawals and no other transactions. VAT, tax, depreciation and financing costs are excluded solely to keep the illustration simple. A real forecast must include relevant payments.

The company hasn't lost the £3,000 profit down the back of a sofa. Much of the sales value is still represented by unpaid invoices. Those amounts may be owed, but they aren't available to pay a supplier today.

There is another limitation: the month-end calculation doesn't tell us whether the balance dipped below zero earlier. If the £5,000 left before the £2,200 arrived, the company would already have faced a payment gap. Dates matter.

Put the next two weeks under a magnifying glass

Continue the example from its £200 closing balance. Assume £1,500 of the outstanding invoices will arrive in week one, with £1,200 of payments due. In week two, another £2,000 should arrive and £1,800 is due.

Week one's closing balance is £500: £200 plus £1,500 minus £1,200. Week two closes at £700: £500 plus £2,000 minus £1,800. On those assumptions, the weekly totals remain positive.

Now move the £1,500 receipt to week two. Week one falls to minus £1,000. Week two still ends at £700 because the total receipts haven't changed, but a later recovery doesn't pay the earlier bill.

The negative figure is an unfunded gap, not permission to spend below zero or evidence that an overdraft exists. This scenario assumes no facility. The owner needs to investigate the gap before the payment date, and may need a daily view if receipts and bills fall within the same week.

For each expected receipt, record whether the date comes from agreed terms, customer confirmation or a hopeful guess. That small note changes how much confidence you should put in the forecast.

Find the cause before choosing a response

If the problem is an invoice stuck in approval, ask who can resolve it and which document is missing. Our guide to late payments and unpaid invoices sets out a collection process. A reminder won't fix an incorrect purchase-order reference unless someone identifies the error.

If a new project needs substantial spending before payment, map that commitment before accepting it. The British Business Bank notes that growth can absorb cash through costs and customer credit. More work is not automatically more money available this week.

If costs consistently exceed the income earned from the work, collecting faster may help timing but won't repair the underlying margin. Keep the profitability question open. Conversely, a profitable job may still need a different payment schedule agreed in advance.

Borrowing isn't an automatic answer. Any proposed finance needs its own review of cost, repayments, conditions and affordability. If the business cannot meet obligations when due, seek prompt professional advice rather than relying on an optimistic forecast.

Build a forecast someone else can understand

The British Business Bank's forecasting guide uses expected receipts and payments across a chosen period. Cover at least the cash cycle, update assumptions and track the running balance. Include relevant tax, financing and other non-trading cash movements, not just sales and operating expenses.

Alongside the numbers, give each uncertain item an owner and a next check date. 'Payment expected Tuesday, Alex confirming with accounts payable on Friday' is more useful than 'customer will probably pay soon'.

Keep the original estimate when you replace it with an actual receipt. Otherwise, a forecast can look accurate simply because yesterday's wrong assumption has vanished. A short note lets you spot repeated delays without building an elaborate reporting system.

Reliable accounting records and responsibilities support this routine. When discussing figures with your accountant, bring the invoice list and bank transactions, not only a screenshot of the headline balance. Ask which differences need investigation before making commitments.

Frequently asked questions