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

Profit measures revenue after the relevant expenses have been deducted. Cash flow measures money entering and leaving a business during a period. A business can report a profit while lacking enough cash to pay its bills because earning revenue and receiving payment do not necessarily happen at the same time.

Understanding the difference starts with keeping track of business receipts and payments. If you are reviewing where to receive and manage company funds, you can explore the Sends business account. Account transactions provide part of the financial picture; understanding profit also requires the business’s accounting records.

What is the difference between cash flow and profit?

Profit and cash flow answer different questions.

A positive cash flow increases the cash balance, assuming no other reconciling movements. A negative cash flow reduces it. Neither figure, by itself, tells you the business’s profit. Business Wales explains that a company can make an accounting profit while experiencing negative cash flow and difficulty paying its bills. 

The reporting period matters. Compare profit and cash flow for the same month or quarter before investigating why they differ.

Why does the accounting method matter?

Under accrual accounting, revenue and expenses are recorded when they are earned or incurred. Their recognition can therefore precede the related cash receipt or payment.

A company might complete work in September, recognise the revenue in September and receive the customer’s payment in October. September’s profit can include that revenue even though the September account balance does not include the money.

Cash basis accounting records income and expenses when money moves. Business.gov.uk distinguishes these approaches and states that UK limited companies must use traditional accounting. The unpaid-invoice example in this article follows accrual accounting. 

Even when records use a cash basis, a business account balance is not a profit calculation. Receipts can include borrowing, and payments can include amounts whose accounting treatment differs from ordinary operating expenses.

A worked example: £8,000 profit and a £2,000 cash shortfall

Consider a hypothetical service company planning its month-end payments.

The company starts the month with £5,000 in cash. It completes and invoices £20,000 of work that qualifies for revenue recognition during the month. Customers pay £5,000, with the remaining £15,000 expected later.

The company incurs £12,000 of expenses, all due for payment before the month ends.

This simplified illustration excludes VAT, tax, depreciation, borrowing and other transactions. The figures are assumptions used to demonstrate the calculation, not results from a real company.

The profit calculation is:

£20,000 revenue − £12,000 expenses = £8,000 profit before tax.

The cash calculation is:

£5,000 opening cash + £5,000 receipts − £12,000 payments = −£2,000.

The negative projected balance represents a funding shortfall. Without additional receipts, existing credit or another change, the company cannot make every payment when due. The calculation does not assume that its account can automatically go overdrawn.

The missing £15,000 remains a customer receivable. When the customer eventually pays, the company receives cash against revenue already recognised. Collecting the invoice does not create the same revenue a second time.

The distinction is practical: the company’s completed work produced an accounting profit, but the payment timetable leaves it short of money.

What else makes profit different from cash flow?

Unpaid customer invoices explain one difference. Other transactions affect the figures in different ways.

Stock purchases can use cash before the stock is sold

A business may pay for inventory that remains unsold at the end of the month. Under accrual accounting, closing inventory affects the calculation of cost of sales; the cash payment and the expense recognised for goods sold can therefore fall in different periods.

Equipment purchases and depreciation follow different timelines

Buying equipment can require a cash payment at the time of purchase. Where the equipment is recognised as a non-current asset, depreciation spreads its cost through accounting periods.

Depreciation reduces accounting profit without creating a new cash payment each time the depreciation charge is recorded. 

Borrowing increases cash without creating sales revenue

A loan brings money into the business, but the receipt is financing rather than revenue from customers. Repaying the loan principal uses cash and reduces the borrowing balance. Interest has a separate accounting treatment.

ACCA distinguishes financing cash flows, including new borrowing and debt repayments, from the cash generated by operating activities. 

Paying a bill later can temporarily preserve cash

An expense can belong to the current accounting period even when the business has not paid it yet. The unpaid amount remains a liability. A higher cash balance caused by unpaid bills does not remove those obligations. 

Can cash flow be positive while the business makes a loss?

Yes. Cash can increase for reasons other than profitable trading.

For example, consider another simplified scenario in which a business receives £4,000 from customers, pays £6,000 in operating expenses and receives a £5,000 loan. Assume all sales and operating expenses relate to the same period, with no other items.

The operating result is a £2,000 loss. Total cash nevertheless increases by £3,000 because the borrowing exceeds the operating cash shortfall.

The source of the cash increase therefore matters. ACCA’s guidance on analysing cash flow statements emphasises examining operating, investing and financing movements rather than treating an increase in cash as sufficient evidence of good performance.

A loan receipt, an asset sale and a customer payment can all increase cash, but they describe different business events.

How to check whether the business can meet upcoming payments

Use a cash flow forecast alongside the profit and loss statement.

A practical forecast begins with the opening cash balance, adds expected receipts and subtracts expected payments. Put each amount in the week or month when the money is expected to move.

For customer invoices, use the expected receipt date. For supplier bills and other commitments, use the expected payment date. Carry each period’s closing balance into the next period as its opening balance.

The forecast should extend far enough to cover the business’s cash flow cycle. British Business Bank recommends planning around that cycle and recording receipts when the cash is expected to reach the account. 

Review three questions together:

• Profitability: Does recognised revenue cover the relevant expenses?

• Collection: When are customers expected to pay amounts already earned?

• Payment capacity: Will the available cash cover obligations when they fall due?

If an expected customer receipt moves to a later date, update the forecast and check the intervening balances. A month-end total can conceal a shortfall earlier in the month, so use shorter periods where payment timing requires closer attention.

Profit shows whether the business earns more than the relevant expenses. Cash flow shows how money moves, and the cash balance shows what remains. Reading all three together explains why a profitable business may still need to address a payment shortfall.