Operating cash flow is the cash your trading brings in once you have paid the day-to-day costs of running the business, before anything you spend on equipment and before any borrowing. It is the figure that explains how you can be profitable on paper and still watch the bank balance fall: your profit counts a sale the day you invoice it, and your operating cash flow counts it the day the money lands.

Most of the gap between the two is money you have earned and not yet been paid. Our research, published in April 2026, found that 90% of UK businesses are affected by late payments, and that the average small business is owed £22,000. That bites hardest when a handful of large customers make up most of your sales, because then one of them paying later than agreed moves your whole figure.

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What is operating cash flow?

Operating cash flow tells you whether your trading pays for itself. It counts the money that actually reached your bank account from customers, takes off the money that actually left it on running costs, and ignores everything else.

Operating activities are your regular business pursuits, whether that is selling goods, manufacturing, or providing a service. For a small company the list is short: money in from customers, and money out to suppliers, staff, rent, and tax.

It focuses only on the core business, so two things sit outside it, and both exclusions are deliberate. The first is what you spend on long-term assets, which accountants call capital expenditure, or capex: anything you will use for more than a year, such as machinery, vans, or computers. Buy a van outright and the cash leaves your account, but your operating cash flow does not move, because capex sits under investing activities instead. The second is financing: money you borrow, money you repay, and dividends you pay out. A new loan can make your bank balance look healthy without your trading having earned a penny of it, which is why this figure leaves it out.

You will also see it called cash flow from operations, or shortened to OCF. They are the same figure.

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Where to find the figure in your accounts

On a full cash flow statement, operating cash flow is the line called 'net cash from operating activities'. If you have that statement, there is nothing to calculate.

Most small limited companies do not have one. Companies filing small-company accounts, and micro-entities, are not required to include a statement of cash flows, so it often is not prepared at all. For financial years starting on or after 6 April 2025, your company is usually small if it meets two of these three tests: turnover up to £15m, a balance sheet total up to £7.5m, and 50 or fewer employees.

If that is your company, you can work the figure out from the documents you already have: your profit and loss account, and your balance sheets for this year and last. Plenty of accounting packages will produce a cash flow report as well, and your accountant can prepare one.

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How to calculate operating cash flow

There are two accepted ways to calculate operating cash flow, and for a small company only one of them is realistic. The indirect method starts with the profit you already have, adds back the costs that never involved cash leaving the business, adjusts for the cash tied up in running it day to day, and takes off the tax you actually paid.

Operating cash flow = profit before tax + depreciation and amortisation ± changes in working capital − tax paid

The other route is the direct method, which adds up the cash you actually received from customers and takes off the cash you actually paid to suppliers, to staff, and on other running costs. It gives the same answer, but it needs a record of every cash movement over the year, which most small companies do not keep separately. That is why the indirect method is the common one: the figures it needs are already in your accounts.

Each of those inputs has a plain meaning and a specific home in your paperwork.

Then work through it in four steps.

1. Take your profit before tax from your profit and loss account.
2. Add back depreciation and amortisation.
3. Adjust for working capital. Subtract any increase in what customers owe you and in the stock you hold, because that is cash you have earned or spent but cannot use. Add any increase in what you owe suppliers, because that is cash still sitting in your account. Do the opposite for anything that fell.
4. Subtract the Corporation Tax you paid during the year.

Step three is the part worth slowing down on, and it is the one most explanations skate over. It is where most of the difference between profit and cash comes from, and it is the only step that needs two sets of accounts rather than one. Use figures from the same accounting period throughout, or the answer will not mean much.

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A worked example for a small limited company

It is easier to see in pounds. The figures below are illustrative, and they belong to a company that had a good year on paper.

One line does most of the damage. The £22,000 the customers had not paid is worth more than depreciation and supplier terms put together, and it is the only figure on the list that depends on somebody else's behaviour rather than your own.

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The operating cash flow ratio

The operating cash flow ratio compares the cash your trading produced with the bills you have to settle inside the next 12 months. It is a liquidity measure, and it is not the same thing as operating cash flow, which is a cash amount.

Operating cash flow ratio = operating cash flow ÷ current liabilities

Current liabilities are everything due within a year: suppliers, tax, and the next 12 months of any loan. The example company above owed £60,000, so its ratio is 0.8, because £48,000 divided by £60,000 is 0.8.

A ratio of 0.8 means one year's trading cash would cover about four-fifths of what is due in the coming year. It does not mean the company spends more than it makes, and on its own it is not a verdict. Most companies also have cash in the bank, money still to come in from customers, and stock to sell, and the ratio counts none of those.

As rules of thumb rather than a standard: a ratio comfortably above 1.0 suggests your trading covers short-term commitments with room to spare, and one well below 1.0 is worth looking into. The comparison that tells you most is with your own previous years, not with another company. A ratio measured over a single quarter will usually look low, because a quarter of trading is being set against a full year of liabilities, so compare a quarterly figure with the same quarter a year earlier.

The ratio earns its keep at two moments. If you are weighing up an expansion or an acquisition, it tells you how much of it your trading could fund without borrowing. And if it keeps coming out low while sales hold up, the problem is usually collection rather than trading, which makes it a credit control question.

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How it differs from profit, EBITDA and free cash flow

Four measures sit close together in a set of accounts, and what each one leaves out matters as much as what it counts.

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What negative operating cash flow means

If the figure comes out negative, more money went out of your business than came in from trading over the period. That is not the same as making a loss, and the two often happen separately: a growing company can be comfortably profitable and still go backwards on cash, because it pays for stock and staff months before its customers pay it.

It is also more common than most directors assume. Our research, from a survey of 1,005 small business owners published in April 2026, found that 60% have more money going out than coming in for at least half of the year. A single negative period, in a business that knows why, is ordinary. It bites hardest where income is seasonal, or where one or two large customers make up most of the sales, because one late payment then moves the whole figure.

What matters is the pattern rather than the month: several periods in a row, a figure that falls while sales stay flat, or a gap you cannot account for. Those are the points at which it is worth working through the cash flow problems behind the number.

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How to improve cash flow from operations

Three things move this figure, and all three are about timing rather than sales: how quickly your customers pay you, how long your cash sits in stock, and how long you have to pay your suppliers. Working through them in that order tends to free up the most cash for the least disruption.

1. Invoice the day the work is done, chase before the due date rather than after it, and look at whether your payment terms are longer than they need to be. A small discount for early payment can be worth more than the margin it costs, and a credit check before you take on a large new customer costs very little. Our guide to getting customers to pay goes further on the overdue ones.
2. Compare the stock you hold with what you actually sold last quarter. Stock ties up cash until it sells, and slow-moving lines hold on to more of it than you might expect.
3. Ask your longest-standing suppliers about longer payment terms. Where the relationship allows it, this is the one lever that improves your cash position without anyone else having to change their behaviour. Paying a supplier early does the opposite: it is good practice, but it reduces this figure in the period it happens.

All three take time to work, and none of them helps with an invoice that is already overdue. If you're waiting on an invoice, a Flexi-Loan can cover the gap, and you can clear it with no early repayment fee once your customer pays. It is a business loan with flexible repayment options, so the borrowing can end when the money you were waiting for arrives. What it cannot do is change what your trading generates, so it suits a gap with a clear end rather than a figure that is negative because the trading itself does not cover its costs, and that matters most when your margins are already thin.

TDSS UK, Morris Yudu's shipping and logistics business, used one to pay its suppliers upfront, load a container, and invoice the same day, turning a six-week wait between doing the work and being paid into a wait of days.

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How often to look at it, and what it will not tell you

Monthly is enough for most companies, compared with the same month a year earlier rather than with last month. A quarter is the shortest period that tells you much, and a full year is what a lender or an investor will usually want to see.

Looking at it at all puts you ahead of most. Our research, published in April 2026, found that only 26% of small businesses forecast their cash flow monthly, while about one in five do it annually or never. That leaves most owners finding out about a shortfall when it arrives rather than before. The cost is highest in businesses with a long gap between paying for work and being paid for it, because the signal takes months to reach the bank balance.

Tax timing is the main reason a single month misleads. Corporation Tax is due nine months and one day after the end of your accounting period, so one month a year carries a bill earned in a different year entirely. A VAT return and its payment are usually due one calendar month and seven days after the period ends, which puts a lump sum into four months of the year. Neither is a sign of anything, and both will distort a monthly figure read on its own.

There are three things this figure cannot tell you. Whether you can afford a van, because that is capital expenditure and sits outside it. Whether you will have cash on a particular Friday, because it looks backwards at a whole period rather than forwards at a date. And whether you are profitable, because a good month for cash can follow a bad month for trading. For the week-by-week view you need a forecast, which is the job of cash flow management rather than of this figure.

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Operating cash flow FAQs

Is operating cash flow the same as EBIT?

No. EBIT, or earnings before interest and tax, is a profit measure taken from your profit and loss account, so it counts income you have invoiced but not yet collected and it ignores changes in working capital. Operating cash flow counts only cash that moved.

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Are dividends received an operating cash flow?

Usually not. Dividends your company receives from shares it holds are normally shown under investing activities, because they come from an investment rather than from trading.

The accounting standards do allow them to be classified as operating instead, so it is worth checking which your accounts use. Dividends your company pays out to its own shareholders sit under financing activities, so those are outside operating cash flow either way.

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Is interest paid part of operating cash flow?

It depends on how your accounts are prepared. Interest paid can appear under operating activities, where it is already inside operating cash flow, or under financing activities, where it is not. It is worth checking which treatment your accounts use before comparing one year with another.