Your working capital cycle is the number of days your cash stays tied up in trading before it comes back from sales. It starts when you pay for stock, materials or labour, and it ends when the customer’s money reaches your account. The formula is DIO + DSO − DPO: the days your stock sits, plus the days your customers take to pay, minus the days you take to pay your own suppliers.
A profitable business can still run short of cash when too much of its trading income is tied up in stock and unpaid invoices. The working capital cycle measures that delay, showing why the profit in your accounts may not yet be money you can spend.
What the Working Capital Cycle Is
Picture the cycle as a loop your money travels. Cash buys stock or pays for the work, the stock or the work becomes a sale, the sale becomes an invoice, and the invoice eventually becomes cash again. Supplier credit runs the other way and shortens the loop, because for part of that time you are trading on your suppliers’ money rather than your own.
The shorter the loop, the less of your own capital is committed to it at any one time. A long loop can suit a viable business, but it leaves more of your turnover tied up in stock and unpaid invoices. That gap has to be covered from reserves, supplier credit or finance until the customer pays.
You will also see this called the cash conversion cycle. The two terms describe the same measurement, and we use them interchangeably because the calculation does not change with the name.
The Stages of the Cycle
The cycle has four stages and only one of them brings money in. Procurement starts it: you pay suppliers for stock, materials or subcontracted work, so cash leaves before anything has been sold. Holding comes next, and this is where the money goes quiet. Materials sit in the yard, jobs sit half-finished, finished goods sit on the shelf, and none of it can pay a wage.
The sale is the third stage, and it may not end the cycle at all. Take the payment at the till and the loop closes on the spot. Invoice on 30-day terms and the sale is booked, the stock has gone, and the cash still has not arrived. Collection is the last stage, and on a credit sale it keeps that money unavailable until the invoice is paid. A business can therefore be turning over more than ever while still checking the balance before releasing its next purchase order.
How to Calculate Your Working Capital Cycle
The calculation combines the time spent holding stock and waiting for customers, then deducts the time your suppliers give you to pay. Your annual accounts contain the main inputs, although credit sales and credit purchases may need to come from the underlying ledgers.
Working Capital Cycle = DIO + DSO − DPO
Days Inventory Outstanding, plus Days Sales Outstanding, minus Days Payables Outstanding. The answer is a number of days.
The three components use different denominators. Mixing them up will not break the arithmetic, but it will distort the answer and can make the cycle look shorter than it is. We have used the methodology set out in ACCA’s working capital management guidance throughout.
Calculate Days Inventory Outstanding
DIO = Average Inventory ÷ Cost of Goods Sold × 365
This is how long stock sits with you before it sells. Use the average of your opening and closing inventory rather than the year-end figure alone. We use average inventory because a year-end balance captures one date, and for many businesses that date does not represent the stock held through the rest of the year. The denominator is cost of goods sold, not revenue. Inventory is carried at cost, so matching it against a figure that includes your margin understates the days.
If you manufacture, your inventory has three parts: raw materials, work in progress, and finished goods. ACCA treats each as its own holding period, and it is worth splitting them out at least once, because the cash is committed from the moment the raw materials arrive rather than from the moment there is something saleable in the warehouse.
Calculate Days Sales Outstanding
DSO = Average Trade Receivables ÷ Annual Credit Sales × 365
This is how long your customers take to pay you. The denominator is credit sales, not total revenue, and we flag using total revenue as an important source of error when the calculation is built from annual accounts. Only credit sales create receivables. If a third of your turnover is taken at the counter or on card at the point of sale, that third never sits in the debtor book, so dividing by total revenue spreads your receivables across sales that were never waiting to be paid and hands you a shorter DSO than you actually have.
Where your accounting system cannot separate credit sales from total revenue, total revenue works as a practical proxy and will get you a usable number. Treat it as an approximation rather than the same calculation, and expect it to flatter you by more the larger your share of immediate or cash sales.
Calculate Days Payables Outstanding
DPO = Average Trade Payables ÷ Annual Credit Purchases × 365
This is how long you take to pay your own suppliers, and it is the only component that works in your favour. Credit purchases is the correct denominator for the same reason credit sales is correct above: only purchases made on terms create payables.
Annual credit purchases is the figure most owners cannot pull straight out of their accounts, because it is rarely a line in the statutory format. Cost of sales is the standard approximation and we use it as the fallback here, as ACCA does. It will be close for a business that buys most of its cost of sales on credit and less reliable for one whose cost base is heavily payroll, since wages are not trade credit and never appear in payables.
Which Figures Should You Use From Your Accounts?
A cycle number is only useful if the balances behind it represent how your business actually trades. We check each point below before drawing conclusions from the result:
- Average, not year-end. Add the opening and closing balance and halve it. For inventory and receivables in particular, the year-end figure is often the least typical one in the year.
- Credit sales for DSO. Take it from your sales ledger rather than your P&L. If you cannot split it, use total revenue and label the result an estimate.
- Credit purchases for DPO. Use cost of sales if the purchase figure is not available, and remember that payroll-heavy cost bases distort it.
- Trade balances only. Strip VAT, PAYE, corporation tax and director loans out of payables. They are real liabilities, but they are not supplier credit and they do not belong in this calculation.
- Watch the season. A single annual calculation on a seasonal business tells you about one day of the year. If your stock peaks before Christmas or your receivables peak after a summer contract season, calculate the cycle quarterly instead.
Working Capital Cycle Example
Take a wholesaler with £730,000 of annual credit sales, £365,000 of cost of goods sold and £292,000 of annual credit purchases. We calculated every figure below with the formulas above and used round numbers so you can follow how each input changes the result.
Step 1: Calculate DIO.
Average inventory across the year is £60,000, against cost of goods sold of £365,000.
£60,000 ÷ £365,000 × 365 = 60 days. Stock sits for two months before it sells.
Step 2: Calculate DSO.
Average trade receivables are £70,000, against annual credit sales of £730,000.
£70,000 ÷ £730,000 × 365 = 35 days. This example assumes 30-day payment terms, so customers are paying, on average, about five days late.
Step 3: Calculate DPO.
Average trade payables are £32,000, against annual credit purchases of £292,000.
£32,000 ÷ £292,000 × 365 = 40 days. Suppliers are funding the business for forty days at a time.
Step 4: Calculate the Full Cycle
| Component | Inputs | Result |
|---|---|---|
| DIO | £60,000 inventory ÷ £365,000 COGS × 365 | 60 days |
| DSO | £70,000 receivables ÷ £730,000 credit sales × 365 | 35 days |
| DPO | £32,000 payables ÷ £292,000 credit purchases × 365 | −40 days |
| Working capital cycle | 60 + 35 − 40 | 55 days |
A fifty-five-day cycle means the business waits roughly eight weeks to recover the cash committed to stock, after allowing for supplier credit. That does not show that the business is in trouble, but it does show the funding requirement: reserves or a finance facility must cover the gap each time the cycle begins again.
What the Result Means in Pounds
The more useful result is the amount of cash tied up and the value of improving each component by one day. Stock, receivables and payables have different daily values because each is measured against a different annual figure:
| One day of… | Calculated as | Is worth |
|---|---|---|
| DIO | £365,000 COGS ÷ 365 | £1,000 of inventory |
| DSO | £730,000 credit sales ÷ 365 | £2,000 of receivables |
| DPO | £292,000 credit purchases ÷ 365 | £800 of supplier credit |
Put the three together and we can show the capital the cycle is actually holding: £60,000 in stock plus £70,000 in receivables, less the £32,000 your suppliers are funding, is £98,000 tied up in trading. We put more weight on the £98,000 than the 55 days because it shows the working capital this business must fund simply to keep trading at its current level. It is roughly one and a half months of turnover, and it does not appear as a cost anywhere in the accounts.
Notice that a day of receivables is worth twice a day of stock here. That is not a general rule. It is arithmetic specific to this business, and it is exactly why generic advice to chase your debtors first can send you after the smaller number.
Working Capital Cycle Calculator
Put your own six figures in and the calculator returns your cycle, what each component contributes, what one day of each is worth, and how much cash a realistic improvement would release. We build every number below with the formulas set out above, and we list our assumptions under the results so you can check the working.
| Component | Days | One day is worth |
|---|---|---|
| Days Inventory Outstanding | 60 | £1,000 |
| Days Sales Outstanding | 35 | £2,000 |
| Days Payables Outstanding | −40 | £800 |
On these figures, receivable days are your largest lever.
What would an improvement release?
Assumptions. A 365-day year. DIO uses average inventory against cost of goods sold; DSO uses average trade receivables against annual credit sales; DPO uses average trade payables against annual credit purchases. Cash tied up is inventory plus receivables less payables. The released figure is a one-off release of capital as the balances fall to their new level, not a recurring annual saving. Extending payables defers an outflow rather than releasing cash you already hold, so it is shown separately in the working.
What a Healthy Cycle Looks Like
There is no single good working capital cycle. We do not publish a universal benchmark because sector, payment model, stock requirements and supplier terms change the result too much for one figure to be useful. Judge whether your cycle is sustainable and whether it is improving against your own history.
A positive cycle means you pay for at least some of what you sell before the customer pays you. It is the normal position across manufacturing, wholesale, construction and most B2B services, and it is not a problem in itself. It is a funding requirement that needs to be recognised and covered.
A near-zero cycle means supplier payments and customer receipts land at roughly the same time. The business largely funds its own trading as it goes.
A negative cycle means the customer’s money arrives before the supplier’s bill falls due. Supermarkets are the textbook case: fast-moving stock, card takings that settle in a day or two, and long agreed terms with growers. ACCA gives the same example.
A negative cycle is an advantage when it comes from rapid stock turnover, payment up front, subscriptions, deposits or genuinely negotiated supplier terms. Our judgement changes when it comes from paying suppliers later than agreed. That is unsecured borrowing from businesses that never agreed to lend, and the likely consequences are worse prices, shorter terms or demands for payment on delivery.
We recommend comparing yourself in this order: your own trend first, then businesses with the same payment model, then sector evidence. Your own trend is the only comparison where the accounting treatment, the customer mix and the payment terms are guaranteed to be alike.
How Working Capital Cycles Differ by Business Type
Your payment model, stock requirements and supplier terms decide which part of the cycle holds the most cash. The formula stays the same, but the useful lever changes with the business.
Retail and Ecommerce
Money comes in at the point of sale, so DSO is small, often just the day or two a card acquirer takes to settle. The cycle is driven almost entirely by how long stock sits and how long suppliers wait. Turn stock quickly on decent terms and you can run at or below zero. The risk sits in the stock itself: buy the wrong lines and your DIO climbs while the money that bought them is unavailable for the lines that were selling.
Two things distort the reading for retailers more than for anyone else. The first is promotional buying, because a bulk deal that improves your margin also parks a lot of cash on a pallet, and the cycle will tell you the true cost of that discount in a way the purchase invoice will not. The second is the year end: most retailers choose a quiet month for it, so the annual calculation captures the business at its leanest stock level and misses the peak entirely.
Marketplace and dropship models sit differently again. If the platform holds the stock and settles with you on a fortnightly cycle, your DIO can be near zero while your DSO is set by somebody else’s payment run, and the lever you actually have is the settlement frequency in the contract rather than anything happening in a warehouse.
Manufacturing
The cash goes out at the raw-material stage, well before there is anything saleable. Split inventory into raw materials, work in progress and finished goods, because a long production run can hide most of the commitment in the middle component where it is easiest to overlook. Add B2B credit terms on the sales side and manufacturing routinely runs the longest cycles of any sector.
Work in progress is easy to measure badly because accounting systems do not always value it as costs build. If your costing only recognises labour and overhead when a job closes, your WIP balance understates what is already committed and makes the cycle look shorter. Agree the valuation basis with your accountant, then use the same basis each time so the trend remains meaningful.
We put lead time ahead of stock policy as the manufacturing lever with the widest effect. Shortening a production run reduces raw materials, work in progress and finished goods together, because each day removed releases cash from all three. This improves the process itself rather than relying only on smaller purchases.
Construction and Project Businesses
The standard formula fits these businesses worst. Mobilisation costs land before any valuation is certified, stage payments arrive on someone else’s timetable, retention is held for months after practical completion, and subcontractors expect paying long before the main contract settles. Work in progress and amounts recoverable on contracts do the job inventory does elsewhere. Calculate the cycle by all means, but read it alongside the retention ledger and the certification dates rather than on its own.
We recommend separating retention before drawing conclusions from a construction cycle. Money held back at 5% for twelve or twenty-four months after completion is not a receivable behaving normally; it is a long-dated asset sitting in a short-term line, and averaging it into your DSO buries a structural funding requirement inside what looks like a collection problem. Track retention on its own schedule, with its release dates against it.
The mismatch that actually causes the trouble is the one between certification and subcontract terms. If a valuation takes a month to certify and thirty days to pay while your subcontractors are on fourteen-day terms, you are funding the difference on every project simultaneously, and the exposure scales with how many jobs you are running rather than with turnover.
Service Businesses With No Inventory
If you hold no material stock, your DIO is effectively zero and the calculation still works: the cycle becomes DSO minus DPO. An agency invoicing on 30-day terms and paying its freelancers on 14 has a positive cycle of a couple of weeks even though it never buys a thing it can put on a shelf.
Service businesses need to read the result alongside payroll, because wages do not appear in the formula. Payroll is not trade credit, so it never reaches payables and still leaves on its scheduled date when customers are late. A consultancy with a 45-day DSO is funding six weeks of salaries before the related cash arrives, which means a low cycle can still hide substantial pressure on the bank balance.
Retainers and subscriptions flip the picture completely. Bill monthly in advance and the cash arrives before the work is done, which puts the cycle at or below zero and funds the payroll it is about to consume. We treat the timing of billing as a decisive difference between an agency paid after completion and one paid in advance on a retainer, because it changes who funds the work before payroll falls due.
How to Shorten the Cycle
Three levers, one per component, and every one of them has a cost attached. Work out which lever is largest for you before you pull any of them. On the wholesaler above, ten days off stock is worth £10,000 and ten days off debtors is worth £20,000, and on a different set of accounts that ranking reverses.
Reduce Inventory Days
Better demand forecasting, shorter procurement lead times and tighter reorder quantities all pull DIO down. Forecasting will not rescue stock that is unlikely to sell at the value recorded in your accounts, however. Identify those lines separately and decide whether clearing them now will release more useful cash than holding out for the original price.
The trade-off. Cut too hard and you buy stock-outs, disrupted production and lost sales, which cost far more than the working capital they free up. Overstocking is the more usual failure, and growing businesses in particular tend to fund stock that will sell in three months with cash they need this month, but the correction has a floor, and it is set by your service levels rather than by your balance sheet.
We recommend starting with where the inventory days actually sit, because a total figure cannot show which lines are holding the cash. Rank your lines by the cash tied up in each and how long it has been sitting. In most stockholding businesses, a small group of overlooked slow lines accounts for a disproportionate share of the balance, while the fast movers you worry about most are barely touching it.
Reduce Receivable Days
Invoice on the day the work is done rather than at month end, state terms on the order and not just on the invoice, take deposits or stage payments on large jobs, automate the reminders, and deal with queries the day they are raised. We put disputed invoices near the top of the collection list because an ordinary overdue invoice is chased, while one held behind an unanswered query can sit untouched. Resolve the query first or the reminder process will keep chasing a debt the customer is not ready to approve.
The trade-off. Push too hard on a customer who represents a third of your turnover and you may win thirty days and lose the account. Early-payment discounts work, but they are expensive money. Offering 2% to be paid 30 days early costs roughly 25% a year on the sum involved, which is a rate worth comparing against what a facility would charge you for the same thirty days.
UK working capital snapshot: late payment
Research by London Economics for the Department for Business and Trade and the Office of the Small Business Commissioner found that UK businesses are owed an estimated £26 billion in late payments at any one time, averaging £17,000 per affected business. Over 1.5 million businesses, 28% of the total, are affected each year, and around 14,000 close annually as a result: 38 every day. Among businesses that reported spending staff time chasing, the average was 86 hours a year.
The Commercial Payments Bill, introduced to Parliament in May 2026, would cap large firms’ payment terms to smaller suppliers at 60 days and require interest on late payments at 8% above the Bank of England base rate, which stood at 3.75% in August 2026. It is not yet law, it will not apply retrospectively, and the Government has said there will be a lead-in period before the powers commence. Do not build a cash-flow forecast on it.
Source: Office of the Small Business Commissioner / Department for Business and Trade, research published 31 July 2025. Sample: UK businesses across all sizes. Bill status and Bank Rate checked 19 August 2026.
Manage Payable Days Responsibly
The legitimate version of this lever is negotiation: ask for longer terms, align payment runs with the dates cash actually arrives, and use the credit your suppliers have already agreed to give you rather than paying every bill the week it lands. Paying early for no reason is a real and common leak. A good quarter tempts people to clear the ledger, and the money goes out weeks before it had to.
The trade-off can damage the supplier relationship. Paying later than agreed is not working capital management. You can lose early-settlement discounts and priority when stock is short, while ACCA’s guidance identifies the likely end point: a supplier that has been kept waiting may demand cash on delivery.
Given what the late-payment figures above do to the businesses on the receiving end, treating your suppliers as a free overdraft is also the thing you are complaining about when your own customers do it to you. Optimise the terms you have agreed. Do not optimise the agreement. I would not run a business on supplier money that was never offered, and the figures above are the reason why.
When you ask for longer terms, the discussion starts with whether you have honoured the terms you already have. Moving a reliable payer from 30 days to 45 is a different request from formalising payments that already arrive at 52 days. If you want more time next year, paying exactly on time this year gives you a better case.
How Growth and Seasonality Affect the Cycle
Cycle length and total cash requirement are two different things, and confusing them is how profitable businesses run out of money while growing. Hold the cycle at a perfectly respectable 45 days and double your sales, and you have not become less efficient by a single day, but the stock and receivables needed to support that trading have roughly doubled, so the cash locked in the cycle has roughly doubled too. The ratio looks stable while the requirement climbs.
That is overtrading, and we flag it because the usual signs of growth can hide the cash pressure. Orders rise, the pipeline fills and the accounts show a good year, while the bank balance keeps tightening. The extra stock and receivables must be funded before the growth produces cash of its own.
Seasonality creates the same problem on a shorter timescale. A single year-end calculation describes one day out of 365, and that date may fall well outside your busiest trading period. Stock can peak before the rush, receivables after it and supplier credit in between, leaving the annual figure blind to the point when funding pressure is highest. If your trade has a season, run the numbers quarterly and plan against the worst quarter rather than the average.
Working Capital Cycle and Funding
We recommend fixing avoidable inefficiencies before paying to finance them. A facility that covers poor credit control makes the delay affordable but leaves you paying for it each month. Once invoicing, collection and stock management are working properly, any remaining gap is more likely to come from the business model, seasonality or growth, where finance can be a reasonable commercial choice.
If a funding gap remains, identify which part of the cycle is holding the cash before choosing how to finance it. Different bottlenecks call for different products:
| Where your cash is stuck | What the number looks like | Route worth investigating |
|---|---|---|
| Unpaid B2B invoices | High DSO, healthy DIO | Invoice finance |
| Stock and supplier payments | High DIO, low DPO | Trade or stock finance |
| The whole cycle, repeatedly | Long cycle, recurring gap | Business line of credit or revolving credit facility |
| Card-led trading | Minimal DSO, seasonal swings | Merchant cash advance, where the structure genuinely fits |
We recommend matching the finance to the stage holding the cash, because that avoids using a broad facility for a narrower problem. Our working capital finance guide explains the available products and their costs.
Working Capital Cycle FAQs
Is the cash conversion cycle the same as the working capital cycle?
Yes. Both names describe the days between paying your suppliers and collecting the cash from the resulting sales, calculated as DIO + DSO − DPO. The name changes, but the formula and the result do not.
Is the operating cycle the same as the working capital cycle?
No, and this one catches people out. The operating cycle is DIO + DSO, the time from receiving stock to collecting the cash. The working capital or cash conversion cycle then subtracts payables days to allow for the credit your suppliers give you. The operating cycle is always the longer of the two.
What is the difference between working capital and the working capital cycle?
Working capital is an amount: your current assets less your current liabilities, measured in pounds at a point in time. The working capital cycle is a duration, measured in days. One tells you how much short-term resource you have; the other tells you how long your cash is committed before it comes back.
Can a service business calculate a working capital cycle?
Yes. With no material stock your DIO is effectively zero and the cycle is simply DSO minus DPO. Bear in mind that payroll, usually the largest outflow in a service business, is not supplier credit and never appears in payables, so the cycle alone will understate the funding pressure.
Can a negative working capital cycle be a bad sign?
It can. A negative cycle produced by fast stock turnover, upfront payment or genuinely agreed supplier terms is an advantage. A negative cycle produced by paying suppliers later than you agreed is borrowed time, and it usually gets repaid through worse prices, shorter terms or a supplier who wants cash on delivery.
Is a shorter working capital cycle always better?
No. Shortening the cycle by holding too little stock causes stock-outs and lost sales; shortening it by pressing customers too hard costs accounts. The aim is the shortest cycle your service levels and customer relationships can sustain, not the shortest cycle arithmetically available.
How often should I calculate my working capital cycle?
Annually as a minimum, and quarterly if your trade is seasonal or you are growing quickly. A single year-end calculation describes one day of the year, and it is usually a quiet one.
Why is my business profitable but short of cash?
Because profit is recorded when you invoice and cash arrives when you are paid. A long working capital cycle parks the difference in stock and receivables. The wholesaler in our example is profitable and still has £98,000 permanently committed to trading, and none of that money is available for wages this month.
What happens to the working capital cycle when a business grows?
The cycle length often does not move at all, while the cash it consumes rises in step with sales. That is overtrading, and it is why a growing business can need more funding in a good year than a flat one.
How we built and checked this guide
Scope. We set out what the working capital cycle is, how to calculate each component from a set of statutory accounts, how to read the result, how it varies by business model, and which type of finance suits which bottleneck. We checked our formula methodology against ACCA’s working capital management technical article, including its treatment of manufacturing inventory and its caution on stretching supplier payments.
Formulas and assumptions. DIO uses average inventory against cost of goods sold. DSO uses average trade receivables against annual credit sales, with total revenue named as a proxy where credit sales cannot be separated. DPO uses average trade payables against annual credit purchases, with cost of sales named as an approximation where the purchase figure is unavailable. All three annualise over 365 days. Cash tied up is inventory plus receivables less payables. The worked example and the calculator use the same arithmetic, and the calculator’s assumptions are printed beneath it. The figures in the example are illustrative; the formulas are standard and do not change with the calendar.
Data sources and dates. The late-payment figures come from research by London Economics for the Department for Business and Trade and the Office of the Small Business Commissioner, published 31 July 2025, covering UK businesses of all sizes. The status of the Commercial Payments Bill and the Bank of England base rate of 3.75% were checked on 19 August 2026. We deliberately do not quote a typical UK working capital cycle: the large-sample studies that publish one cover listed and large private companies, and presenting those days as an SME benchmark would be misleading.
Update cadence. We re-check the dated statistics and the legislative status regularly, and the verification date above reflects the most recent review. Some links on this page are affiliate links; see our editorial policy.
Regulatory note. This page is editorial content, not regulated financial advice, and it is not a substitute for your accountant on the treatment of your own figures. The funding products referenced may be unregulated commercial finance for limited companies. Compare offers directly with providers before you apply.