Working Capital: What It Is and How to Manage It Effectively

Working capital is the difference between a business's current assets and current liabilities. It helps show whether the business has enough short-term resources to cover bills as they fall due. A profitable business can still face a cash squeeze if it pays for stock and staff before customers pay their invoices.

In this guide, we've explained how to calculate working capital, why it matters, how much you need and how you can deploy and grow it. We've also touched on how Wise Business can help a business manage their working capital, especially when deploying it across borders.

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Note: Wise Business offers a free Essential plan for basic spending and transferring. If you need to receive money, set up direct debits, or generate invoices, you'll pay a one-time £50 setup fee to unlock the Advanced features.

Wise services and features are not available in all regions, country and product restrictions apply. Visit wise.com to check availability, and for fee details and terms for your region, visit our pricing page for Wise Business.

This content is provided for general educational and informational purposes only. It is not intended to provide legal, tax, financial, investment or professional advice and should not be relied upon as such.

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Key takeaways

What is working capital?

Working capital is the difference between current assets and current liabilities. Current assets include cash, stock and trade receivables, which are customer invoices the business expects to collect. Current liabilities include amounts due to suppliers, wages, tax and short-term borrowing.

The basic formula is:

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Working capital = current assets − current liabilities

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E.g. If current assets are £180,000 and current liabilities are £140,000, working capital is £40,000. That doesn't mean the business has £40,000 ready to spend. In this example, £90,000 of its assets could be stock and £55,000 could be unpaid customer invoices. The business must sell the stock and collect the invoices before it can use that money to pay bills.

A negative figure is not automatically a problem. A retailer may collect customer payments at checkout and pay suppliers later. The arrangement becomes harder to sustain if sales slow, suppliers shorten their terms or bills fall due before cash arrives.

How do you calculate working capital and related ratios?

Start with the latest reconciled balance sheet. Add up current assets, add up current liabilities and subtract the second total from the first. Leave long-term assets, such as property, out of this basic calculation.

The £180,000 and £140,000 example gives £40,000 of working capital. Two related measures help explain whether that balance is useful in practice.

Current ratio

Current ratio = current assets ÷ current liabilities

In the example, £180,000 ÷ £140,000 = 1.29 after rounding. The business has £1.29 of current assets for each £1 of current liabilities. Check what those assets comprise before treating a high ratio as good news: slow-moving stock and overdue invoices may not turn into cash when the business needs it.

Cash conversion cycle

The cash conversion cycle estimates how long the business must fund operations between paying suppliers and collecting money from sales. Calculate it by adding inventory days and receivables days, then subtracting payables days.

For example, if stock is held for 60 days, customers pay 30 days after sale and suppliers are paid after 45 days, the cycle is 60 + 30 − 45 = 45 days. The business needs enough cash or agreed funding to cover that gap. Use consistent periods and, where sales are seasonal, compare rolling averages rather than relying on a single month's figure.

Why is working capital important?

A business can report a profit and still be unable to pay a bill on its due date. Growth can widen the gap because the business may need to buy more stock and pay staff before collecting the extra sales. If too much money is tied up in stock and unpaid invoices, it may struggle to pay bills even as revenue rises.

For a UK business, the timing matters as much as the balance-sheet total. Put expected customer receipts beside payroll, PAYE and National Insurance, VAT, rent, loan repayments and supplier payment dates. A monthly profit report won't show whether a large bill falls due a week before a customer pays.

Working capital also affects day-to-day relationships. Paying suppliers on the agreed date helps keep stock and services moving. Sending accurate invoices and resolving customer disputes promptly makes collection more predictable.

How much working capital does a business need?

There is no single amount or current ratio that suits every business. Start with the operating cycle: when does the business buy stock or provide a service, when does it pay suppliers and staff, and when do customers pay? Then forecast the cash balance week by week, including tax, overheads and planned investment.

Test the forecast against three practical cases:

• Base case: sales, stock turnover and customer payments follow the expected pattern.
• Stress case: customers pay 15 days later, stock takes longer to sell or a supplier asks to be paid sooner.
• Growth case: sales increase, but the business pays for stock, staff or marketing before receiving the extra revenue.

The lowest forecast cash balance shows when extra headroom may be needed. Recheck the forecast when a major customer, supplier, currency or tax assumption changes. The working-capital figure provides a snapshot; the forecast shows whether money will be there on the day a payment is due.

How can you manage working capital better?

Once the forecast shows where cash is tied up, work through the parts of the cycle you can change without disrupting sales or supplier relationships.

Collect customer invoices sooner

Set clear payment terms before accepting an order and send an accurate invoice promptly. Include the purchase order reference if the customer requires one. Review overdue invoices each week, resolve disputes and follow up before a late payment becomes a larger debt. For UK VAT invoices, check the details and treatment with your accountant so an avoidable query doesn't delay collection.

Use supplier terms deliberately

Agree terms before changing payment dates and honour them. Ask whether an early-payment discount is worth using, but don't pay substantially ahead of the agreed date if that leaves the business short of cash for other bills. A longer payable period only helps sustainably when the supplier has agreed to it.

Keep stock in line with demand

Use demand, lead times and a sensible safety-stock level to set reorder points. Identify slow-moving or obsolete lines before buying more. For imported goods, include freight, duty, insurance and currency conversion in the cost of a purchase, then check when the supplier will actually need to be paid.

Compare the forecast with actual payments

Reconcile accounts and payment records, then compare actual customer receipts and supplier payments with the weekly forecast. Separate committed spending from optional spending. This helps the team spot a late receipt or an earlier-than-expected payment while there is still time to respond.

If an approved supplier invoice is in another currency, Wise Business can support the international payment. Your team can review the quoted exchange rate, fee and recipient amount before sending, then keep the transfer record with the invoice for its accounting checks. The payment still needs to be included in your own forecast and approval process.

Manage international working capital with Wise Business

When you need to deploy that working capital for overseas payments, you can use Wise Business to pay international contractors or suppliers for stock or services. You can make these payments to 140+ countries and hold money in 40+ currencies before sending, where supported.

When a currency conversion is needed, your funds are converted into the currency you want to pay in at the mid-market rate with low, transparent fees - and the payment is recorded in your Wise Business account. This makes it easier to enter the expected payment in your forecast and match the completed transfer to the invoice.

You can also connect supported accounting software to bring transaction data into your books, so your finance team can match payments to invoices and update its cash forecast.

And if you want to make your working capital go further, you can do so with Wise Interest. Available for eligible GBP, EUR and USD balances, Wise Interest is an investment feature offered through Wise Assets: your money is invested in an interest-earning fund, with the possibility of a variable return while you continue to send and spend (Capital at risk, growth not guaranteed. Your balance will go down in the event of a government default or interest rates going negative. Taxes may apply. Investments are offered by Wise Assets UK Ltd. FRN 839689).

Wise Business offers a free Essential plan for basic spending and transferring. If you need to receive money, set up direct debits, or generate invoices, you'll pay a one-time £50 setup fee to unlock the Advanced features.

With Wise Business, you can:

• 🌍 Send money to 70+ countries and pay overseas invoices at the mid-market exchange rate with low, transparent fees and no hidden exchange rate markups (product availability varies by region)
• 📥 Receive payments in 24 currencies and counting
• 💵 Get local account details for 8+ currencies, including USD and EUR, to let your customers pay in a currency they know and trust - convenience for them and peace of mind for you
• 💰 Hold money in 40+ currencies
• 🔁 Convert currencies anytime at the mid-market exchange rate with low, transparent fees
• ⚡ Use the batch payments tool to create and send up to 1,000 payments in a single transfer
• 👥 Run payroll and make international payments for up to 1,000 employees all over the world - including paying suppliers using local payment methods like ACH, SEPA, and Faster Payments
• 💳 Get business debit cards with 0.5% cashback for you and your team to keep track of team expenses and spend all over the world, with real-time visibility and categorisation. See full cashback terms and conditions
• 🏢 Manage cash in 55+ currencies across international offices from a single business account and move money between business accounts in seconds (exact speeds can vary depending on individual circumstances and may not be the same for all transactions)
• 🧾 Connect and sync every business transaction to your favourite accounting software, including Xero, Quickbooks, and more
• 🔐 Create your own payment approvals process to manage your team better with customised access for different team members, roles and permissions
• 📑 Create custom professional invoices and schedule invoice payments for future dates
• 📈 Earn variable returns on GBP, USD and EUR with Wise Interest (Growth not guaranteed. Your balance will go down in the event of a government default or interest rates going negative.)
• 🔗 Create payment links and QR codes to get paid easily (Card payment acceptance for new Wise Business customers is currently unavailable. Payment methods subject to eligibility and availability.)
• ⚙️ Automate payouts with the Wise API (comes with 24/7 customer support, a sandbox account to test integrations, API tokens, and clear documents on how to implement and make the most of our API)

Make the wise choice when selecting a business account for your domestic and global needs.

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Wise Interest disclaimer: Growth not guaranteed. Your balance will go down in the event of a government default or interest rates going negative. Taxes may apply. 3.32% variable rate on GBP is based on 7 day performance as of 05 Aug 2026. For full 5-year past performance and fund information, visit https://wise.com/interest. Investments are offered by Wise Assets UK Ltd. (FRN 839689)

Wise services and features are not available in all regions, country and product restrictions apply. Visit wise.com to check availability, and for fee details and terms for your region, visit our pricing page for Wise Business.

FAQs

Is negative working capital always bad?

No. Some businesses collect customer payments before they pay suppliers. The risk is that a fall in sales or a change in supplier terms leaves them unable to pay bills when due.

What is a good working-capital ratio?

There is no universal target. Compare the ratio with the business's operating cycle, sector, seasonality and cash forecast. Check whether stock and receivables are likely to turn into cash when needed.

What is the difference between working capital and cash flow?

Working capital is a balance-sheet measure at one point in time. Cash flow records money moving in and out over a period, and a forecast shows when future receipts and payments are expected.

Can a profitable business run out of working capital?

Yes. The business may buy stock and pay staff before customers pay for the resulting sales. That can create a short-term cash shortage even while the accounts show a profit.