Working capital is the short-term money tied up in your business that keeps it moving day to day. It helps you pay bills, pay yourself, buy stock, finish work for customers, deal with suppliers and keep the business running. If your working capital is weak, even a profitable business can run into cash flow problems.

About this episode

Why Working Capital is Important for Your Business is episode 52 of the I Hate Numbers podcast. This anniversary episode focuses on one of the most practical parts of business finance: having enough short-term funds to keep going.

We explain what working capital is, how to calculate it, why it matters, and what you can do to improve it. We also look at the money tied up in inventory, unpaid customer accounts and cash, alongside short-term debts such as supplier bills and overdrafts.

If you want a wider foundation first, our episode on Understanding Your Financial Statements: Cash Flow, Profit and Balance Sheet is a useful starting point.

Why working capital matters

Working capital matters because it is the fuel in your business. A car may be beautifully built, but without fuel it will not move. Your business works in a similar way.

You may have customers, products, services and profits, but if cash is trapped in unpaid invoices, unfinished work or slow-moving stock, you may not have enough money available when bills arrive.

That is why profit alone does not guarantee survival. A profitable business can still struggle if it cannot turn work, stock and customer accounts into cash quickly enough.

Key points from this episode

What is working capital?

Working capital is the difference between your short-term assets and your short-term debts.

Your short-term assets are things you expect to turn into cash relatively soon. These include inventory, receivables and cash. In older accounting language, these may be called stock, debtors and cash.

Your short-term debts are amounts that need to be paid soon. These include supplier bills, overdrafts and other short-term obligations. In older language, these may be called creditors.

How to calculate working capital

The basic working capital calculation is:

Working capital = current assets minus current liabilities

Current assets include cash, unpaid customer invoices and inventory. Current liabilities include supplier bills, overdrafts and short-term debts.

Ideally, your business should have more current assets than current liabilities. A positive working capital position gives you more room to pay bills, deal with timing gaps and keep the business moving.

Current assets: inventory, receivables and cash

Current assets are the short-term items in your business that should ultimately become cash.

Inventory includes stock, products ready for sale, partly completed goods and work in progress. Service businesses can also have inventory when work has started but has not yet been completed or billed.

Receivables are unpaid customer accounts. If you have invoiced customers and are waiting for payment, that money is tied up until it reaches your bank account.

Cash is the money already available in your bank account or cash tin. It is the most liquid part of working capital because it can be used immediately.

Current liabilities: supplier bills and short-term debt

Current liabilities are short-term debts your business needs to pay. These can include unpaid supplier bills, overdrafts, short-term loans and other amounts due soon.

These debts matter because they create pressure on cash. If suppliers, lenders or HMRC need paying before your customers pay you, your business can feel the squeeze.

Looking at current assets and current liabilities together helps you see whether the business has enough short-term strength to operate safely.

Why inventory can create cash pressure

Inventory can be useful, but it can also trap cash. If too much money is tied up in stock, unfinished products or work in progress, it may not be available to pay bills.

For service businesses, work in progress matters too. If work is partly complete but not yet billed, time and cost may already have been spent without cash coming in.

One way to improve this is to shorten the time between starting work, completing the job, billing the customer and collecting the money.

Receivables and getting paid

Receivables can become one of the biggest working capital pressures. Offering credit can help win customers, but it also means your money sits in unpaid invoices until customers pay.

That creates a cost. You may spend time chasing payment, carry the risk of bad debts, and have less cash available while waiting.

A good credit control policy helps. Set clear terms, check customer creditworthiness, ask for deposits where appropriate, use stage payments, and follow up unpaid invoices promptly.

For more practical steps, our episode on Getting Paid on Time: Practical Steps to Protect Your Cashflow is a useful follow-on.

Tips to improve working capital

Keep an eye on unpaid customer invoices.
Agree clear payment terms before work starts.
Ask for deposits or stage payments where possible.
Reduce the time between doing the work and billing the customer.
Avoid holding too much stock or work in progress.
Review slow-moving inventory.
Use accounting systems to track what is owed and what needs paying.
Maintain good supplier relationships and pay bills on time.
Monitor overdrafts and short-term debts carefully.
Review your working capital regularly, not just at year end.

Good systems make this easier. Our episode on Cloud Accounting: Embracing the Future of Financial Management explains how digital records can help you monitor business performance and stay on top of your numbers.

FAQs about working capital

What is working capital in business?

Working capital is the difference between current assets and current liabilities. It shows how much short-term financial fuel your business has available.

Why is working capital important?

Working capital is important because it helps your business pay bills, suppliers, loans, wages and owners. Without enough working capital, the business can struggle even if it is profitable.

What are examples of current assets?

Common current assets include cash, unpaid customer invoices and inventory. Inventory can include stock, partly completed products or work in progress.

How can I improve working capital?

You can improve working capital by collecting customer payments faster, reducing slow-moving stock, billing promptly, using deposits or stage payments, managing supplier terms and monitoring short-term debts.

Episode Timecodes

00:00 – Introduction to episode 52
00:28 – One year of the I Hate Numbers podcast
00:57 – Why this episode focuses on working capital
01:22 – What working capital is, how to calculate it and why it matters
01:45 – Working capital as the fuel in your business
02:38 – Assets in a service business
03:25 – Short-term assets and cash generation
04:09 – Inventory, receivables and cash
05:17 – Work in progress in service and product businesses
06:08 – Receivables and customer credit
07:07 – Short-term debts and current liabilities
07:53 – Using the seesaw idea to compare assets and debts
08:14 – Calculating current assets
09:32 – Calculating current debts
09:57 – Positive working capital and liquidity
10:20 – Why inventory can be hard to convert into cash
11:25 – Why sufficient working capital keeps the business operating
11:55 – Tips for improving working capital
12:43 – Receivables, credit control and customer payment terms
13:53 – Why profit does not guarantee survival
14:17 – Working capital examples and the operating cycle
14:47 – Final support and wrap-up

Related episodes

Key takeaway

Working capital is the short-term fuel that keeps your business operating. It is tied up in cash, unpaid customer invoices, inventory, work in progress and short-term debts.

A profitable business can still struggle if cash is trapped in the wrong places. Keep your working capital under review, bill promptly, collect money faster, manage stock carefully and use good systems to track what is coming in and going out.

Plan it, Do it, Profit.

“Profit does not guarantee survival if your working capital is poor and your money is tied up in customers and inventory.”

Further Support

The I Hate Numbers podcast helps business owners understand accounting, tax, finance, profit, cash flow, and business planning in a practical way. We simplify financial topics so you can make better decisions and feel more confident with your numbers.

You can also watch more practical finance and tax support on the I Hate Numbers YouTube channel, or listen and follow on Apple Podcasts.

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https://www.ihatenumbers.co.uk/i-hate-numbers-book/

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https://www.ihatenumbers.co.uk/i-hate-numbers-podcast/

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Working Capital Explained: Why It Matters and How to Improve It