Cash flow is the money that actually moves in and out of your bank account, and it can look very different from the profit in your accounts. Much of the gap usually comes from waiting to be paid. That makes the receivables side, from when you invoice to what happens after the due date, the part of cash flow most businesses can do the most about.
In this article
The short version
- Cash flow is money moving through your bank account; profit can look healthy while cash runs short.
- Most of the gap comes from waiting to be paid, so receivables are where most businesses can act.
- Large UK businesses took a median of 32 days to pay suppliers in 2025, and 14% of trading UK businesses reported no cash reserves.
- Overdrafts to smaller businesses are at a record low, and invoice finance costs money on every invoice.
- Invoice promptly, agree how you'll be paid up front, make paying easy and chase on a schedule.
Cash flow, profit and working capital
Your profit and loss account tells you whether the work was worth doing. Your bank balance tells you whether you can pay for it this week. The two drift apart because an invoice counts as income on the day you raise it and as cash only on the day it clears, so a business can be profitable on paper and still struggle to pay a supplier on Friday.
Working capital is the buffer that covers that gap. The British Business Bank defines it as current assets minus current liabilities: the cash, stock and unpaid invoices you hold, less what you owe in the short term. Some accountants use a narrower version that leaves cash out and looks only at stock, customer debts and supplier debts. If you're comparing your figure with someone else's, check you've both used the same one, because the difference is your whole bank balance.
For day-to-day planning, cash means money you can actually spend: your current account and anything you can reach immediately. A balance in a 90-day notice account won't help with Thursday's payment run.
The cycle itself is simple. You pay staff and suppliers, you do the work, you invoice, and at some point later your customer pays. The longer that loop runs, the more working capital you need to keep going, and collecting from customers sooner is one of the first ways the British Business Bank suggests shortening it.
Where the cash gets stuck
Two parts of that cycle are largely in your hands: what you pay out and how long the work takes. The third, how long the money takes to come back, depends on someone else's accounts team. That's why receivables get most of the attention.
A few UK figures give a sense of scale:
- Large UK businesses took a median of 32 days to pay their suppliers in 2025, and 15% of their invoices were paid late, according to the government's payment practices statistics. Each large business's report is public, so you can look up a big customer on the Check Payment Practices service before you agree terms.
- Government research estimates that around £26 billion is owed to UK businesses in late payments at any one time, an average of about £17,000 for each business affected.
- In late December 2025, 14% of trading UK businesses told the ONS they had no cash reserves at all.
For a business with no buffer, one large invoice arriving three weeks late lands on a bank balance with nothing behind it.
There's no official UK figure for small-business debtor days, so the most useful comparison is usually your own: the same calculation, done the same way, every month. Within your own ledger, it's common to find that a short list of customers accounts for most of the late money, and an aged debtor report sorted by customer will show you who they are.
Cash flow forecasts and funding the gap
A cash flow forecast puts dates on all of this. Many small businesses keep a rolling 13-week forecast of money in and out, updated weekly, with a rougher 12-month view behind it. The 13 weeks is a working habit, not a rule. The one horizon UK guidance does set is for going concern, where the Financial Reporting Council asks directors to look at least 12 months ahead.
The receipts line is the hardest one to get right, because your customers decide when it lands. You'll get a more realistic picture if you forecast each open invoice from how that customer has paid before, not from its due date. Direct debit is the exception: you set the collection date, so those receipts can go in on the day you expect them.
When a forecast shows a gap, the traditional answer was the overdraft, and that option has shrunk. The British Business Bank reports that the stock of bank overdrafts to smaller businesses stood at £7 billion at December 2025, the lowest on record and 54% lower than in 2012.
Invoice finance is the other common route. A provider advances most of an invoice's value straight away, and you pay a service fee plus a charge similar to interest on the money advanced. With factoring, the provider usually collects from your customers directly, so they'll know about it. Invoice finance helps with timing, but it costs money on every invoice and does nothing about a customer who simply doesn't pay. If you're weighing it up, compare the total cost across a year, not just the headline rate.
With either one, you're paying to bridge a gap that starts with when your customers pay, so it's worth looking at what you can do about the gap itself first.
What you can change on the receivables side
Some of what slows your cash down is within your control, and some of it you can only plan around.
| You can usually change | You can't change, but can plan around |
|---|---|
| When the invoice goes out, and whether it reaches the person who approves it | The day your customer's payment run falls on, though you can ask |
| How customers can pay, and whether paying takes a few taps or a bank login | A large customer's standard payment terms |
| Whether terms were agreed in writing before the work started | Bank Rate, and what borrowing costs you |
| Whether you take a deposit, a retainer or instalments | Your customer's own cash position |
| Your chasing schedule, and whether it runs when you're busy | Who else is chasing the same customer |
The changes that tend to shorten the wait are mostly small. Invoice on the day the work is done, with a due date written as a date. Agree how you'll be paid before you start, whether that's a direct debit mandate for regular work or a deposit for a one-off job. Give customers a payment link they can use straight away, by card, Apple Pay, Google Pay or pay by bank. Chase on a schedule rather than when you remember. And on late business invoices, use your statutory right to interest at 8% above the Bank of England base rate, which is 11.75% a year with the base rate at 3.75%, plus fixed compensation of £40 to £100 per invoice.
If you'd rather not run all of that by hand, Adfin handles the getting-paid side in one place. You send invoices with a payment link, customers pay by card, Apple Pay, Google Pay, pay by bank, bank transfer or direct debit, and each payment is matched to its invoice and synced back to Xero or QuickBooks. Adfin's AI Customer Agents can chase each customer over email, SMS or WhatsApp, offer instalment plans and add statutory interest to overdue business invoices, all within rules you set and review.
Adfin doesn't lend money or buy your invoices. Its job is the time between sending an invoice and being paid.
Common questions
What's the difference between cash flow and profit? Profit measures whether your work was worth doing over a period, while cash flow is what actually moved through your bank account and when. An invoice counts as income when you raise it and as cash when it clears.
What is working capital? The British Business Bank defines it as current assets minus current liabilities, which includes your cash. It's the buffer that pays your costs while you wait for customers to pay you.
Does Adfin offer invoice finance? No. Adfin doesn't lend money or buy invoices. It handles the work between sending an invoice and being paid: collecting payment, chasing and reconciliation.
How long do large UK businesses take to pay their suppliers? A median of 32 days in 2025, with 15% of invoices paid late, according to government statistics. You can look up an individual large business on the Check Payment Practices service.
How far ahead should a cash flow forecast look? Many small businesses use a rolling 13-week forecast with a 12-month outline behind it. For a going concern assessment, the FRC asks directors to look at least 12 months ahead.
Is invoice finance worth it for cash flow? It turns unpaid invoices into cash now, at a cost on every invoice, so it can help with timing. It won't help with a customer who doesn't pay, so compare the full annual cost before you sign up.
Sources
- British Business Bank - Why working capital is important to your business (accurate as of October 2026) https://www.british-business-bank.co.uk/business-guidance/guidance-articles/finance/why-working-capital-is-important-to-your-business
- British Business Bank - Small Business Finance Markets 2025/26 (accurate as of October 2026) https://www.british-business-bank.co.uk/sites/g/files/sovrnj166/files/2026-03/report-small-business-finance-markets-2026.pdf
- GOV.UK - Large businesses' payment practices and performance statistics 2025: commentary (accurate as of October 2026) https://www.gov.uk/government/statistics/large-businesses-payment-practices-and-performance-statistics-2025/large-businesses-payment-practices-and-performance-statistics-2025-commentary
- Department for Business and Trade - Late payments research: impact on the UK economy (accurate as of October 2026) https://assets.publishing.service.gov.uk/media/688a089a6478525675738ff9/late_payments_research_impact_on_uk_economy.pdf
- Office for National Statistics - Business insights and impact on the UK economy, 8 January 2026 (accurate as of October 2026) https://www.ons.gov.uk/businessindustryandtrade/business/businessservices/bulletins/businessinsightsandimpactontheukeconomy/8january2026
- GOV.UK - Late commercial payments: charging interest and debt recovery (accurate as of October 2026) https://www.gov.uk/late-commercial-payments-interest-debt-recovery/charging-interest-commercial-debt
