Cash flow problems are the single biggest reason small businesses fail in the UK. A company can be profitable on paper and still run out of money if its cash inflows and outflows are not properly timed. According to Xero’s research, late payments alone cost UK small businesses an estimated £684 million a year in extra costs.
The fix is not complicated, but it does require attention. Here is how to get your cash flow management right.
What cash flow actually means
Cash flow is the movement of money in and out of your business over a period. It is different from profit because profit includes non-cash items like depreciation and accrued revenue.
A simple way to think about it:
| Measure | What it tells you |
|---|---|
| Profit | Whether your revenue exceeds your costs over time |
| Cash flow | Whether you have enough money available right now to pay your bills |
You can be profitable but cash-poor if your customers pay you in 60 days but your suppliers demand payment in 30. Understanding how accounting works helps you see the difference between these two measures.
Build a cash flow forecast
A cash flow forecast is a spreadsheet or tool that projects your expected inflows and outflows over the coming weeks or months. It does not need to be perfect – the goal is to spot potential shortfalls before they happen.
What to include
Cash inflows:
- Customer payments (not invoices – actual expected payment dates)
- Tax refunds (VAT refunds, R&D credits)
- Loan drawdowns or investment
- Interest income
- Any other recurring income
Cash outflows:
- Rent and utilities
- Salaries and pension contributions
- PAYE and National Insurance payments to HMRC
- VAT payments
- Corporation Tax instalments
- Supplier payments
- Loan repayments
- Equipment purchases
- Insurance premiums
How far ahead to forecast
For most small businesses, a 13-week rolling forecast strikes the right balance between accuracy and usefulness. Update it weekly with actual figures and adjust your projections.
If you are planning a larger investment or seasonal shift, extend the forecast to 6 or 12 months so you can see the longer-term impact.
Speed up your receivables
The fastest way to improve cash flow is to get paid sooner. Here are specific tactics that work:
Set clear payment terms from the start
State your payment terms on every invoice and in your contracts. The most common terms in the UK are:
| Term | Meaning |
|---|---|
| Due on receipt | Payment expected immediately |
| Net 14 | Payment due within 14 days |
| Net 30 | Payment due within 30 days |
| Net 60 | Payment due within 60 days |
Shorter terms are better for your cash flow, but you need to balance this against what your customers will accept. If you are currently on Net 60, try negotiating down to Net 30 with new customers.
Invoice promptly
Send invoices as soon as the work is done or the goods are delivered. Every day you delay issuing an invoice is a day added to your payment cycle.
If your accounting software supports automatic invoicing, use it. Set up templates so invoices go out the same day you complete a job.
Offer early payment incentives
A small discount for early payment can be surprisingly effective. A common approach is 2/10 Net 30, meaning the customer gets a 2% discount if they pay within 10 days instead of the usual 30.
Run the numbers first. A 2% discount on a £10,000 invoice costs you £200, but getting the cash 20 days earlier might save you more than that in overdraft interest or lost opportunities.
Chase overdue invoices systematically
Set up a credit control process with automatic reminders:
- Day 1 – send the invoice
- Day 21 (if Net 30) – friendly reminder that payment is due in 9 days
- Day 31 – first overdue notice
- Day 45 – second notice with a phone call
- Day 60 – formal demand letter
Do not let overdue invoices drift. The longer a debt goes unpaid, the less likely you are to collect it. After 90 days, recovery rates drop significantly.
Slow down your payables (without damaging relationships)
While you want to collect quickly, you also want to hold onto your cash as long as reasonably possible before paying it out.
Use your full payment terms
If a supplier gives you 30 days, take 30 days. Paying early does not usually earn you any benefit unless a discount is offered. Schedule payments to go out on the due date, not before.
Negotiate better terms with suppliers
If you are a reliable customer with a good payment history, ask for extended payment terms. Moving from Net 30 to Net 45 gives you an extra two weeks of cash in the bank.
You can also negotiate:
- Staged payments for large orders
- Monthly billing instead of per-delivery invoicing
- Consignment arrangements where you only pay for stock after you sell it
Time your big purchases
If you have a choice about when to make a major purchase, time it to fall after your peak cash inflow period rather than before. Look at your forecast and pick the month where the impact on your cash position is smallest.
Manage your VAT cash flow
VAT can create significant cash flow swings, especially if you are on standard VAT accounting. You collect VAT from customers and hold it until your quarterly return is due, but you also pay VAT on your purchases.
| VAT scheme | Cash flow impact |
|---|---|
| Standard accounting | You owe VAT when you invoice, even if the customer has not paid |
| Cash accounting | You owe VAT only when you receive payment |
| Flat rate | Simpler calculation, but less flexibility |
If your customers are slow to pay, the Cash Accounting Scheme prevents you from paying VAT on money you have not received yet. You can use this scheme if your VAT-taxable turnover is £1.35 million or less.
Read more about how VAT works in the UK.
Build a cash buffer
Aim to keep at least three months of fixed costs in a readily accessible account. This buffer protects you from unexpected expenses, late-paying customers and seasonal dips.
If three months feels out of reach right now, start with one month and build up over time. Even a small buffer dramatically reduces the stress of cash management.
Where to hold your buffer
- A business savings account that pays interest but allows instant access
- Not in a fixed-term deposit where you cannot reach it quickly
- Separate from your main current account so you are not tempted to spend it
Use financing wisely
Sometimes you need external funding to bridge a cash gap. The main options for UK small businesses are:
| Option | Best for | Typical cost |
|---|---|---|
| Business overdraft | Short-term, unpredictable gaps | 5-15% EAR |
| Invoice factoring | Releasing cash tied up in unpaid invoices | 1-5% of invoice value |
| Business credit card | Small, regular expenses | 0% for 6-12 months, then 20%+ |
| Bounce Back Loan | No longer available (COVID scheme) | N/A |
| Asset finance | Spreading the cost of equipment | 5-10% APR |
Invoice factoring deserves a special mention. If your cash flow problem is mainly caused by slow-paying customers, factoring lets you receive 80-90% of the invoice value within 24 hours. The factoring company then collects from your customer.
Watch for warning signs
These signals suggest your cash flow needs attention:
- You regularly dip into your overdraft in the same week each month
- Your debtor days (average time to collect payment) are increasing
- You are paying suppliers late to cover other costs
- You cannot take on new work because you need to wait for payment on existing work
- You are using credit cards to cover routine business expenses
If you spot these patterns, act early. Adjusting your payment terms, tightening credit control or arranging a facility before you need it is always cheaper than dealing with a crisis.
Track it properly
Good cash flow management relies on accurate, up-to-date financial data. If you are reconciling your bank account once a month or tracking invoices in a spreadsheet, you are always looking at old information.
Modern accounting software with live bank feeds and automatic reconciliation gives you a real-time view of your cash position. That makes it much easier to spot problems early and forecast accurately.
Related articles
Cash planning also links closely to Payment terms and credit policy, Bank charges and interest in bookkeeping and Customer refunds in bookkeeping.
More relevant accounting guides
These are useful next steps:
- Partial payments from customers
- Card payment clearing in the chart of accounts
- Work in progress for service businesses
- Loan interest and repayment plans
- Old customer credit balances
More guides on control and structure
These guides extend the routine with stronger controls, cleaner master data and clearer handovers: