Subscribe to our newsletter to receive business tips, learn about new funding programmes, join upcoming events, take e-learning courses, and more.
Take the first step to successfully starting and growing your business.
Join for free)
Posted: Mon 8th Jun 2026
Last updated: Mon 8th Jun 2026
22 min read
Cash flow is one of the clearest signs of how healthy your business is. It shows whether you have enough money coming in at the right time to cover what needs to go out.
That might sound simple, but cash flow is where many small businesses feel the pressure.
You can have strong sales, regular customers and a growing reputation, while still struggling to pay suppliers, wages or tax bills on time.
The problem is often timing. You may be owed money, but it's yet to land in your account.
For small business owners, sole traders and start-ups, cash flow management affects what you can afford, when you can invest, whether you can take on new work and how confidently you can plan ahead.
This guide explains what cash flow is, why it matters, how to create a cash flow forecast and what to do when problems appear. It also points you to more detailed guides, tools and support if you need help with a specific issue.
Cash flow is the money moving into and out of your business over a set period.
Money coming in might include customer payments, sales revenue, grants, loans or investment.
Money going out might include wages, rent, stock, tax, supplier bills, loan repayments, insurance and software subscriptions.
There are three basic terms worth understanding:
Cash inflows: Money entering the business
Cash outflows: Money leaving the business
Net cash flow: The difference between money coming in and money going out
If more money comes in to the business than goes out during a period, you have positive cash flow. If more money leaves than comes in, you have negative cash flow.
Negative cash flow isn't always a disaster. For example, you might spend money upfront on stock before a busy trading period.
But if negative cash flow continues for too long or catches you by surprise, it can make it harder to pay bills and make decisions with confidence.
A simple cash flow projection can help you see what is likely to happen before it becomes urgent.
Cash flow is crucial because it determines whether you're able to keep the business running day to day.
Good cash flow helps you pay suppliers, cover wages, buy stock, invest in marketing, pay tax and deal with unexpected costs. Poor cash flow can make even routine decisions feel difficult.
It's also about more than survival. Cash flow determines whether your business can say yes to opportunities.
If you're a retailer, you may need to buy stock before the busiest season.
If you're a consultant, you may finish a project in May but not get paid until July.
If you run a café, you may face higher energy bills before your takings increase.
Or, generally, a tax bill might fall due before you've received the money from several large invoices.
In each case, the business might be viable, but the timing of payments puts you under pressure.
That's why cash flow management is so important. It helps you understand what's happening now, what's coming next and what you may need to change before the pressure builds.
The Small Business Commissioner's Fair Payment Code links payment behaviour to growth.
It says uncertainty around payment makes planning harder, and every hour spent chasing invoices is time not spent growing the business, hiring staff or improving products and services.
Chloe Guo, founder of Shufu Bubble Tea, advises business owners to question whether a purchase is really needed before spending:
"Do you really need that new piece of equipment or can you use something else, borrow it or buy it second-hand?
"Estimate how much more revenue a spend is going to generate and weigh up if it's worth it, particularly if you're struggling for cash."
Cash flow and profit are linked, but they aren't the same thing.
Profit is what's left after you deduct your costs from your income.
Cash flow is about timing – when money actually arrives and when money leaves.
Here's an example. Say you invoice £10,000 in June and have £6,000 of costs.
On paper, you've made a profit. But if the customer doesn't pay until August and your supplier's bill is due in July, you may still have a cash gap.
This is why profitable businesses can still run into cash flow problems.
If customers pay late, costs rise suddenly or you need to spend money upfront before income arrives, your business can feel short of cash even when the accounts look healthy.
Understanding your numbers helps you see both sides – whether the business is profitable and whether you have enough money available at the right time.
Susana Marambio, co-owner and director at Beacon Business Commercial Services, puts it plainly:
"Don't leave the numbers to your accountant. You need to understand your costs, overhead and profits.
"And you need to understand the difference between profitability and cash flow. Cash flow is what pays your bills!"
Cash flow problems often build gradually. The earlier you understand what's causing them, the easier they are to deal with.
Delayed invoices are one of the most common causes of cash flow stress, especially for service businesses and B2B suppliers.
If you've completed the work but payment takes weeks or months to arrive, you may still need to pay staff, suppliers, rent, tax and other costs in the meantime. Even a reliable customer can cause problems if their payment process is slow or unclear.
Having clear payment terms, accurate invoices and a consistent follow-up process can make a real difference.
Many business owners focus on what's in the bank today. That can be useful, but it doesn't show you what's coming next.
You may have supplier bills, wages, tax payments, rent and loan repayments due soon. Without a forecast, it's easy to assume you have more available cash than you really do.
A cash flow forecast helps you look ahead and spot periods where money may be tight.
Rising rent, staff costs, materials, energy bills and supplier prices can reduce your margins and make previous plans unreliable.
If your costs go up but your prices, sales or payment terms stay the same, you may feel the squeeze quickly.
Regularly reviewing your costs and updating your forecast can help you make decisions earlier.
Product businesses can feel this pressure quickly. Mandy Chowdhary, founder of Goodness Goodies, has described cash flow as "quite tough" because products aren't selling as quickly and customers are buying less.
For businesses that supply independent retailers, slower demand can mean cash is tied up in stock for longer.
Some businesses earn heavily in certain months but have fixed costs all year.
For example, a business might do most of its sales around Christmas, during summer or at the start of the school year.
If income is uneven but costs are steady, you need to plan for the quieter months as well as the busy ones.
If your prices don't reflect your costs, time and margin, you may stay busy but still lack cash.
This is common when business owners undercharge to win work, absorb rising costs or forget to factor in admin, delivery, materials, software, tax and their own time.
Cash can become tied up in stock, equipment, premises, marketing or hiring before your business sees a return.
Some upfront spending is necessary, especially when a business is growing. But if you commit too much cash too soon, you may not have enough left to cover regular costs.
Morgan Arnell, co-founder of Crumbs Brewing, says cash was "the biggest headache" as the business grew.
Having never run a manufacturing-driven business before, the team found that too much working capital could be tied up before steady income arrived.
VAT, Corporation Tax, Self Assessment, PAYE, insurance renewals and yearly subscriptions can all create pressure if you don't plan for them.
These costs are often predictable, but they may not arise every month. That makes them easy to forget until the payment date approaches.
Cash flow problems are easier to manage when you catch them early. Here are some signs that your cash flow needs attention:
You often have to wait for invoices to clear before paying bills.
You're using personal money to cover business costs.
You regularly delay paying suppliers.
You avoid checking your bank balance or accounting software.
You're making sales but still feel short of cash.
You have no clear view of the next three to six months.
You're taking on debt to cover recurring costs, not temporary gaps.
You're surprised by tax bills, VAT payments or annual renewals.
One warning sign doesn't mean your business is in serious trouble. But if you're seeing several of them, it's worth looking closely at your forecast, costs, payment terms and debts.
A cash flow forecast estimates what money will come in and go out over a future period.
For many small businesses, a three-month forecast is a good starting point. It's short enough to feel manageable but long enough to show upcoming bills, late payments and quieter periods.
A six-month forecast can help if you're planning stock, preparing to hire staff or thinking about a large purchase. A 12-month forecast is useful for tax bills, seasonal dips and growth planning.
ICAEW's Business Finance Guide makes the same point – a cash flow forecast should show what your cash position is likely to be over the coming months, and you can create one using a spreadsheet, an app or your online accounting system.
Start with a period that suits your business.
If cash is tight, a weekly forecast for the next 12 weeks may be useful.
If your business is stable, a monthly forecast over six or 12 months may be enough.
You're not aiming to predict everything perfectly. Instead, you're looking to give yourself a clearer view of what's likely to happen.
Add the money you expect to receive during the forecast period. This might include:
customer payments
confirmed sales
recurring revenue
grants, loans or other investment
other income
Be realistic about when the money will actually arrive. If a customer usually pays 30 days late, build that into the forecast rather than assuming payment will arrive on the invoice date.
Next, list the money you expect to pay out. Include:
rent
wages
stock
software
tax
loan repayments
insurance
marketing
utilities
supplier bills
any other regular or one-off costs
Don't forget yearly or irregular costs. These are often the payments that catch businesses out.
Timing is the crucial part of a cash flow forecast.
A sale made in June doesn't help your cash position in June if the money arrives in August.
You must still pay a supplier bill due in July even if several customers are yet to pay you for the work you've done.
Show when you expect money to move, not just when you made a sale or agreed a cost.
A forecast becomes more useful when you update it regularly. Compare what you expected with what actually happened.
Did customers pay later than expected?
Were costs higher than planned?
Did a quieter month affect your position more than you thought?
For many businesses, a monthly review is enough. If cash is tight, update the forecast every week.
Your forecast should help you make decisions earlier. You might:
delay a non-essential purchase
chase invoices sooner
negotiate supplier terms
reduce costs
adjust pricing
arrange funding before the gap becomes urgent
A cash flow forecast gives you a better chance of responding before pressure builds.
Improving cash flow is often about making several small changes rather than finding one big fix.
Invoice as soon as work is complete, or at agreed milestones if the project runs over a longer period.
Delaying an invoice delays the point at which you can be paid. Make invoicing part of your normal process, not something you do when you have spare time.
Your invoices should clearly state:
the date the payment is due
the payment methods you accept
the purchase order details
any agreed terms
It also helps to explain what happens if the customer pays late. Customers are more likely to pay on time when expectations are clear from the start.
Chasing payment can feel uncomfortable, but it's a normal part of running a business.
Make sure you're both polite and consistent. Send a reminder before the due date, follow up on the due date and escalate if the invoice becomes overdue.
Deposits and staged payments can help when you have upfront costs or long projects.
They're especially useful for project-based businesses, custom orders and work that requires materials, planning or subcontractors before the final payment is due.
If your costs have increased but your prices have stayed the same, your business may be absorbing too much pressure.
Review your prices regularly. Make sure they reflect your costs, time, value, margin and the level of service you provide.
Pricing mistakes can affect cash flow quickly. Lucy Harper, founder of A Taste of Heaven, says not getting her pricing right at the beginning had a major impact on her profit margin.
Her lesson was to ask for help early rather than lose time and money figuring everything out alone.
Review subscriptions, suppliers, stock, insurance, software and utilities.
Look for costs that are no longer useful, contracts you can renegotiate or spending you can delay without damaging the business.
Where possible, try to time your supplier payments so they coincide with when you receive payment from customers.
For example, if customers pay you after 30 days but suppliers expect payment within seven days, you may have a regular cash gap. Better terms can give you more breathing space.
A cash reserve isn't a magic solution, but it can reduce stress.
Even a small reserve can help you deal with a late payment, an unexpected bill or a quieter month without immediately needing to borrow.
Accounting software can help you track invoices, expenses, tax and reports. It can also give you a clearer picture of your cash position, especially when linked to your bank account.
Our accounting software guide explains how software can support with invoicing, preparing taxes, financial reports and tracking cash flow.
Late payment remains a major issue for the UK's small businesses.
In its 2026 response to the late payment consultation, the UK government said businesses are owed an estimated £26 billion in late payments at any given time, with affected businesses spending an average of 86 hours a year chasing overdue invoices.
You should treat late payments as an issue with your business processes, not just an awkward conversation.
The clearer your process is, the easier it is to prevent delays and follow up when they happen.
Here are some useful steps on dealing with late payments:
Check the customer's legal business name before invoicing.
Agree payment terms in writing before work starts.
Ask how the customer's payment process works.
Send accurate invoices with all the necessary details.
Follow up before and on the due date.
Keep written records of conversations.
Escalate when necessary.
If you often receive payments late, review your customer onboarding, contracts, invoicing and follow-up process.
You may also want to consider asking customers for deposits, setting staged payments or agreeing shorter payment terms.
You don't need to be aggressive, but you do need to be consistent.
When costs rise, cash flow becomes harder to predict.
You may need to review prices, renegotiate contracts with suppliers, reduce waste, plan stock more carefully or update your forecast more often.
Fixed costs are regular costs that usually stay the same, such as rent, insurance, software and some staffing costs.
Variable costs change with sales or activity, such as stock, materials, packaging, delivery and some freelance support.
Knowing the difference helps you understand where pressure is coming from.
Look at suppliers, software, stock levels, energy use, subscriptions, premises and logistics.
Some costs may be essential. Others you might be able to lower, pause or renegotiate. The aim is make sure your spending supports the business.
Cutting costs is only part of the answer.
If wages, rent, energy bills or suppliers' prices have increased, you may need to raise your own prices, adjust the packages you offer or change what you include in your service.
Reviewing margins helps you understand whether each sale is still working financially.
Use your cash flow forecast to model a few possible outcomes.
A simple approach is to create a best case, expected case and difficult case. This can help you see how the business would cope if sales slowed, costs rose again or customers took longer to pay.
Tax bills can put pressure on cash flow because they're often irregular, predictable and easy to underestimate.
It's easy to look at money in the bank and assume it's there for you to spend. But some of that money may need to cover VAT, Corporation Tax, Self Assessment, PAYE, National Insurance or business rates.
Here are some useful habits to adopt:
Set aside a percentage of income for tax.
Know which taxes apply to your business.
Add expected tax payments to your cash flow forecast.
If you're VAT-registered, plan for VAT payment dates.
If you're self-employed, plan for Self Assessment payments on account.
Keep records up to date rather than waiting until year end.
Speak to an accountant if there's anything you're unsure about.
Tax rules can change, so check HMRC's guidance or speak to an accountant before making decisions.
Accounting software can also help you keep records organised and understand what may be due.
Funding can help with temporary cash flow gaps, growth opportunities, stock purchases, equipment, seasonal demand or late customer payments.
But you should use it carefully. Borrowing can help with timing, but it's best not to use it to prop up a business model that isn't working
Start by understanding the reason for the gap.
Is it temporary or recurring?
Is it caused by late payments, low margins, weak forecasting, rising costs or a planned investment?
The answer matters. A short-term funding option might help with a temporary gap, but cash shortages occurring repeatedly may point to a deeper issue that needs attention.
Common funding options include the following:
Overdrafts: Flexible borrowing linked to your business bank account
Short-term loans: Borrowing you pay back over a set period
Lines of credit: Access to funds when you need them, usually up to an agreed limit
Invoice finance: Funding based on unpaid invoices
Merchant cash advances: Funding repaid through a percentage of card sales
Asset finance: Funding to buy equipment, vehicles or machinery
Grants: Funding that usually doesn't need to be paid back, if you meet the criteria
Equity funding: Investment in exchange for a share of the business, where relevant
Each option has different costs, risks and repayment terms, so compare them carefully.
The British Business Bank's 2025 Small Business Finance Markets report found that fewer smaller businesses were using outside finance, although the value of finance edged up in 2024.
It also highlighted that high credit costs and aversion to risk are among the factors preventing smaller business from seeking investment.
Before taking on funding, ask yourself these questions:
What will I use the money for?
How much will it cost?
When will repayments start?
Can the business afford repayments if sales are slower than expected?
Is the funding solving a temporary timing issue or covering a deeper problem?
Don't rush into borrowing because cash feels tight today. Use your forecast to understand what you need, when you need it and how you'll pay it back.
You don't need to wait until cash flow problems become serious before asking for help.
An accountant, bookkeeper, financial adviser or business mentor can help you understand your numbers, improve your processes and make better decisions.
It may be time to speak to an adviser if:
you can't explain why cash is tight
you're regularly missing payments
you're not sure whether to borrow
you have tax bills due and no plan for paying them
you're growing but cash is getting tighter
you're taking on larger contracts with longer payment terms
you need help building or reviewing a forecast
Enterprise Nation's adviser directory allows you to browse advisers by category, including bookkeeping and accounting, tax and VAT, budgeting, grants and loans, cash flow and financial planning.
The Office of the Small Business Commissioner advises businesses affected by late payment to seek practical financial support, whether it's from an accountant, a bank, a financial adviser or a relevant trade body.
Use this checklist to review the basics of your cash flow management:
Understand what money is coming in and going out.
Separate profit from cash flow.
Build a three-month or 12-month cash flow forecast.
Review the forecast regularly.
Invoice promptly.
Make payment terms clear.
Chase overdue invoices early.
Review costs and pricing.
Plan for tax bills.
Keep a cash reserve where possible.
Consider funding only when you understand the cause of the gap.
Speak to an adviser if cash flow problems keep returning.
Cash flow management works best as a regular habit rather than a one-off.
A simple review every month can help you spot problems, plan for bills and make decisions earlier. If cash is tight, review your forecast weekly until things feel more stable.
Start with the area that feels most urgent. The aim is to give yourself enough visibility to make calmer, better decisions for your business.
Cash flow projection guide: Learn how to build a simple forecast.
Accounting software guide: Compare tools that can help with invoicing, reporting and tax.
Funding Hub: Explore finance options if you need to cover a temporary gap.
Adviser directory: Find expert support if you need help understanding or improving your cash flow.
Need to cover a temporary cash flow gap or plan for growth? Explore funding options through Enterprise Nation's Funding Hub.
