1. Cash flow first:
Why profitable businesses still struggle
I’ve seen plenty of profitable businesses hit cash flow trouble. It usually isn’t because they are doing something “wrong” in a dramatic way. It’s because money moves on a different timeline to sales, and the gaps add up.
This guide covers the most common cash flow mistakes business owners make, and the practical fixes that prevent the same problems repeating every quarter.
1.1 Profit, cash, and timing (the simple version)
Profit is an accounting result. Cash is what is available to pay wages, VAT, suppliers, and you.
Cash flow problems often show up when:
- You pay suppliers faster than customers pay you
- You take on larger work that needs upfront costs
- VAT and tax bills land before the cash has arrived
1.2 The warning signs you should not ignore
If any of these are true, treat them as early warnings, not background noise:
- You check the bank balance daily, repeatedly
- You delay paying suppliers to buy time
- You avoid opening HMRC letters or emails
- You feel busy and successful, but always short of cash
2. Mistake #1:
Relying on the bank balance as your ‘system’
The bank balance tells you where you are. It does not tell you what is about to happen.
This is one of the most common small business cash flow mistakes because it feels sensible. In reality, it creates surprises.
2.1 A better dashboard to check weekly
You do not need complex reporting. You do need a few numbers that are consistent:
- Cash in bank today, by account
- Invoices due in the next 7 days
- Bills due in the next 7 days
- VAT and payroll amounts, with dates
2.2 Quick fix: set a 15-minute money rhythm
Pick a day each week and repeat the same quick routine:
- Update invoices and bills to “real” dates
- Check the next 4 weeks for cash gaps
- Send chasers for anything overdue
3. Mistake #2:
Treating VAT money like business money
VAT is one of the biggest causes of common cash flow problems. The business collects it, holds it, then pays it over.
If that VAT sits in the trading account, it gets spent by accident. Then the due date arrives and it feels like an unexpected bill.
3.1 How VAT creates a hidden cash gap
Even when sales are strong, VAT can tighten cash because:
- VAT is owed on invoices issued, not cash received, on the standard method
- Large one-off purchases can distort quarters
- Seasonal trading can leave a low-cash quarter at the wrong time
3.2 Quick fix: ring-fence VAT and plan the due dates
Simple steps that work:
- Move a VAT percentage weekly into a separate account
- Keep a list of VAT deadlines for the next 12 months
- Review whether Cash Accounting is suitable for your business
4. Mistake #3:
Not having a rolling cash flow forecast
A cash flow forecast is not a spreadsheet you update once and forget. It is a rolling view of what cash will do next.
If you only look backwards, you spot issues when they have already hurt.
4.1 What a useful forecast actually looks like
A practical forecast is built around real timing:
- Expected customer payments by week, not by month
- Known outgoings on their actual payment dates
- One line for “unknown but likely” costs, kept realistic
4.2 Quick fix: start with 13 weeks
A 13-week cash flow forecast is often enough to prevent most surprises.
Start by listing:
- All current invoices and their expected paid dates
- Payroll dates, VAT dates, rent dates, and loan dates
- Supplier bills you already know are coming
5. Mistake #4:
Letting customers set your payment terms
When customers pay late, the business becomes their bank. That is a costly role to accept by default.
5.1 The true cost of ‘being flexible’
Late payments do not just create stress. They create knock-on costs:
- You spend time chasing instead of selling or delivering
- You delay suppliers and risk relationships
- You make worse decisions under pressure
5.2 Quick fix: tighten terms without sounding harsh
You can be firm and professional at the same time:
- Put payment terms in writing before work starts
- Take a deposit for projects with upfront costs
- Use staged payments tied to milestones
6. Mistake #5:
Weak credit control and slow chasing
Most businesses do not have a “late payer problem”. They have a “late chasing problem”.
If you only chase when you are desperate, customers feel it, and it becomes harder to be consistent.
6.1 What to measure: debtor days and overdue buckets
Two simple measures make cash visible:
- Average debtor days over the last 3 months
- Overdue invoices split into 0–30, 31–60, 61–90 days
6.2 Quick fix: build a chasing sequence
Keep it predictable, and it stops feeling awkward:
- 3 days before due: friendly reminder with invoice attached
- 1 day after due: confirm payment date and method
- 7 days after due: phone call and clear next step
7. Mistake #6:
Overinvesting in stock, tools, or projects at the wrong time
Cash often gets trapped in stock, equipment, or “nearly finished” projects. The business looks busy, but the money is tied up.
7.1 Working capital and ‘cash trapped in stuff’
Working capital is the cash tied up in day-to-day trading. It increases when:
- Stock levels rise faster than sales
- Work in progress builds up without being invoiced
- Customers take longer to pay as you grow
7.2 Quick fix: set purchase rules and reorder points
Simple guardrails protect cash:
- Set a maximum stock cover in weeks
- Agree spending limits without approval
- Invoice partially completed work where appropriate
8. Mistake #7:
Mixing personal and business spending (even a little)
Mixing costs blurs reality. Once the numbers are blurred, decisions get slower, and tax positions get riskier.
8.1 Why it breaks decision-making
When spending is mixed:
- You cannot trust the profit figure month-to-month
- You struggle to set a sustainable pay level
- Bookkeeping takes longer and errors increase
8.2 Quick fix: clean boundaries and a drawings plan
Make it boring and consistent:
- One business card for business costs only
- A scheduled monthly transfer for personal spending
- Regular review of director loan balance if relevant
9. Mistake #8:
Forgetting the ‘lumpy’ bills (tax, insurance, annual renewals)
Some bills are predictable, but not monthly. They catch people out because day-to-day trading feels manageable until the big payment lands.
9.1 The bills that always arrive at the worst moment
Common examples include:
- VAT bills and PAYE payments
- Corporation tax and payments on account
- Annual insurance and software renewals
9.2 Quick fix: sinking funds in separate pots
I like “pots” because they remove decision fatigue:
- Transfer a set amount weekly to a VAT pot
- Transfer a set amount weekly to a tax pot
- Transfer a set amount monthly to an annual bills pot
10. Mistake #9:
Pricing that ignores cash reality
You can be “well priced” on paper and still struggle if you are funding delivery for weeks or months.
10.1 Margin is not enough if you get paid late
Pricing problems show up as cash flow problems when:
- You pay subcontractors before you invoice clients
- You have long projects with no staged billing
- Your best-selling service is also the slowest to pay
10.2 Quick fix: change payment structure, not just price
Often, structure fixes more than a price rise:
- Move to upfront deposits for project starts
- Use monthly retainers for ongoing delivery
- Offer card payments or direct debit options
11. Mistake #10:
Waiting too long to get proactive finance support
By the time cash is tight, you are making decisions under pressure. That is when mistakes happen: missed VAT deadlines, rushed borrowing, or reactive tax planning.
Proactive support is less about fancy reports and more about having the basics consistently right, with someone watching the numbers with you.
11.1 What good month-to-month finance support looks like
In practice, this is what I aim to give business owners at AVMK Accountants, depending on the package:
- Up-to-date bookkeeping, not backlog surprises
- Clear VAT planning and proactive deadline handling
- Management accounts that explain what changed and why
- Cash flow forecasting you can actually use
We work on fixed fees, agreed upfront, so you know what support costs each month and you are not second-guessing whether to ask a question.
11.2 A simple next step if you want clarity
If you recognise a few of these cash flow patterns, the next step is usually to get your numbers up to date, then build a simple 13-week forecast and a VAT plan.
If you want, book a free initial consultation with AVMK Accountants. I’ll ask a few questions, look at what is currently happening, and tell you what I would fix first.
Happy to help.
