Key takeaways

• Cash flow measures the money actually available, not profit: a profitable SME can still run short of cash.
• Steering it rests on two moves: tracking past flows and projecting future ones in a rolling forecast.
• The working capital requirement is cash flow's silent engine: stock and receivables tie the money up.
• Acting on customer payment terms is the fastest lever to ease a tight cash position.

Cash flow: what the income statement does not show

An SME can post a positive result and still, on the 28th of the month, be unable to pay salaries. That paradox is the whole point of SME cash flow management: profit is calculated over a period, whereas cash flow is lived day by day, in the rhythm of real receipts and payments. The income statement tells you whether the activity is profitable; it does not tell you whether there will be money in the account next Monday.

The distinction is concrete. You invoice 10,000 EUR in June, the sale is booked as income, your result improves. But if the customer pays on 60-day terms, that money only arrives in August. In between, you have advanced the VAT, paid your suppliers and your salaries. It is this timing gap, not profitability, that triggers cash strain.

Tracking cash flow: receipts, payments and balance

Tracking is the foundation: without a reliable picture of the recent past, no forecast holds. It means reconciling, every week, what has actually entered and left the bank account against what was planned. The gap between the two is the most useful signal: it exposes invoices paid late, forgotten spending and your customers' habits.

That reconciliation is tedious by hand, but it becomes fast as soon as the bank and the invoicing talk to each other. That is the point of automated bank reconciliation: each payment received is matched to its invoice, and the available balance reflects reality without re-keying.

Building a cash flow forecast

The cash flow forecast turns tracking into a decision tool. The principle is simple: start from the current bank balance, add the expected receipts and subtract the certain outflows, period by period. A rolling table, updated every week, shows where the balance drops below zero before the situation becomes critical.

1. 1

   Start from the real balance

   Step 1

   Today's bank balance, across all accounts, is the starting point.

2. 2

   List the expected receipts

   Step 2

   Customer invoices by their real due date, deposits, grants, capital: what will come in and when.

3. 3

   List the certain outflows

   Step 3

   Salaries, VAT and social charges, suppliers, rent, loan repayments, tax deadlines.

4. 4

   Calculate the projected balance

   Step 4

   Opening balance plus receipts minus payments, for each week or each month.

5. 5

   Update and compare

   Every week

   Every week, replace the forecast with the actual and roll the horizon forward: the forecast stays rolling.

The useful horizon depends on your business. A short horizon, four to eight weeks, is enough to avoid a payment incident; a twelve-month horizon informs investment and hiring decisions. The two complement each other: the short term protects, the long term guides.

Working capital, the silent engine

Behind most cash strains sits the working capital requirement: the money the operating cycle permanently ties up. It comes down to a subtraction: stock plus customer receivables minus supplier payables. As long as your customers have not paid you and your goods sit in stock, that money is missing, even if the business is profitable.

Working capital explains why rapid growth can drain cash. The more you sell, the more receivables and stock you carry before being paid; the financing need grows with turnover. Steering cash flow therefore means watching these three items as closely as the bank balance itself.

The monthly cash flow review

• Reconciled bank balance

  Every payment received is matched to its invoice; the balance reflects reality.

• Customer receivables up to date

  A list of overdue unpaid invoices, ranked by age, with reminders scheduled.

• Outflows for the next 8 weeks

  Salaries, VAT, suppliers and tax deadlines placed on their certain date.

• Refreshed balance forecast

  The rolling table is updated and any first shortfall is identified.

• Dormant stock spotted

  Slow-moving items that tie up cash are flagged.

Acting on payment terms

The fastest lever on cash flow is not the extra sale, it is collecting sooner what is already invoiced. In Belgium, payment terms between businesses are framed by law: absent an agreement, payment falls due within 30 days, and an agreed B2B term may in principle not exceed 60 days. The detail of the rules is covered in our guide to payment terms between businesses. The European reference framework is Directive 2011/7/EU on combating late payment.

Beyond the legal framework, three habits move the collection date: invoice immediately after delivery, chase unpaid invoices methodically rather than case by case, and ask for a deposit on large orders. Our article on how to reduce late payments sets out the reminder sequences that work.

Cash flow under control, without a spreadsheet to re-copy

YouInv links your invoices and your bank accounts: receipts matched automatically, reminders triggered, balance up to date at a glance.

Create an accountSee pricing

Tool the tracking rather than endure it

A cash flow spreadsheet works, until the day it becomes the bottleneck: every payment to re-match, every deadline to re-key, every reminder to write by hand. Tracking then happens too late, when the shortfall is already here. The role of a connected invoicing tool is to remove the re-keying: issued invoices feed the forecast, received payments match themselves, and the available balance reads at a glance.

The point is not to produce a pretty table but to keep it accurate at all times. A wrong forecast reassures you for the wrong reasons; a forecast kept up to date, even roughly, genuinely protects. That is what an SME gains by linking its invoicing, its bank and its reminders in a single flow.

Further reading

• Bank reconciliation: automating payment matching: the basis of a reliable balance.
• Payment terms between businesses in Belgium: what the law says.
• Reduce late payments: reminders and good practice.

What is SME cash flow management?

Cash flow management means tracking the money coming into and going out of a business, projecting its bank balance over time and making sure it can meet its obligations. It deals with real flows (receipts and payments), not the accounting profit.

What is the difference between cash flow and profit?

Profit measures profitability over a period: income minus costs. Cash flow measures the money actually available at a given moment. A profitable business can still run out of cash if its customers pay late or if it ties up too much stock: the result is positive, but the bank account is empty.

How do you build a cash flow forecast?

You start from the current bank balance, list the expected receipts (customer invoices, grants, capital) and the certain outflows (salaries, VAT, suppliers, rent, loans) week by week or month by month, then calculate the projected balance. A rolling table, updated regularly, reveals shortfalls before they arrive.

What is working capital requirement?

The working capital requirement is the money tied up by the operating cycle: stock plus customer receivables minus supplier payables. The later your customers pay and the more you hold in stock, the higher the requirement and the heavier it weighs on cash flow.

How can an SME improve its cash flow quickly?

The fastest levers act on the customer cycle: invoice without delay, chase unpaid invoices methodically, shorten the terms you grant and negotiate deposits. Cutting dormant stock and staggering non-urgent spending also help the short-term balance.