Cash flow for small businesses: a simple working system

A business can be profitable on paper and still fail to make payroll. Profit is what is left after costs, measured over a period. Cash is what is in the bank today, and it is what pays salaries, suppliers and tax. The two are related but they are not the same number, and confusing them is one of the most common ways small businesses get into trouble.

This is a plain framework for keeping cash under control without hiring a finance team.

Why profit and cash diverge

• You invoice a large client, and count it as revenue — but the money arrives in sixty days.
• You buy stock or equipment up front, and recover the cost over months.
• You pay GST on invoices you have not been paid for yet.
• A single big client pays late, and a whole month's outgoings depend on it.

Step 1: know your runway

Runway is how long you could keep operating if income stopped today. Take your cash balance, divide it by your average monthly outgoings, and you have a number in months. It does not need to be precise to be useful — knowing you have roughly two months rather than six changes how you make decisions this week.

Step 2: shorten the gap between doing work and getting paid

Cash-flow problems are usually timing problems. The work is worth the same whether you are paid in fourteen days or sixty, but the difference in cash terms is enormous. Three levers do most of the work:

• Invoice immediately, not in a weekly batch.
• State short, clear payment terms and put the due date on the invoice.
• Follow up automatically rather than when you remember to.

Step 3: control the outflows

It is easier to control when money leaves than when it arrives. Look at your recurring costs — subscriptions, retainers, licences — and check whether each one is still earning its place. Moving large recurring payments to a date shortly after your usual inflow can smooth the month considerably. Where suppliers will accept it, aligning payment terms with what your customers give you narrows the gap you are personally financing.

Step 4: forecast, roughly

A useful forecast does not need a spreadsheet model. A simple weekly view of expected inflows and outflows over the next three months is enough to surface the weeks where the balance dips. The point is not accuracy — it is noticing a squeeze while you still have options.

1. Expected inflows: invoices with due dates in that week, weighted by how reliably that client pays.
2. Expected outflows: salaries, rent, supplier payments, and the tax you are setting aside.
3. Running balance: the number you are really watching.

Step 5: build a weekly rhythm

Cash flow is managed in small, frequent passes, not in one annual review. Thirty minutes a week is usually enough:

• Raise any invoice for work completed and not yet billed.
• Check what is overdue and confirm reminders are going out.
• Update the three-month view with anything that has changed.
• Decide if anything needs a follow-up call this week.

Where tools help, and where they do not

Software cannot fix a business that does not charge enough, and it cannot make a late-paying client pay on time. What it can do is remove the two failure modes that cause most small-business cash problems: invoices that never got sent, and follow-ups that never happened.

Fintog is being built around that idea — invoices that go out quickly, reminders that send themselves, and one clear view of what is outstanding so the weekly rhythm above takes minutes rather than an afternoon. It is launching soon. If that would be useful to you, join the waitlist and tell us what your current process gets wrong.

Updated 24 October 2026. This article is general guidance from the team building Fintog, not tax, legal or accounting advice.