How to improve cash flow in a South African small business
Cash flow is the timing of money in and money out. A profitable business can still run out of cash, because customers pay late while rent, wages and the South African Revenue Service (SARS) do not wait.
In short
- Profit is what you earned. Cash is what you can spend. The gap between them is where businesses get into trouble.
- A 13-week cash forecast shows a shortfall weeks before it arrives, which is when you can still do something about it.
- The fastest wins are usually invoicing sooner, following up earlier and agreeing deposits.
- Diarise your SARS dates. PAYE, UIF and SDL are due by the 7th of each month, and late tax costs 10.25% a year in interest.
Profit is not cash
You can make a profit on paper and still have an empty bank account. Common reasons:
- You have invoiced, but the customer has not paid.
- You bought stock or equipment, which cost cash but is not yet an expense in your profit.
- You paid tax, a loan instalment or your own drawings, none of which show as a cost in the same way.
Cash flow management is the habit of looking ahead at when money will actually move.
Build a 13-week cash forecast
A 13-week forecast is a simple weekly table that looks one quarter ahead.
- Start with your bank balance today.
- List cash coming in by week: customer payments you expect, based on when they usually pay, not when the invoice is due.
- List cash going out by week: wages, rent, suppliers, loan repayments and tax.
- Work out the closing balance each week and carry it forward.
- Update it every week, replacing forecasts with actuals.
A small example:
| Cash forecast | Week 1 | Week 2 | Week 3 | Week 4 |
|---|---|---|---|---|
| Opening cash | R80,000 | R62,000 | R25,000 | R41,000 |
| Customer receipts | R30,000 | R20,000 | R60,000 | R25,000 |
| Suppliers and rent | -R28,000 | -R32,000 | -R14,000 | -R30,000 |
| Wages | -R20,000 | 0 | -R20,000 | 0 |
| SARS (PAYE, UIF, SDL, VAT) | 0 | -R25,000 | -R10,000 | 0 |
| Closing cash | R62,000 | R25,000 | R41,000 | R36,000 |
Week 2 is the warning. Cash is thin, and if a customer pays late the business cannot cover wages in week 3. With a forecast you see that in week 1.
Speed up money coming in
- Invoice the day the work is done, not at month end.
- Ask for a deposit or stage payments on larger jobs.
- State your payment terms on every invoice, and keep them short.
- Make paying easy: bank details, a payment link, a debit order.
- Follow up early. Read our guide to getting customers to pay on time.
Slow down money going out, safely
- Negotiate supplier terms, for example 30 days instead of 7.
- Pay on the due date, not early, unless there is a discount worth taking.
- Hold less stock. Money sitting on a shelf is money you cannot use.
- Lease or finance large equipment where it protects cash, but count the repayments in your forecast.
Plan for SARS dates
Tax is the payment most businesses forget to put in the forecast.
- PAYE, UIF and SDL: due with your monthly EMP201 by the 7th of the following month.
- VAT: due on the return dates for your VAT period. Note that VAT is due on invoices, so you can owe SARS for a sale before the customer pays you.
- Provisional tax: for individuals, the periods fall in August and February, with a voluntary top-up period afterwards. Companies follow their own year end.
- Interest on late or underpaid tax: 10.25% a year from 2 March 2026.
What to do now
- Build your first 13-week forecast this week, even if it is rough.
- Put every SARS payment date in it.
- Find your slowest-paying customers and change how you bill them.
- Agree one supplier term extension this month.
- Set a weekly 20-minute cash review and keep to it.
Frequently asked questions
How much cash should I keep in reserve?
Many owners aim for enough to cover fixed costs for a few weeks to a few months. The right figure depends on how predictable your income is. Your forecast will show what you actually need.
Is a bank overdraft a good fix?
It can bridge a timing gap, but it costs interest and does not solve a recurring shortfall. Use the forecast to tell which one you have.
What is the difference between cash flow and profit?
Profit is income minus costs over a period. Cash flow is the money that actually moves in and out of the bank in that period.
Sources and further reading
- Budget 2026 Frequently Asked Questions (SARS interest rates, provisional tax dates, EMP201 deadline), South African Revenue Service
This article is general information for South African businesses. It is not tax, legal or financial advice, and it reflects the rules and figures at the date shown above. Tax rules change, so confirm the current position before you act. TBL's practitioners are registered tax practitioners.