By Rob Burger, small business finance and strategy consultant, 2XR Business Solutions
There is one financial truth every small business should take seriously: profit is sanity, cash flow is reality.
You can show profit on paper and still run out of money.
Many contracting building businesses fail not because the owner lacked skill, but because cash moved out faster than it came in. Cash flow isn’t an accounting exercise. It’s the fuel that keeps the business running.
Profit versus cash flow
Profit is the difference between what you charge and what it costs to do the job. Cash flow is the timing of when money enters and leaves your bank account.You can install a R10 000 air conditioner today and show profit, but if the client pays in 30 days while your suppliers want money immediately, you have a cash problem. That gap is where most small contractors struggle.
Cash flow can feel hard because working naturally creates uneven cash flow. Busy months, quiet months, late payers, upfront material costs and sudden tool replacements all hit at once. Without a plan, you end up juggling cash, delaying suppliers and dipping into personal savings.
The good news is you don’t need complicated systems.You need the following simple habits:
- Predicting cash flow: use a weekly forecast
A small air-conditioning business only needs a one-page weekly forecast.
How to do it:
- Take a sheet of paper or a basic spreadsheet
- Create four columns for the next four weeks
- Under each week list:
- Money in: expected customer payments
- Money out: materials, fuel, rent, wages and other expenses
- Subtract outflows from inflows to see the weekly cash position
Update this every Friday. Ten minutes of forecasting gives you a month’s visibility.You’ll know whether you can buy materials, take on another job or negotiate payment terms. It turns guesswork into planning.
- Managing cash flow: set clear rules
Strong cash flow comes from consistent habits.
Firstly, insist on deposits as much as possible. Every contractor should require a deposit, especially for bigger jobs. It covers materials and secures the customer. Standard practice is 50–70% upfront, with the balance on completion.
Secondly, invoice the same day. If you finish the job today, invoice today. Cash flow only improves when invoices go out quickly. Either don’t give payment terms or keep them short. You’re not a bank.
- Private clients: payment on completion
- Business clients: 7–14 days
- Longer terms create pressure you don’t need
Thirdly, know your monthly expenses. List the minimum expenses needed to keep your business operating. This is your break-even cash requirement. Once you know this number, you spot trouble months before it arrive.
Improve your cash flow
To improve your cash flow, here are some practical tips. These small improvements can make a big difference:
- Price your jobs properly
Include labour, materials, travel time, tool wear and a margin. Undercutting to win jobs drains cash and locks the business into survival mode.
- Separate personal and business money
Using one bank account for everything makes cash flow impossible to manage. Open a dedicated business account. Keep it clean.
- Build a small cash buffer
Aim for at least one month of expenses saved. Start with whatever you can manage each week. Over time it stabilises the business.
- Strengthen supplier relationships
Reliable payment earns trust. Good suppliers often give better terms or small extensions when you need them.
- Avoid impulse purchases of tools and other material
Tools matter, but timing matters more. Before you buy, ask: Will this pay for itself within six months? If not, wait.
Final thought
Cash flow doesn’t need to be complicated. It needs attention and simple routines. Understand how money flows in and out, keep your forecast updated and follow basic rules. Remember: profit is sanity, cash flow is reality. Manage your cash well, and you’ll build a stronger, more resilient business.
| About the author: Rob Burger CA(SA) is a finance and strategy consultant who helps small businesses, contractors and professionals simplify their finances and grow sustainably. He has 30 years of experience in business and now focuses on helping SMEs build stronger, more profitable enterprises. |
 Supplied by Rob Burger |
