TL;DR: The KPIs small business owners should review regularly are gross profit margin, net profit margin, operating cash flow, debtor days, wages as a percentage of revenue, and tax set aside. These numbers show if your work is profitable, if you can cover upcoming costs, and if your growth is sustainable.
Many KPI lists for small businesses include about twenty items, which can be hard to manage. By focusing on these six, you get clear alerts and spot opportunities without feeling overwhelmed.
The 6 KPIs Small Business Owners Should Review Monthly
Profitability: is the work paying?
1. Gross profit margin
Gross profit margin is your revenue minus the direct costs of delivering the work. This number changes first if your quotes don’t keep up with rising wages and materials.
2. Net profit margin
Net profit margin is what remains after you cover overheads. The gap between gross and net profit shows costs like software, vehicles, insurance, and admin wages that grow with your team. Keep an eye on this percentage — sometimes revenue goes up by 20%, but net margin drops, leaving you busy but short on cash.
Cash: can you fund what is coming?
3. Operating cash flow
This is what trading generates after suppliers, wages and tax are paid, which is the cash left to repay loans, buy equipment and pay yourself. A profitable month can still produce very little operating cash flow due to timing of payments and receipts.
Read it alongside a rolling 13-week forecast before you commit to any new hires.
4. Debtor days
Debtor days show how long it takes for your invoices to get paid. In Q3 2025-26, Australian small businesses waited an average of 24.1 days for payment, with payments arriving 6.9 days late. If your debtor days are higher, try using deposits, progress payments, and automated reminders.
Obligations: what is committed?
5. Wages as a percentage of revenue
This is your fastest-changing cost, and it goes up as soon as you hire someone. Compare your ratio to the ATO’s labour-to-turnover benchmark.
Super used to sit in your account for up to three months. With Payday Super, it now leaves with each pay run, so this ratio clearly shows what share of revenue goes out on payday.
6. Tax and BAS set-aside
Collectable small business tax debt was $35.9 billion at 30 June 2025, with an average of $26,800 owed by more than 1.3 million small businesses.
Compare what you’ve set aside to what you owe. A widening gap means you’re running on money that belongs to the ATO.
What Useful Reporting For Small Business Looks Like
Review these six numbers each month and compare them to last month and the same month last year. Add some notes about what has changed.
Next, include one or two operational measures that fit your business. For example, a builder might track work in progress and margin by job; a gym owner might track retention and revenue per member; and a clinic might track booked hours versus available hours.
The next step
If your revenue keeps going up but your cash does not, checking these six KPIs each month will help you find the problem before it hits your accounts.
Growth iQ is an accounting and business advisory firm based in Malvern. We support owners across Adelaide in construction, trades, and specialised services. Our bookkeeping is reliable, and our outsourced CFO services are practical. If you’re looking for a business advisor in Adelaide, book a free discovery call. We are here to help you plan your next steps.