Cash flow management is the practice of understanding when money enters and leaves a business, forecasting future positions, and taking actions to maintain sufficient cash to operate. For Australian small businesses, poor cash flow management is the leading cause of business failure — even among businesses that are profitable on paper.
For bookkeepers, cash flow advisory is one of the most tangible ways to provide value beyond compliance. A client who understands their cash position can make better decisions; a client who doesn't may not survive a slow month.
Why profit and cash flow are different
The confusion between profit and cash flow is genuinely common among small business owners. Understanding the difference is the foundation of cash flow management:
Profit = Revenue earned minus expenses incurred, measured on an accruals basis. An invoice raised is revenue; an expense incurred is recorded when the obligation arises, not when paid.
Cash flow = Actual cash received minus actual cash paid, in the period it flows.
The gap between them creates situations like:
- A profitable services firm with $150,000 of outstanding invoices is cash-poor because clients pay slowly
- A retailer buys $80,000 of stock in October for Christmas — profit doesn't hit until December, but cash is gone in October
- A GST refund of $12,000 is expected but hasn't arrived yet — it's an asset on the balance sheet but not in the bank account
The bookkeeper who can explain why a profitable client is worried about making payroll is providing genuine advisory value.
The four cash flow drivers bookkeepers should track
1. Debtor days
How long does it take customers to pay after invoicing? Calculate:
Debtor days = (Debtors / Revenue) × 365
An industry average debtor day figure is 45 days for professional services, 30 days for trade businesses, and 14 days for retail. If a client's debtors are running at 75 days, they are effectively financing their customers' operations with their own cash.
Practical actions: Review the aged debtors list at each reconciliation. Flag any invoice overdue by more than 60 days. Advise the client on their credit terms and whether they're being enforced.
2. Creditor days
How long does the business take to pay suppliers? A business that pays suppliers in 30 days but doesn't collect from customers for 60 days has a structural cash flow gap.
Actionable insight: if the client can negotiate 45–60 day payment terms with major suppliers while enforcing 30-day terms with customers, the cash flow position improves materially.
3. Inventory turnover (retail and trade)
For clients holding physical stock, inventory that sits for 90 days is cash sitting in a warehouse. Calculate:
Inventory days = (Inventory / COGS) × 365
High inventory days means the business is buying stock faster than it's selling. Lower inventory turnover periods improve cash flow.
4. BAS timing
For quarterly BAS clients, the GST collected from customers is held for up to 90 days before payment to the ATO. This is effectively a float — but it needs to be set aside, not spent. Many small businesses treat GST collected as available cash and then face a crisis when the BAS payment is due.
Advise clients to maintain a GST holding account — funds transfer to this account when GST is collected, and the BAS is paid from it. This prevents the BAS from being a surprise cash drain.
The rolling 13-week cash flow forecast
The most practical cash flow tool for small businesses is a rolling 13-week (3-month) forecast. It shows:
- Opening cash balance each week
- Expected receipts (customer payments, government grants, loan drawdowns)
- Expected outflows (payroll, rent, supplier payments, BAS, loan repayments)
- Closing cash balance each week
The 13-week horizon is long enough to see problems approaching (a payroll cycle that falls in a slow cash collection week), short enough to be actionable (you can contact debtors or arrange a short-term facility today to address a gap in week 6).
How bookkeepers can build this for clients:
Using the reconciled bank feed data in Reconlink as a base:
- Export last 12 weeks of transactions by category
- Build a rolling weekly schedule of fixed outflows (payroll, rent, loan repayments, BAS instalments)
- Project revenue inflows based on the invoice and payment cycle
- Identify weeks where the projected balance falls below the client's comfort threshold
The first build takes 2–3 hours. Monthly updates take 30–45 minutes. The value to the client is continuous visibility into a 90-day window they previously navigated blind.
Seasonal cash flow patterns
Many Australian small businesses have predictable seasonal patterns that create recurring cash flow challenges:
Retail: Pre-Christmas inventory build (October/November) drains cash before Christmas trading peaks. Post-Christmas stock clearance generates cash but at lower margins.
Construction: June quarter is typically strong as commercial clients push to settle invoices before financial year-end. January–February can be slow as commercial activity restarts after the holiday break.
Professional services: June quarter is busy with year-end work; the following quarter (July–September) can be quieter. Cash from June work may not be fully collected until August–September.
Medical practices: GP bulk billing creates flat cash flow (Medicare pays within 2 business days); specialist practices with significant patient billing can have longer debtor cycles.
Understanding the client's seasonal pattern helps the bookkeeper anticipate cash flow challenges and suggest interventions (invoice earlier, arrange a facility) before the client experiences the crisis.
Red flags the bookkeeper should flag proactively
Based on the reconciled data available in the bookkeeping system, flag these to the client or their advisor:
Accelerating debtor days: If debtors increased from 35 days last quarter to 52 days this quarter, the client may need to review their collections process.
ATO payment plan activity: If the client has entered a payment plan with the ATO, this indicates cash flow stress. Ensure the payment plan amount is coded correctly and the repayments are maintained.
Overdrawn bank account: A bank account that is regularly negative (using an overdraft) suggests ongoing cash flow deficit rather than a one-off event.
Deferred BAS payments: If the client is regularly requesting BAS deferral or lodging without paying, cash flow is the underlying problem.
Declining closing balance trend: If the bank closing balance is lower at the end of each month than the month before, the business is consuming cash. Identify whether this is seasonal or structural.
How to package cash flow advisory for clients
Most bookkeeping practices that offer cash flow advisory as a service include it in one of two ways:
As part of a premium retainer: A higher-priced monthly retainer that includes a monthly cash flow report, quarterly 13-week forecast update, and a 30-minute review call. Typical uplift over base retainer: $250–$600/month depending on complexity.
As a standalone add-on: A quarterly cash flow review service sold separately at a fixed fee ($350–$750 per quarter) for clients who don't want the full premium retainer.
The conversation with clients is simple: "Most of our clients are well-managed on compliance. The ones who grow fastest are the ones who also understand their cash. We can add a monthly cash snapshot to your service — here's what it includes and what it costs."
This article is general practice management guidance for bookkeepers. Cash flow forecasting for specific clients should be prepared based on their individual circumstances. This is not specific financial advice.