The income statement recognises revenue when it is earned. The cash flow statement records it when it arrives. A profitable month that went backwards on cash is the normal consequence of that gap, not a bookkeeping error.
The two statements answer different questions
The income statement, also called the profit and loss, asks whether the business made money over a period. The cash flow statement asks where the money went. Because the first is prepared on an accruals basis under the AASB accounting standards, revenue is recognised when it is earned rather than when it is banked, and cost is matched to the period it belongs to rather than the day it was paid.
That single convention produces almost every divergence you will see. A large invoice raised on the last day of the month lands in full on the income statement and contributes nothing to cash for another sixty days. Stock bought ahead of a season drains cash immediately and touches the income statement only as it sells. The ATO's guidance on choosing an accounting method sets out where the cash and accruals bases differ for GST, which is the version of this most Australian founders meet first.
The income statement gets a fuller treatment in what founders get wrong about profit and loss, including who should own it as you scale.
Which one to read, and when
| The question | The statement that answers it | |
|---|---|---|
| Did we make money this period? | Income statement | Performance on an accruals basis: revenue earned against the cost of earning it, regardless of when either was settled. |
| Can we pay everyone next month? | Cash flow statement | Actual movement in and out, including the timing of receipts and the working capital tied up in stock and debtors. |
| Why did a profitable month go backwards? | Both, read together | The reconciliation between them is where the answer lives: debtor days, stock movement, capital spend and timing of receipts. |
Founders tend to over-index on one and ignore the other. Reading only the income statement produces the business that is profitable on paper and cannot make payroll. Watching only the bank balance leaves margin quietly eroding while everything feels comfortable. Neither failure is exotic and both are avoidable by reading the pair.
Who should be explaining the gap
Producing both statements is a bookkeeping task. Explaining why they disagree, and what to do about it, is not. I have run a search where the previous person in the seat was a capable accountant whose financial reporting was done correctly, but who was not as strong on the relationship side. What the business actually needed was someone comfortable getting out into the business, talking about what the numbers mean, and working through how decisions change as a result.[1]
When that ownership is genuinely in place the change is visible quickly. Reporting gets clearer, forecasts become more believable, board prep gets less chaotic, cash conversations get more accurate, and hiring plans get properly tested before they become commitments.[2] That last one is the tell. A hiring plan signed off against a profitable income statement, with no reference to when the cash for those salaries actually arrives, is the most common way a growing Australian company talks itself into a problem.
For a business up to roughly twenty staff, the finance priorities are cash runway, burn rate, fundraising readiness and systems.[3] Every one of those is a cash question rather than a profit question, which is why the first finance hire at that stage needs to be fluent in the cash statement rather than merely accurate on the income statement.
If nobody currently owns this, the question is which hire fixes it. Here is when to make your first finance hire and what to expect it to change.
Common questions
What is the difference between a cash flow statement and an income statement?
An income statement reports performance over a period on an accruals basis, recognising revenue when it is earned and matching costs to the period they belong to. A cash flow statement reports money actually moving in and out. Because of that timing difference the two can describe the same month very differently, and both be correct.
Can a business be profitable and still run out of cash?
Routinely, and it is one of the more common ways a growing business fails. Revenue recognised on an invoice raised at month end contributes nothing to the bank for another sixty days. Stock bought ahead of demand drains cash immediately and only reaches the income statement as it sells. Profit and liquidity are separate questions and need to be read separately.
Which statement should a founder look at first?
Both, and specifically the reconciliation between them. Reading only the income statement produces a business that is profitable on paper and cannot make payroll. Watching only the bank balance leaves margin eroding while everything feels comfortable. For a company up to around twenty staff the priorities are cash runway, burn rate, fundraising readiness and systems, which are all cash questions.
Who in a finance team should explain the difference?
Producing both statements is a bookkeeping task. Explaining why they disagree and what to do about it is a commercial one, and it is where a capable technician and a capable finance lead separate. The person you want is comfortable getting out into the business, talking about what the numbers mean, and working through how decisions change as a result.
References
- From a search I ran: the previous person in the finance role was a capable accountant and the financial reporting was done correctly, but they were not as strong on the relationship side. What the business needed was someone capable and comfortable getting out into the business, talking about what the numbers actually mean, and talking through how decisions change as a result. Tom went into that skill with a finance leader in an episode of The CFO Track on financial storytelling.
- What I notice when someone properly owns finance in a startup: reporting gets clearer, forecasts become more believable, board prep gets less chaotic, cash conversations get more accurate, and hiring plans get properly tested before they become commitments.
- How I frame the priorities for startups up to circa 20 staff: cash runway, burn rate, fundraising readiness and systems.