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What The First 90 Days Of A CFO Should Really Change
- May 25
- 6 min read
A good CFO will never spend the first 90 days simply “getting across the business”.
Of course, there is always a period of listening, review and diagnosis. No experienced CFO walks into an organisation and starts making confident recommendations without first understanding the numbers, the people, the systems, the operating rhythm and the commercial pressures sitting underneath the surface.
But by day 90, somethings should have started to change.
Not everything will be fixed. In some organisations, the finance function has been under strain for years. Reporting may still be late, cashflow may still be unclear, the board pack may be too dense to be useful, and the CEO may have still be the person holding too much of the financial judgement alone.
Those issues do not disappear in three months.
But the organisation should no longer feel as though it is spiraling.
By day 90, there should be a clearer financial rhythm, a better understanding of the real risks, more reliable reporting, and a leadership team that can see what needs attention first. The value of a CFO is not just in the technical work they do. It is in the confidence, discipline and decision clarity they start to restore.
For me, the first 90 days of a CFO engagement usually need to create visible change across five areas.
Top 5 things that will change in the first 90 days of a CFO
1. A clearer version of financial truth
My first job is always to work out whether the numbers can be trusted.
That does not mean chasing perfection. It means understanding whether the financial information is reliable enough for leadership, board and operational decisions.
In many organisations, the problem isn't that nobody is working hard - Finance teams are usually working very hard inside systems, spreadsheets and reporting cycles that have become too fragmented, too manual, or too dependent on individual knowledge.
By day 90, the CFO should have identified:
where the numbers are reliable;
where reconciliations, accruals or classifications need attention;
whether cash, revenue, margin and working capital are being reported clearly;
which reports are useful, and which are just producing noise;
what needs to be fixed immediately, and what can sensibly wait.
A CEO or board cannot make calm decisions from numbers that feel uncertain nor can a finance team cannot improve its rhythm if it is forever compensating for weak processes or unclear expectations.
The first change, therefore, is not dramatic, it is simply the return of a more honest and useful financial picture.
2. Reporting needs to become more decision-ready
Many organisations have reports, but not insight. There are profit and loss statements, balance sheets, spreadsheets, board papers and commentary. What they do not always have is a clear explanation of what the numbers mean, what has changed, what needs attention, and what decisions now sit in front of leadership.
A CFO should improve the reporting rhythm quickly.
By day 90, the CEO and board should be seeing reporting that is more focused, more timely and more useful. The finance pack does not need to become longer. In many cases, it needs to become shorter, sharper and more clearly connected to the decisions the organisation is actually trying to make.
The practical changes may include:
a weekly or fortnightly cashflow view;
a clearer monthly management report;
a board pack that separates information from decision points;
commentary that explains movement, risk and priority;
fewer unexplained variances;
a clearer view of what is urgent, what is emerging and what is simply noise.
The important shift is that finance stops being a backward-looking reporting exercise and starts becoming part of the leadership rhythm, so that there is a shift away from "What does this tell us about last month" to “What does this tell us about what we need to do next?”
3. Cashflow needs to become visible before it becomes urgent
Cashflow pressure rarely appears without warning. There are always signals
Debtors Grow
Supplier payments tighten
Meeting Payroll becomes more uncomfortable
Revenue timing slips
Funding assumptions become optimistic
The CEO starts checking the bank account more often than they would like to admit.
A CFO must bring those signals into the open early.
By day 90, the organisation should have a clearer view of cash, working capital and short-term pressure points. This does not mean every cash issue has been solved. It means the leadership team should no longer be surprised by what is coming.
A proper CFO rhythm will usually examine:
the current cash position;
expected cash inflows and outflows;
accounts receivable quality and collection timing;
supplier payment pressure;
payroll and statutory obligations;
debt, funding or grant timing;
the assumptions sitting underneath the forecast.
This is often where the emotional value of a CFO becomes most visible.
When cash is unclear, leaders become reactive. Conversations become tense, decisions become rushed, and small issues start to feel much larger than they are. When cash is visible, the same leadership team can make more measured decisions, even when the position itself is difficult.
The work is not always glamorous. It may involve debtor follow-up, invoice discipline, payment timing, forecast rebuilds and uncomfortable conversations about expenditure. But done properly, it creates a buffer zone of time to act on indicators before the cash pressures becomes acute.
4. The financial agenda needs to connect with the operating reality
A CFO is not there simply to tidy the accounts. The CFO needs to understand how the organisation actually works.
Where is revenue created? Where is value leaking? Which services, programs, clients, products or contracts are carrying the business, and which ones are quietly consuming capacity without enough return? Which costs are fixed, which are variable, and which are simply habits that have never been properly challenged?
By day 90, the financial conversation should be better connected to the operating model.
That might mean clearer reporting by service line, program, branch, project, contract or funding stream. It might mean separating profitable growth from busy growth. It might mean identifying where management effort is being absorbed by low-value activity. In a not-for-profit, it may mean understanding whether funding, staffing, compliance and program delivery are properly aligned. In a founder-led business, it may mean helping the founder see which decisions are genuinely strategic and which ones are simply operational noise wearing strategic clothing.
This is where CFO work becomes much more than accounting. Accounting tells you what happened. CFO leadership helps you understand what the pattern means, what choices are available, and what the organisation needs to do next.
5. The leadership team needs a steadier decision rhythm
The best CFO engagements change the rhythm of leadership.
That does not mean the CFO becomes the decision-maker for everything. It means the CEO, executive team and board are no longer making major decisions without a clear financial frame.
By day 90, there should be a more disciplined cadence around the numbers.
That may include a weekly cash and priorities discussion, a monthly management reporting meeting, a board finance summary, a forecast review, or a more structured conversation around risk, investment and trade-offs.
The important change is that financial leadership becomes regular, practical and calm.
This is particularly important in organisations that have outgrown basic finance support but are not yet ready for, or do not need, a full-time CFO. A strong Fractional CFO rhythm can give the organisation senior financial leadership without adding unnecessary executive cost. An Interim CFO can stabilise the position quickly when there has been a leadership gap, a reporting issue, a transition, or a period of financial pressure.
The model may differ, but the outcome should be similar - The CEO should feel less alone.
The board should have clearer oversight.
The finance team should know what matters most.
The organisation should have a better grip on cash, reporting, risk and decision-making.
That is the real value of CFO leadership. Not more numbers for the sake of numbers.
Better financial judgement, stronger rhythm and decisions made with clearer eyes.
Need stronger financial rhythm in your organisation?
Diamond Advisory provides Fractional CFO and Interim CFO support for established and growing organisations that need clearer cashflow, stronger reporting, tighter financial control and more useful financial insight.
If your organisation needs this kind of financial rhythm
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