At some point in your startup’s growth, someone – an investor, a bank, or your accountant – will mention a 3-way financial forecast. Here’s what it actually is, what each piece does, and how to know when you need one.

What is a 3-way financial forecast?

A 3-way financial forecast brings together three core financial statements into one integrated model:

1. Profit and loss (P&L)
2. Balance sheet
3. Cashflow statement

Each one tells you something different about your business. Together, they give you a complete picture of where you are, where you’re headed, and whether you’ll have the cash to get there.

Starting out: P&L and cash is usually enough

Most founders have a solid grasp of how their business makes money and what it spends. That’s essentially what your P&L captures – revenue in, expenses out, and what’s left over.

In the early stages, keeping a close eye on your P&L alongside a simple cash forecast is usually sufficient. Many startups operate this way for as long as it makes sense – and there’s nothing wrong with that. Simplicity is a feature, not a flaw, when your business is still finding its feet.

When the P&L stops telling the full story

There’s a point where your P&L starts giving you an incomplete picture – and it usually shows up as a cash surprise. The classic sign: your business looks profitable on paper, but cash is tighter than it should be.

That’s because a P&L doesn’t capture everything that affects cash. Your balance sheet does.

A few of the things your P&L won’t show you:

Compliance payments – Super is payable quarterly. GST and PAYG withholding land through your BAS. If you’re profitable, you’ll have income tax or quarterly PAYG instalments to plan for. These are predictable, but they catch plenty of founders off guard. If you’re accessing the R&D Tax Incentive, your forecast should also account for timing of that refund from the ATO.

Accounts receivable and payable – If you’re invoicing customers and waiting on payment, your cash position can deteriorate fast even when revenue looks healthy. The gap between invoicing and actually receiving money – sometimes called debtor days – needs to be built into any meaningful forecast. The same logic applies on the other side: when you owe suppliers, the timing of those payments matters.

Loans – Any interest-bearing debt needs to be accounted for: principal repayments, interest, ATO payment plans, shareholder loans. These hit cash in ways that don’t always show up clearly in a P&L.

Revenue recognition and prepayments – If customers pay you upfront on annual contracts, that cash lands in your account before you’ve technically earned it. Accounting rules require you to recognise it as revenue over the contract period – not all at once. Investors and banks will expect your forecasts to reflect this correctly. Similarly, if you’re prepaying suppliers for subscriptions, insurance or rent, those need to be accounted for as prepayments rather than immediate expenses.

The balance sheet is where all of this timing complexity lives. As it grows in complexity, managing it properly inside a 3-way forecast becomes less optional.

The cashflow statement: the third piece

The cashflow statement is essentially a restatement of your P&L and balance sheet movements, reorganised to show the nature of cash coming in and going out – split into operating, financing and investing activities.

It’s the most transparent view of what your business is actually doing with money. That said, investors and banks typically focus first on whether your P&L and balance sheet forecasts are solid – the cashflow statement becomes more prominent at scale or when you’re managing multiple funding sources.

So do you actually need a 3-way forecast?

Here’s a rough guide:

If you’re early-stage and keeping things simple, a P&L and basic cash forecast will do the job. When you start juggling compliance payments, receivables cycles, loans or pre-payments – or when you’re preparing for a capital raise – a 3-way forecast gives you and your investors the confidence that your numbers are telling the full story.

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