The 3-statement financial model, explained
How the P&L, balance sheet and cash flow fit together, and why investors want to see all three month by month.
7 November 2026 · 7 min read
A three-statement financial model links the income statement, the balance sheet and the cash flow statement so that a change in one assumption flows correctly through all three. It is the standard investors expect. A revenue forecast or a P&L on its own can't show when you run out of cash.
The three statements
Income statement
Also called the profit and loss (P&L). Revenue minus costs over a period gives profit. It shows whether the business makes money, but not when cash moves.
Balance sheet
A snapshot at a point in time: what the company owns (assets), owes (liabilities), and the shareholders' stake (equity). Assets always equal liabilities plus equity.
Cash flow statement
How cash actually moved: from operations, from investing (equipment, capital spend) and from financing (equity raised, loans). It explains the change in the bank balance.
How the statements link
The value of the model is in the links. These are the connections that must hold every month:
- P&LIncome statementRevenue − costs = net profit
- Cash flowCash flow statementProfit ± non-cash items ± working capital ± investing ± financing
- Balance sheetBalance sheetCash, assets, liabilities, equity (incl. retained earnings)
- Net profit from the income statement is the starting line of operating cash flow, and it is added to retained earnings on the balance sheet.
- Non-cash costs such as depreciation are added back in the cash flow and reduce the asset's value on the balance sheet.
- Working capital changes (customers paying late, paying suppliers later, stock) move cash without touching profit. A growing business that is profitable on paper can still run out of cash.
- Capital spend appears in investing cash flow and adds to fixed assets. It hits the income statement only gradually, through depreciation.
- Equity and loans appear in financing cash flow and on the balance sheet. Interest goes through the income statement.
- The closing cash from the cash flow statement is the cash line on the balance sheet.
The two checks that prove it works
- Check 1Assets = liabilities + equityEvery month, to the penny
- Check 2Cash flow closing cash = balance sheet cashEvery month
If either check fails in any month, something is missing or double-counted. Investors know this, and a balance sheet that doesn't balance is one of the fastest ways to lose credibility in due diligence.
Why monthly, not annual
Startups live and die by cash timing. An annual model can show a healthy year-end balance while the business ran out of cash in month seven. Investors in early-stage companies expect monthly figures for at least the first two to three years, then quarterly or annual.
Don't forget tax timing
VAT (or GST or sales tax) is collected on sales and paid to the tax authority later, so it moves cash but is not revenue. Corporation tax is usually paid months after the year end. Payroll taxes and pensions add to the cost of every hire. Each of these changes the cash picture and belongs in a proper three-statement model.
How Caiflo builds it
Caiflo works out the full monthly P&L, cash flow and balance sheet from what you tell it about your products and prices, demand, team, overheads, equipment, funding and payment terms. Click any number to see the formula behind it. The balance sheet balances every month; we test that on 300 randomly generated models every time we release an update. You can also download the whole model to Excel with working formulas.