Your year-end accounts tell you what already happened. They cannot tell you whether you will have the cash to cover payroll and the VAT bill next March. That gap is where a financial model earns its place.
A model is not a spreadsheet of your hopes. Done well, it is the one document that treats profit and cash as two separate things, because they are.
The question every forecast has to answer
Most owners forecast sales, subtract costs, land on a profit figure, and stop there. The harder question is the one that matters: if that profit is real, where does the cash actually go?
Growth is where this bites hardest. Win a large client and your profit rises. So does the money locked up in unpaid invoices, stock, and staff you paid before the work was billed. A genuinely profitable year can still leave you unable to make payroll. In 2025 there were 22,455 business insolvencies in England and Wales, a rate of 116 per 10,000 businesses and well above the 88 per 10,000 recorded in 2019. Plenty of those firms were profitable on paper right up to the end.
What a three-statement model actually is
A three-statement model links your three core financial statements so they move as one.
The profit and loss, or P&L, shows profit over a period: sales, minus costs, equals profit. The balance sheet is a snapshot at a single date of what you own and what you owe. The cash flow statement tracks the actual money moving in and out of the bank.
The value is in the links, not the individual sheets. Profit flows from the P&L into the balance sheet. Movements on the balance sheet, such as customers taking longer to pay, feed straight into cash. Change one assumption and all three respond together. A forecast that models only the P&L hides the precise risk that shuts businesses down.
One year, three very different stories
Take Northgate, an illustrative 10-person design agency in Manchester turning over £900,000. The owner lands a retail client and forecasts a 30% jump to £1,170,000.
The P&L looks excellent: net profit of £108,000 at a 12% margin. On that page alone, a superb year.
The balance sheet tells the second half of the story. The new client pays on 60-day terms, so debtors, the money customers owe you, climb from £150,000 to £220,000. That extra £70,000 is profit you have earned but cannot yet spend.
The cash flow statement makes it plain. Start with £108,000 of profit. Subtract the £70,000 trapped in unpaid invoices. Subtract another £30,000 for two people hired before the new revenue landed. You are left with £8,000 of actual cash, not £108,000. Same business, same year, three completely different stories depending on which statement you read.
Two mistakes cause most of the damage: forecasting revenue you cannot yet prove, and never linking the statements, so working capital swells invisibly as sales grow.
The one thing to do this week
Open last year’s accounts. List your three largest customers and the exact number of days each one takes to pay. Take your forecast monthly sales, multiply by those days, then divide by 30. That figure is roughly how much cash your growth will tie up in debtors. Put it on a single line beneath your profit forecast. It is the number most models leave out, and the one most likely to catch you out.
Building the model is the easy part. Reading it every month is what changes decisions. FinanceMOT scores your financial health from 0 to 100 across four pillars, Liquidity, Profitability, Efficiency and Solvency, so the gap between profit and cash shows up as a score rather than a shock. Track that score across several periods and the Northgate problem, rising sales quietly draining the bank, becomes visible long before it becomes urgent.
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