Why does Financial Model matter?
A model is not a promise about the future, it is an argument about how the business works, and that is why investors read one. The output number is nearly always wrong; the assumptions and the way they connect are what tell a reader whether you understand your own drivers. Internally it is the only tool that answers questions like how many people you can hire, how much to raise, and when the cash low point arrives, before the answer arrives on its own.
What does Financial Model look like in practice?
Suppose you are deciding whether to hire two salespeople now. A model that grows revenue 15% a month answers nothing, because the hire is nowhere in it. A driver-based version says each rep costs $15k a month fully loaded, ramps for three months, then closes two deals a month at $1k of monthly recurring revenue each. Run it out and the cash trough lands around month ten, roughly $190k deeper than not hiring, with the monthly line crossing back over in month eleven. Now the question is answerable: do you have $190k and eleven months, and using gross profit rather than revenue pushes the crossover later still.
What are the common mistakes with Financial Model?
- Building it backwards from a number already decided. A model that exists to justify a raise size teaches the founder nothing and reads as decoration to anyone who checks the drivers.
- Modeling revenue in detail and costs as a lump. Costs are the side you actually control and can forecast, so leaving them vague throws away the part of the model most likely to be close to right.
- Treating it as a forecast to be right about rather than a tool for comparing two decisions. The comparison is useful even when both branches are wrong in absolute terms.
- Never running it against actuals. A model that is not corrected each month is a record of what you believed once, and its assumptions never get tested.
Related concepts
- Burn Rate and RunwayBurn rate is how much cash you lose per month; runway is how many months of it you have left before the money runs out.
- Round SizingHow much you raise, chosen as the amount that buys enough time to reach the next milestone that changes what you can prove, and stated in the pitch alongside what it buys.
- Unit EconomicsWhat it costs to acquire and serve one customer versus what that customer is worth. The question of whether the business works at the level of a single customer.
- Cash Flow vs. ProfitProfit is what the accounting says you earned in a period. Cash flow is what actually moved in and out of the bank. A company can be profitable on paper and still run out of money.
- Annual Operating PlanThe year's strategy expressed as numbers somebody is accountable to: what will be spent, what it is expected to produce, and who owns each part.