A model built from a growth rate is a guess with formatting on it. Revenue lands in row five, it grows twelve percent a month because that felt about right, half the assumptions are typed inside the formulas where nobody can find them, and cash never runs out because nobody modelled the forty five days customers take to pay. This financial model generator prompt makes you name the drivers before it writes a single line.
Paste it into Claude, ChatGPT or Gemini and it asks seven questions about your model, pricing, sales motion, hiring plan and payment terms. Back comes a build spec: every tab, every named input cell, and the formulas written out in full so you can type them straight into a spreadsheet. It covers unit economics, a headcount plan costed at loaded rates, working capital, a base, bear and bull case built by moving drivers rather than shrinking totals, and the sanity checks that catch a model that does not balance.
Three Statement Model Build Steps for Excel
For a full three statement model, the prompt writes the build in a fixed order so the statements link and the balance sheet balances every month.
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Schedules first: working capital, fixed assets, debt and equity built before any statement, with interest on opening balances so there is no circular reference
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Linked statements: income statement, indirect cash flow and balance sheet, with every balance sheet movement paired to one cash flow line
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Checks tab: balance check across all months, cash tie-out and the lowest cash month flagged at the top
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When it does not balance: how to read the size and pattern of the difference to find the broken line
One purchase covers every model you build after it. Rebuild for a new product line, a new pricing tier or a raise, and the same checks apply.