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CFO & Strategy

Financial Modeling for Startups

Written by Harry Prabandham

Curated by Rubric Financial

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Model Architecture & Best Practices

  • Structure your model with separate tabs: Assumptions, Revenue, COGS, OpEx, Headcount, Cash Flow, and Summary Dashboard
  • Use a driver-based approach: link all outputs to a small set of clearly labeled input assumptions that can be easily toggled
  • Color-code cells consistently: blue for inputs/assumptions, black for formulas, green for links to other tabs
  • Build monthly granularity for the first 18-24 months, then quarterly or annual for years 3-5

About the author

Harry Prabandham

Founder & CEO

Founder and CEO of StartupCFO. MBA from Wharton, MS in Computer Science, and decades of experience building and advising venture-backed startups.

More articles by Harry →

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