What is XIRR and why use it for angel investing ?

XIRR calculates annualized returns on irregular cash flows with dates—perfect for lumpy angel timelines, unlike simple averages.

When should I stop using Excel for my angel portfolio?

At 10+ investments, follow-ons, or exits—when portfolio XIRR becomes a manual nightmare.

How do I calculate portfolio-level XIRR manually?

Build a transaction log: list all dates and amounts chronologically, then =XIRR(amounts, dates) in Excel or Google Sheets.

🛠️ Developer Tools

Excel's XIRR Crumbles at Your 10th Angel Deal—Here's the Fix

That gleaming 44.2% XIRR on your first angel hit? It vanishes when your portfolio swells past 10 deals. Time to rethink your tracking—or watch true performance evaporate.

theAIcatchup Apr 10, 2026 4 min read

Broken Excel spreadsheet with scattered XIRR cash flows for angel portfolio

⚡ Key Takeaways

Excel's company-row spreadsheets make portfolio XIRR impossible beyond a handful of deals. 𝕏
Switch to transaction-based logs for true IRR, ownership tracking, and tax prep. 𝕏
Ditch sheets at 10+ investments—your portfolio deserves pro tools, not hacks. 𝕏

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theAIcatchup

Community-driven. Code-first.

#Excel spreadsheets #XIRR #XIRR calculation #angel investing #excel limitations #portfolio tracking

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Originally reported by Dev.to

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