Raise money

What is a SAFE and how does it actually work?

The short answer

A SAFE (Simple Agreement for Future Equity) lets an investor give you money now in exchange for equity later, when you raise a priced round, without setting a valuation today. It's fast, cheap, and standardized, which is why nearly all YC-style seed rounds use it. Use the official post-money SAFE and understand that post-money means investors' ownership is locked in before your next round dilutes it.

Go deeper, your way

3 hand-picked resources, 3 link-checked. Pick how you want to dig in.

📄 Article
✓ Link checked Free Intermediate

Why we picked it YC's fundraising library collects the canonical explainers on how SAFEs convert, how caps and discounts work, and how they dilute you. The most trustworthy free explanation of the instrument almost every seed round uses.

A Guide to SAFEs, Caps, and Discounts (Startup Library)

From Y Combinator Startup Library by Kirsty Nathoo / Y Combinator varies

  • A valuation cap sets the max conversion price; a discount gives a percentage off the next round
  • Stacked SAFEs at different caps all convert together and can add up to serious dilution
  • Model the conversion before agreeing terms, not after
Open ycombinator.com
📄 Article
✓ Link checked Free Intermediate

Why we picked it The reference primer on the metrics and market-sizing logic investors use, including bottom-up market sizing that keeps founders honest about how big a market really is. Canonical a16z source.

16 Startup Metrics

From a16z by Andreessen Horowitz (a16z) ~15 min read

  • Size markets bottom-up from customer count and willingness to pay
  • Know the metrics that actually signal a healthy business
  • Distinguish real traction from vanity metrics
  • Use consistent definitions when comparing yourself to the market
Open a16z.com
🛠️ Tool
✓ Link checked Free Intermediate

Why we picked it The primary source for the SAFE itself, plus YC's plain-English primer explaining post-money mechanics. Use the official document, not a random copy, and read the primer before you sign.

YC Safe Financing Documents (Official Post-Money SAFE)

From Y Combinator by Y Combinator templates + primer

  • Post-money SAFE lets you calculate investor ownership precisely and immediately
  • Five standard variants (cap, discount, MFN, etc.) plus an optional pro-rata side letter
  • It's a starting point usable in most situations without modification
Open ycombinator.com

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