Hi there! 😊 Today we're going to walk through Y Combinator's (YC) SAFE (Simple Agreement for Future Equity) documents in detail — covering their background, the different versions available, and how they're actually used in practice. Key quotes from the source material are included in context to help with understanding!
1. Downloading SAFE Documents
SAFEs for U.S. Companies
YC provides three versions of the Post-money SAFE for U.S. companies, along with an optional Side Letter.
- Valuation Cap, no discount
- Discount, no valuation cap
- MFN (Most Favored Nation), no valuation cap and no discount
- Pro Rata Side Letter (preserving existing investor ownership rights)
- SAFE User Guide
SAFEs for Non-U.S. Companies (Canada, Cayman, Singapore)
Each jurisdiction has a Valuation Cap, no discount version and a Pro Rata Side Letter.
"Before using these international forms, you must consult with a qualified attorney in the relevant jurisdiction."
2. What Is a SAFE? (About the SAFE)
The Origins of the SAFE
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In late 2013, YC introduced the SAFE to help startups raise their initial funding.
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At the time, the "pre-money" SAFE was the standard form.
"The SAFE was a way for companies to get their first money in quickly and simply."
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The SAFE was designed to let companies receive early funding before a proper investment round like Series A.
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Early investors would gain the right to participate in future formal investment rounds.
Market Evolution and the Birth of the Post-money SAFE
- Over time, seed rounds grew larger, and SAFE-based fundraising became an independent financing round rather than a simple bridge.
- In 2018, YC launched the "post-money" SAFE.
The Core of the Post-money SAFE
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Post-money means the valuation is calculated after all the money raised via SAFEs has been accounted for (i.e., after SAFE investors' ownership is fixed), but before new capital from a formal round (e.g., Series A) comes in.
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What's the benefit?
"Both founders and investors can now immediately and precisely calculate how much of the company has been sold."
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Founders can clearly see exactly how much dilution they experience each time they sell a SAFE.
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Investors can transparently understand exactly how much ownership they are getting in the company.
3. Two Key Benefits of the SAFE
1) High Resolution Fundraising
- The SAFE lets investors and founders close a deal and receive funding as soon as they're both ready.
- There's no need to gather multiple investors at once — each investor can be handled quickly and individually.
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"Now that both founders and investors can more clearly and transparently understand what each is giving and getting, high resolution fundraising has become much easier."
2) Simple and Flexible Contract Structure
- The SAFE is a one-page document that allows for fast execution without complex term negotiations.
- It dramatically reduces legal fees and negotiation time.
- Typically, the only term to negotiate is the Valuation Cap.
- Because the SAFE has no maturity date or interest rate,
"There is no time or money spent on extending maturity dates or adjusting interest rates."
4. SAFE User Guide and Key Cautions
- Whether you're new to SAFEs or already familiar with them, YC strongly recommends reading the SAFE User Guide.
- The guide covers how SAFEs convert, example calculations, an explanation of the Pro Rata Side Letter, and practical tips.
5. Limitations of the SAFE and YC's Position
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While the SAFE is not a perfect fit for every situation,
"The terms of the SAFE are designed to balance the interests of both startups and investors."
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There is always a trade-off between simplicity and comprehensiveness.
"We don't address every edge case, but we believe the most important issues are sufficiently covered."
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YC helps hundreds of companies raise funding every year and has refined the SAFE based on extensive feedback.
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"YC is not responsible for the content or outcome of any version of the SAFE or any other document on this website. Please consult a qualified attorney in your jurisdiction before use."
6. Table of Contents and Additional Notes
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Table of Contents
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Additional Resources
- More materials related to the SAFE are available on the official YC website.
⭐️ Key Terms Summary
- SAFE (Simple Agreement for Future Equity)
- Pre-money SAFE / Post-money SAFE
- Valuation Cap
- Discount
- MFN (Most Favored Nation clause)
- Pro Rata Side Letter (preserving existing investor ownership)
- High Resolution Fundraising
- Dilution
- Reduced legal costs, fast execution
- Transparency, simplicity, flexibility
Closing Thoughts
The SAFE is an innovative tool that enables fast, transparent, and efficient early-stage investment agreements for both startups and investors. That said, it's not a one-size-fits-all solution — always consult a qualified professional and use it thoughtfully based on your specific situation! 🚀
Feel free to ask if you have any questions! 😊