SAFE Agreement Generator: Issue YC-Standard SAFEs With Confidence
The SAFE is the most founder-friendly fundraising instrument ever invented. It is also the one most founders issue without fully understanding the terms they are agreeing to.
A SAFE — Simple Agreement for Future Equity — is a contractual right to receive equity in a future priced round in exchange for investment made today. No maturity date. No interest rate. No valuation required at closing. Legal Chain generates YC-standard post-money SAFEs in all four variants — cap only, cap with discount, discount only, and MFN — with blockchain-anchored execution for every executed instrument. Try it free today.
More than 80 percent of Y Combinator-backed companies raise their pre-seed capital using SAFE agreements. The instrument’s simplicity is its greatest strength — and the reason founders sometimes issue SAFEs without fully understanding the dilution mathematics. Photo: Unsplash / Mimi Thian
What a SAFE Is and Why It Became the Standard
Y Combinator introduced the Simple Agreement for Future Equity in 2013 to address a specific problem: the convertible note, the existing instrument for early-stage fundraising, was a debt instrument with a maturity date, an interest rate, and balance sheet implications that made it unnecessarily complicated for a $25,000 pre-seed check.
The SAFE solved all three problems simultaneously. It has no maturity date — it does not expire and does not need to be repaid. It accrues no interest — the investor’s return comes entirely from equity at conversion. It is not debt — it does not appear as a liability on the company’s balance sheet. The investor provides capital today and receives a contractual right to equity in a future priced round, at terms set by the SAFE’s economic provisions.
YC updated the standard SAFE templates in 2018 to switch from a pre-money to a post-money valuation cap structure. The post-money cap gives investors a clearer picture of their expected ownership percentage at the time they invest, rather than discovering it only after the priced round closes. Today, the post-money SAFE with valuation cap is the most widely used pre-seed and seed fundraising instrument in the US startup ecosystem.
The Four SAFE Variants
Converts at the lower of the cap conversion price or the priced-round price. No additional discount on top of the cap. The investor’s ownership percentage at conversion is determined by the cap valuation relative to the SAFE amount invested.
Best for: most pre-seed and seed rounds. Cleanest economics. Most widely accepted by angel investors and seed funds.
Converts at the lower of the cap conversion price or the priced-round price multiplied by the discount rate (typically 80-85 cents per dollar). Provides dual protection: the cap if the company’s valuation grows substantially, and the discount if the priced-round valuation is near the cap.
Best for: larger SAFE amounts or investors who want additional downside protection alongside the cap.
Converts at the priced-round price multiplied by the discount rate. No valuation cap. Used when a cap cannot be agreed upon but both parties want some investor protection at conversion. Less protective for investors than cap-based SAFEs if the company’s valuation grows substantially.
Best for: situations where parties cannot agree on a valuation cap but still want to close the investment quickly.
No cap, no discount. The investor receives the right to adopt the terms of any future SAFE issued on better terms before the qualifying financing closes. Most favored nation protection only. Provides the minimum investor protection of any SAFE variant.
Best for: early strategic investors or advisors where relationship value is the primary consideration and economics are secondary.
The Mathematics Every Founder Must Understand
The post-money SAFE cap determines the investor’s expected ownership percentage at the time of investment — not at the time of conversion. Understanding the calculation is essential before issuing any SAFE.
The critical insight from post-money SAFEs is that the ownership percentage is determined at closing, not at conversion. When a founder issues $500,000 of SAFEs at a $5M cap, they are committing 10 percent of the company before the first priced round closes. If they subsequently issue another $250,000 of SAFEs at the same cap, that is another 5 percent. The cumulative dilution from SAFE rounds compounds before the Series A even prices.
Furthermore, the SAFE amount dilutes the existing shareholders, not the Series A investors. The Series A investors price their investment on the post-money cap table — which includes the SAFE holders as fully diluted shareholders. The founders and existing shareholders absorb the SAFE dilution. This is the most important mathematical fact about post-money SAFEs that founders frequently learn only after closing their Series A.
The post-money SAFE means the SAFE amount is already dilutive the moment it closes. Every $100K at a $5M cap is 2 percent of the company, committed before any priced round. Stacking SAFEs compounds before the Series A prices. Photo: Unsplash / Scott Graham
SAFE vs. Convertible Note: The Practical Comparison
Key SAFE Terms Explained
The maximum valuation at which the SAFE converts into equity. If the priced round values the company above the cap, the SAFE investor converts as if the valuation were the cap — receiving more shares per dollar invested than priced-round investors. Protects early investors from the risk that the company’s valuation grows significantly before their investment converts.
The percentage below the priced-round price at which the SAFE converts. A 20 percent discount means the SAFE investor converts at 80 cents for every dollar of priced-round share price. Provides a fixed reward for early investment regardless of how much the company’s valuation changes before the priced round.
The future equity financing event that triggers SAFE conversion. Typically defined as a preferred stock financing above a minimum amount — often $1M or $2M — that is the company’s next priced round of funding. The definition of qualifying financing determines when the SAFE converts and is one of the most negotiated terms in non-standard SAFEs.
The SAFE investor’s right to participate in the qualifying financing and future financing rounds on a pro rata basis — maintaining their ownership percentage by purchasing new shares rather than being diluted. Pro rata rights are optional provisions not included in the standard YC SAFE but frequently negotiated by larger SAFE investors.
A provision giving the SAFE investor the right to adopt the terms of any future SAFE issued with better terms before the qualifying financing closes. Protects early SAFE investors from the company issuing subsequent SAFEs at a lower cap, which would give later investors a better economic deal for the same risk profile.
“The SAFE’s simplicity is not the same as the SAFE’s ease. The document is short. The economics are compounding. Every founder should be able to calculate, before signing any SAFE, exactly what ownership percentage they are committing to each investor — and what the cap table looks like after all outstanding SAFEs are included.”
How Legal Chain’s SAFE Generator Works
Post-money cap only, post-money cap with discount, discount only, or MFN only. Legal Chain explains the economic implications of each variant before generating, so founders understand what they are issuing rather than selecting terms without context.
Investment amount, post-money valuation cap (if applicable), and discount rate (if applicable). Legal Chain calculates and displays the expected ownership percentage at the cap before generating the document, so the founder sees the dilution implications before the SAFE is signed.
Company legal name, state of incorporation, and investor name and entity type. Legal Chain generates the YC-standard signature pages and the cover page consistent with current YC SAFE template formatting. The document structure follows YC’s standard SAFE format, which is universally recognized by US seed investors and legal counsel.
Both parties sign the executed SAFE. The Trust Layer anchors the executed instrument to Ethereum via SHA-256 fingerprinting. The SAFE becomes permanently verifiable — which matters when the executed instrument is produced at Series A due diligence alongside the cap table and corporate records.
SAFEs with non-standard terms — pro rata rights, side letters, information rights, or provisions that deviate materially from the YC standard template — require attorney review. Legal Chain’s Global Lawyer Finder connects founders with corporate attorneys specializing in early-stage financing in their jurisdiction. Legal Chain is software, not a law firm. Legal Chain currently supports US jurisdictions.
Generate a YC-standard SAFE in under five minutes. Free.
All four variants. Post-money ownership calculation before you sign. Blockchain-anchored after execution. No credit card required.
Try Legal Chain TodayFrequently Asked Questions
What is a SAFE agreement?
A Simple Agreement for Future Equity is a contractual right to receive equity in a future priced funding round in exchange for investment made today. No maturity date. No interest rate. Not debt. The investor provides capital now; the company issues equity at the qualifying financing at terms set by the SAFE’s valuation cap and discount rate. Created by Y Combinator in 2013. Updated to post-money valuation cap structure in 2018. The most widely used pre-seed fundraising instrument in the US startup ecosystem.
What is the difference between a SAFE and a convertible note?
A convertible note is debt with a maturity date, interest rate, and balance sheet liability. A SAFE is an equity contract with none of those three characteristics. For most early-stage US companies, SAFEs are simpler, cheaper to document, and less burdensome than convertible notes. Convertible notes are more common with institutional lenders and non-US investors less familiar with the SAFE structure.
What is a valuation cap in a SAFE?
The maximum company valuation at which the SAFE converts into equity. If the priced round prices above the cap, the SAFE investor converts as if the valuation were the cap — receiving more shares per dollar than priced-round investors. In a post-money SAFE at a $5M cap with $100K invested, the expected ownership is 2 percent. This percentage is determined at closing, not at conversion — making the dilution commitment immediate, not deferred.
What are the four types of YC SAFE templates?
Post-money cap only (most common — cleanest economics, widely accepted); post-money cap with discount (dual protection — cap and discount); discount only, no cap (used when parties cannot agree on a cap); and MFN only (minimum investor protection — the investor adopts terms of any future SAFE issued on better terms). Legal Chain generates all four. Try it at legalcha.in/beta.
Disclaimer
This article is published for general informational purposes only and does not constitute legal advice or investment advice. SAFE agreements are legal instruments with significant economic and equity consequences. Legal Chain is a technology platform and is not a law firm. Use of Legal Chain does not create an attorney-client relationship. For SAFEs with non-standard terms, complex cap tables, or large investment amounts, consult a licensed corporate attorney. The SAFE template used as a basis for Legal Chain’s generator is based on publicly available YC standard templates; founders should confirm current YC template versions before issuing any SAFE. Legal Chain currently supports US jurisdictions only.
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