How to Review a SAFE Agreement: A Founder's Complete Checklist

What is a SAFE Agreement?

A SAFE (Simple Agreement for Future Equity) is a financing instrument that lets startups raise money from investors without setting a company valuation today. Instead of immediately issuing shares, the investor gives you cash now in exchange for the right to convert that investment into equity at a later date — typically your next priced round.

Y Combinator introduced the SAFE in 2013 as a cleaner alternative to convertible notes. Unlike a convertible note, a SAFE is not debt — there's no interest rate, no maturity date, and no repayment obligation if the company never raises again. For early-stage startups, this is usually founder-friendly.

But "simple" doesn't mean "harmless." A poorly negotiated SAFE can cost you 5–20% more equity than you expected when your priced round finally arrives. The conversion mechanics — caps, discounts, pro rata rights — interact in ways that aren't obvious until you model them out.

5 Key Terms to Check in Every SAFE

Every SAFE contains a handful of terms that determine how much of your company the investor ultimately owns. Here's what to look for.

1. Valuation Cap

The valuation cap is the maximum valuation at which the investor's SAFE converts into equity. If you raise a $15M Series A and the investor has a $5M cap, they convert as if the company is worth $5M — meaning they get 3x more shares than someone investing at the Series A price.

What to check: Is the cap on a pre-money or post-money basis? YC's post-2018 SAFE uses post-money caps, which are more dilutive to founders. A $5M post-money cap means the investor's ownership percentage is locked in at investment time: investment amount / cap valuation. Know which version you're signing.

2. Discount Rate

The discount gives the SAFE investor a percentage reduction on the price per share at the next priced round. A 20% discount means the investor pays $0.80 for every $1.00 share issued to new Series A investors.

What to check: When both a cap and a discount exist in the same SAFE, the investor converts using whichever gives them more shares (most favorable). This "most favorable" mechanic compounds dilution — model both paths before agreeing to the combination.

3. Pro Rata Rights

Pro rata rights give the SAFE investor the option (not obligation) to participate in future rounds to maintain their ownership percentage. A $100K investor who ends up owning 5% of your company can elect to invest their proportional share in your Series A to stay at 5%.

What to check: Is pro rata a right (optional) or a side letter obligation (sometimes can have teeth)? What's the threshold — major investors only, or does every $25K SAFE get it? Pro rata rights can crowd out new lead investors who want ownership concentration.

4. Most Favored Nation (MFN) Clause

An MFN clause means if you issue a future SAFE to another investor on better terms, the MFN holder automatically gets upgraded to those same terms. It's a self-updating protection for early investors.

What to check: MFN clauses in YC's standard SAFE only apply to subsequent SAFEs (not priced rounds). Still, if you're giving your first angel a $5M cap and later give a seed fund a $4M cap, your angel automatically converts at $4M. This can snowball unexpectedly if you're raising a rolling SAFE round.

5. Conversion Triggers

A conversion trigger defines what events cause the SAFE to convert into equity. Standard triggers are: (1) a priced equity round ("Equity Financing"), (2) a liquidity event (acquisition or IPO), and (3) dissolution of the company.

What to check: Some SAFEs add a "dissolution trigger" that requires repayment before common shareholders if the company shuts down. Review Section 1(c) carefully. Also confirm whether a down round with a lower valuation than the cap forces conversion — this is an edge case that creates complexity.

Common Red Flags That Cost Founders Equity

Most problematic SAFE terms don't look dangerous in isolation. They compound over time and across multiple instruments. Here are the patterns to watch for.

• Post-money cap without modeling the full SAFE stack. If you issue five SAFEs at a $5M post-money cap, each investor's ownership is calculated independently on the $5M cap. The aggregate dilution can be significantly higher than you'd expect from a single post-money calculation. Always model your entire SAFE stack, not individual instruments.
• No information rights clause. Many angel SAFEs omit information rights entirely. This is usually fine at seed, but institutional investors at Series A will ask how many SAFEs are outstanding and what their terms are. Keep a clean SAFE ledger from day one.
• Broad "company sale" definition in liquidity provisions. Some investor-friendly SAFEs define "liquidity event" to include asset sales above a low threshold (e.g., $500K). This means a minor acqui-hire triggers full conversion and payout before founders see anything. Check Section 1(b) closely.
• Cumulative pro rata across too many small checks. Issuing 15 SAFEs of $25K–$50K each, all with pro rata rights, creates a nightmare during Series A negotiations. Sophisticated lead investors will ask you to clean up the cap table. Set a minimum check size ($50K+) to get pro rata, or exclude it entirely for small angels.
• Non-standard SAFE templates with hidden investor protections. Some investors send their own "SAFE-like" documents that look similar but add provisions like interest accrual, conversion floors, or guaranteed return multipliers. If it's not a standard YC SAFE, have a lawyer review every clause.

How Cap Table Dilution Works with SAFEs (Simple Math)

Let's make this concrete. Most founders are surprised by how much dilution their SAFE stack creates when a priced round arrives.

The key insight: post-money SAFEs dilute from the fully diluted share count at Series A, not from your shares at the time of signing. This means the option pool top-up your Series A lead requires comes entirely out of existing shareholders — including the SAFE investors, who already have locked-in percentages.

For a deeper look at how your specific SAFE terms affect ownership, run your SAFE through Robaer's AI analyzer — it models the full conversion math against your terms in under 60 seconds. You can also compare standard structures in our SAFE templates library.

When to Use Each SAFE Variant

YC offers four standard SAFE variants. Choosing the wrong one is more common than founders realize.

For most pre-seed rounds, the post-money cap-only SAFE (no discount) is the cleanest choice. It's transparent, widely understood, and minimizes negotiation surface. Add a discount only if an investor specifically requires it and you've modeled the impact.

If you're unsure which variant an investor sent you, compare it against our standard templates — or upload it for an AI review that identifies the variant and flags non-standard clauses.

Checklist: 10 Things to Verify Before Signing a SAFE

Use this as a final pre-signing review. If you can't answer "yes" to each item, don't sign until you can.

• 1 Confirm the SAFE variant. Is it a standard YC SAFE (post-money cap, or cap + discount, or MFN)? Or a non-standard document? If non-standard, have a lawyer review it before signing.
• 2 Know your cap basis. Is the valuation cap pre-money or post-money? Post-money is now YC standard, but older SAFEs use pre-money. The math is different.
• 3 Model your full SAFE stack. List every SAFE you've issued, its investment amount, and its cap. Sum the ownership percentages. This is your total SAFE dilution before any priced round.
• 4 Understand the discount mechanics. If there's both a cap and a discount, confirm you've modeled both conversion paths and understand which produces more investor shares in likely Series A scenarios.
• 5 Check pro rata rights scope. Who has pro rata? Is it all SAFE holders or only those above a minimum check size? Can you reasonably service all pro rata at Series A without crowding out your lead?
• 6 Review MFN implications. If you have MFN holders and plan to issue more SAFEs, understand that future lower caps automatically apply to all MFN holders.
• 7 Confirm conversion triggers. What events cause conversion? Verify the "equity financing" minimum threshold — if it's too low, a small bridge round could inadvertently trigger conversion at unfavorable terms.
• 8 Check the dissolution provision. In a wind-down scenario, do SAFE investors get paid out before common shareholders? What's the priority order?
• 9 Verify state law and governing jurisdiction. Most SAFEs default to Delaware law. If yours specifies a different jurisdiction, confirm your lawyers are familiar with that state's treatment of equity instruments.
• 10 Get a second review. Have your SAFE reviewed by either a startup lawyer or an AI analysis tool before signing. Clause ambiguity costs founders equity later. This is not the place to save $300 on legal review.

For more context on the standard SAFE templates, visit our Templates Library to compare YC SAFE variants side by side. And when you're ready to understand pricing for ongoing SAFE management and review, see our pricing page.