The term "investor partnership agreement" is a myth; your legal relationship is defined by specific documents like SAFEs for early stages and a suite of agreements (SPA, IRA, Voting Agreement) for priced rounds. Mastering these terms is non-negotiable for protecting your equity and control. Investor quality is directly reflected in the documents they use—insist on standard forms like the YC Post-Money SAFE and NVCA model docs.
Key takeaways
- Never say "investor partnership agreement." Use the correct names for legal documents.
- For pre-seed, raise on post-money SAFEs. Avoid convertible notes with maturity dates.
- Model your cap table to understand dilution from SAFEs, the option pool, and the new round.
- In a priced round, insist on 1x non-participating liquidation preference.
- Reject non-standard legal documents; they are a major red flag about investor quality.
- Hire a top-tier startup lawyer. Do not use a generalist.
Let's get one thing straight: there is no standard legal document called an "Investor Partnership Agreement."
Using that phrase is the fastest way to signal that you're a first-time founder who hasn't done their homework. While you are building a partnership, the legal mechanics are handled by a specific set of documents. Knowing which ones to use—and how to negotiate them—is critical to protecting your ownership and control.
This guide breaks down the actual agreements that will define your relationship with investors, from your first pre-seed check to your Series A.
In the earliest stages (pre-seed and most seed rounds), the vast majority of startups raise money on convertible instruments. This means you don't set a firm price per share today. Instead, investors give you cash in exchange for the right to get equity in a future priced round. This is dramatically faster and cheaper than pricing a round, saving you tens of thousands in legal fees.
The SAFE, created and popularized by Y Combinator, is the undisputed standard for pre-seed funding in Silicon Valley and beyond. It's a simple, founder-friendly document where an investor purchases the right to future stock in your company.
Post-Money Valuation Cap: This is the most important term. It sets the maximum valuation at which the investor's money converts into equity. If you raise $500k on a SAFE with a $10M post-money cap, your investors are guaranteed to own at least 5% of the company ($500k / $10M) when the SAFE converts. If the next round's valuation is lower than the cap, they get an even better price, and thus more equity.
Discount: This gives the SAFE holder a discount on the price per share set in the next funding round. A typical discount is 15-20%. If a SAFE has both a cap and a discount, the investor gets whichever gives them a lower price per share (i.e., more ownership).
Example: You raise $200k on a post-money SAFE with a $12M cap and a 20% discount. A year later, you raise a Series A at a $20M pre-money…
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Frequently asked questions
- What's the difference between a pre-money and post-money SAFE?
- A post-money SAFE cap provides more certainty about your dilution. A $1M check on a $10M post-money cap means the investor buys 10% of the post-investment company. A pre-money cap's dilution depends on how many other SAFEs also convert, making it harder to predict.
- What is a typical valuation cap for a pre-seed round?
- It varies wildly, but as of late 2023/early 2024, typical pre-seed caps for US software startups range from $8M to $15M. Hotter deals in AI can command higher caps, while companies in less-hyped sectors might be lower.
- What are "protective provisions" in a Series A?
- They are veto rights granted to investors. Standard provisions protect them from major actions like selling the company without their consent. Overreaching provisions might give them a veto on your annual budget or executive hires—fight to keep those operational controls.
- Can I negotiate the terms of a SAFE?
- Yes, always. The valuation cap is the most commonly negotiated term. While some investors present their SAFE as "take-it-or-leave-it," you can and should negotiate the cap based on your leverage, traction, and market comparables.
