SAFEs, Convertible Notes, and Priced Rounds: A Primer on How Startups Raise Early Money

Sooner or later, most startups need financing to really scale. While the startup-community probably doesn’t give enough attention to true bootstrappers (yes, it is possible to build a business from the ground up), there are real reasons why venture capital is an important aspect of building a business, particularly in tech.

This is a primer on the most common finance vehicles that early-stage founders will likely see. We’ll talk about what each structure is, how its main terms work, and when you are most likely to encounter it and some common concerns or pitfalls. None of these instruments are inherently good or bad. Each fits a different stage and a different kind of investor.

The SAFE

A SAFE, short for Simple Agreement for Future Equity, is an agreement to give an investor equity later, when you do a priced round, in exchange for cash now. It is not debt. It carries no interest and no maturity date. Y Combinator introduced the SAFE in 2013 and released the post-money version in 2018, which is now the market standard. It is important to note that a true SAFE note is not negotiable. That’s partially the point. That’s why it is a “Simple Agreement.” An industry standard was established, and its terms are not to be changed.

A SAFE does not set a valuation today. It sets the terms for converting later, usually through two numbers. The valuation cap is the highest company value at which the money converts into shares, which rewards the investor if the company grows. The discount lets the investor convert at a set percentage below what priced-round investors pay, often in the 10 to 25 percent range. Many SAFEs include both, and the investor gets whichever produces more shares. In a post-money SAFE, the investor's ownership percentage is fixed and knowable at signing, calculated as the investment divided by the post-money cap.

SAFE Notes are common for very early, friend-and-family investors or angel investors. Accelerators like Y Combinator use them, and most seed rounds today are papered this way because a SAFE is short, inexpensive, and quick to close.

That said, remember that SAFEs notes are securities and are therefore subject to SEC regulation. Investors like to skip this part, but if you are going to take your business seriously, and treat it as if it were the multi-million dollar asset that you claim it is, you need to take the ramifications of this seriously.

Is the SEC going to knock down your door and bring you out in handcuffs because you didn’t register your uncle’s SAFE note? No, of course not. But failing to handle the details of registering your securities and providing the proper disclosures can result in complications at exit, and can increase the possibility of an investor claiming fraud. So cheap to avoid. So expensive to defend.

The convertible note

A convertible note was the default investment vehicle before SAFEs came along. It’s the same basic idea as a SAFE, with a key difference. Here an investor wants to invest, but we aren’t yet sure how to value an early-stage startup. So the convertible note punts on the question of valuation like a SAFE, but also operates as a loan. It is debt that converts into equity at a later priced round, and until it converts it accrues interest, which usually turns into additional shares rather than getting repaid in cash. Like a SAFE, a note typically carries a valuation cap, a discount, or both. Unlike a SAFE, it has a maturity date, the day the loan technically comes due.

That maturity date is the main practical difference. If you have not raised a priced round by the time the note matures, the investor can, in principle, demand repayment or use the deadline as leverage to renegotiate. A SAFE has no such trigger.

SAFEs are generally more favorable to founders. Convertible Notes are generally more favorable to investors. They can show up in seed and bridge financings, and with angels or funds who simply prefer holding debt or want the stronger position debt provides if the company winds down, since debt sits ahead of equity in any distribution. Notes were once the standard early instrument and have largely, though not entirely, given way to SAFEs.

The Priced Round (Series A, B, C, etc.)

In a priced round, you and your investors agree on a company valuation, set a price per share, and sell actual preferred stock, typically a Series Seed or Series A. Nothing waits to convert. Everyone knows who owns what the day the round closes.

The tradeoff is cost and complexity. A priced round runs on a full set of deal documents, often based on the NVCA or Series Seed model forms, covering the stock purchase, a charter amendment, investor rights, and voting arrangements. It can include a board seat and investor consent rights over major company decisions. You will also generally need a 409A valuation to set the fair market value of your common stock and grant options correctly.

Priced rounds arrive when the raise is large enough to justify the legal cost, when an institutional lead wants the governance rights that come with preferred stock, or when a company has raised on a series of SAFEs and notes and needs to convert them and clean up the cap table.

Side Letters

A side letter is a separate agreement that gives a specific investor rights not written into the main instrument. Common terms include a most-favored-nation clause, which lets the investor claim any better terms you later give someone else, pro rata rights to keep their ownership percentage in future rounds, information rights to receive financial updates, and sometimes a board observer seat. Post-money SAFEs, for example, do not include pro rata rights by default, so investors who want them ask for a side letter.

When you encounter it: side letters usually accompany a larger or more strategic check, in any of the three structures above. They are worth watching for two reasons. A most-favored-nation clause can quietly cascade, resetting an earlier investor's deal to match a better one you offer later. And a stack of inconsistent side letters becomes an administrative and compliance burden that surfaces, unhelpfully, during diligence. Keep track of every promise you make outside the main documents.

How SAFEs and Convertible Notes actually Convert

Because SAFEs and Convertible Notes convert later, their cost is easy to underestimate at signing. A simplified example shows why. If you raise $1 million on a post-money SAFE with a $10 million post-money cap, that investor ends up with roughly 10 percent of the company. Raise a second $1 million on another SAFE at the same cap, and you have committed close to 20 percent before a priced-round investor puts in a dollar, with that dilution borne by the founders. The priced round and any option pool top-up then come on top.

This is simplified and ignores the option pool and differing caps. The takeaway is that every SAFE and note is dilution already agreed to. It just does not appear until conversion, so model the fully diluted cap table before signing the next instrument.

SEC Compliance: every one of these is a securities sale

A SAFE, a convertible note, and priced-round stock are all securities. Selling them requires either registration with the SEC, which early startups do not do, or an exemption. The common exemption is Regulation D under the Securities Act. Two paths matter for most startups. Rule 506(b) lets you raise an unlimited amount from accredited investors, plus up to 35 non-accredited but sophisticated investors, as long as you do not engage in general solicitation. Rule 506(c) permits general solicitation, advertising the raise publicly, but every investor must be accredited and you must take reasonable steps to verify it, not just accept their word.

After your first sale, you file a Form D with the SEC, generally within 15 days. The accredited-investor definition and the specific rule you rely on should be confirmed for your facts. Don’t forget that many states also have blue sky laws to comply with.

Two more things to consider: First, the antifraud rules apply no matter which exemption you use. You cannot misstate or omit material facts to an investor even in a casual friends-and-family SAFE. Second, if you bring in any non-accredited investors under Rule 506(b), you trigger specific disclosure obligations. This is one reason we already recommend a private placement memo be included in the deal.

What’s a private placement memo and do I need one?

A private placement memorandum, or PPM, is a disclosure document describing the company, the terms of the offering, and the risks of investing. Our general view is that for an early raise from accredited investors on a SAFE or convertible note, a detailed, 60 page, intricate PPM disclosing every possible risk, issue, development, and piece of analysis is usually unnecessary and not worth the cost. However, a straightforward, simple disclosure regarding the risks of investment is easy to produce, and can save a lot of headaches later if litigation ever follows.

For accredited investors, a disclosure like a PPM is optional. However, if you accept non-accredited investors (which I’d rather you didn’t) under Rule 506(b), disclosure is no longer optional. If you use general solicitations, raise a larger or more public round, or take money from less sophisticated investors (which often includes friends and family), a more robust written set of risk factors and disclosures is worth preparing.

We typically recommend a PPM in all cases, although the depth and complexity of the disclosure depends on who is investing and how you are reaching them, so it is worth a specific conversation rather than a default assumption in either direction.

The Recap

SAFEs dominate the earliest money, notes appear when an investor wants debt or a bridge, and priced rounds arrive with larger and more institutional capital. Side letters ride alongside all three and deserve close tracking. Whichever structure you use, it is a securities sale governed by Regulation D and state blue sky laws, the antifraud rules always apply, and the PPM is a judgment call driven by who is investing. Understanding these building blocks before you raise makes every conversation with an investor, and every later diligence review, go more smoothly.

This post is general information, not legal advice, and does not create an attorney-client relationship. Securities and tax rules are fact-specific and change. Talk to counsel about your situation.