You have an investor ready to write a check, but you do not have a clean way to price your company yet. Setting a valuation this early feels like a guess, and a full priced round means lawyers and weeks of delay. This is the exact spot a safe note was built for.

A safe note lets you take money now and sort out the equity later, with very little paperwork. It has become one of the most common ways founders raise their first dollars. Here is how it works and when it is the right choice.

What a SAFE Note Is

A SAFE note, short for Simple Agreement for Future Equity, is a contract that gives an investor the right to receive equity in your company at a future date, usually when you raise a priced round. Y Combinator introduced the safe in 2013 to make early fundraising faster and simpler.

The key word is “future.” The investor gives you money today, but the shares are issued later, once your company has a real price.

A safe is not a loan and it is not stock. It is a promise to convert that cash into equity when a triggering event happens, such as your next financing round.

How a SAFE Note Works

The mechanics are simpler than they sound. An investor signs the safe and wires you the money, often within days.

That money sits as an open agreement until a conversion event occurs. The most common trigger is a priced equity round, like a Series A.

When that round closes, the safe converts into shares. The terms written into the safe decide how many shares the investor gets and at what price.

Because there is no interest and no due date, the safe just waits patiently until conversion. This is a big part of why founders like it.

Valuation Cap vs. Discount

The two terms that shape a safe most are the valuation cap and the discount. They both reward early investors for taking a risk before anyone else.

A valuation cap is a ceiling on the price the safe converts at, so the investor gets a better deal if your company grows in value before the next round. If your cap is set lower than your eventual round valuation, the early investor effectively buys shares at the lower number.

A discount is a percentage off the price that new investors pay in the priced round. A 20 percent discount means the safe holder pays 80 cents for every dollar of share price the new investors pay.

Some safes use only a cap, some use only a discount, and some use both. According to Carta data covering January through September 2024, about 62 percent of safes used a valuation cap alone, while roughly 29 percent combined a cap with a discount.

Pre-Money vs. Post-Money SAFE

There are two main versions of the safe, and the difference matters a lot for your ownership. The original 2013 version was a pre-money safe.

Y Combinator released the post-money safe in 2018, and it is now the standard. The names refer to whether the safe itself is counted in the valuation cap calculation.

For a fuller explanation, see our guide on the difference between pre-money and post-money valuation.

With a post-money safe, the safe is included in the cap math, so you can see exactly how much of your company you are giving away at the moment you sign. That clarity is the main reason it replaced the older form.

With a pre-money safe, the safes were excluded from the calculation. Founders often signed several and only later discovered they had given away more than they thought once everything converted at once.

The trade-off is that the post-money safe gives investors a fixed ownership percentage, so any future safes you raise dilute you, not them. Knowing this up front helps you plan your raise.

SAFE Note vs. Convertible Note

Before safes, the convertible note was the standard tool for early fundraising. The two look similar, but one key difference sets them apart.

A convertible note is a form of debt. It carries an interest rate and a maturity date, which is a deadline by which it must convert or be repaid.

A safe is not debt at all. It has no interest and no maturity date, so there is no clock ticking and no balance to repay if a priced round takes longer than expected.

This makes safes lighter and friendlier to founders, which is why they now dominate early-stage deals. Some investors still prefer notes because the maturity date and interest give them more power at the table, so you may see both depending on who is involved.

Pros and Cons of a SAFE Note

The biggest advantage is speed and cost. A safe is a short, standardized document, so you can often close in days with minimal legal expense.

It also delays the hard question of valuation until your company has more traction to justify a number. And with no interest or maturity date, there is no pressure of a looming deadline.

The downside is that dilution can sneak up on you. Each safe you sign is a promise of future equity, and those promises add up at conversion.

Another risk is stacking many safes with different caps. When they all convert at once, the combined effect on your ownership can be larger than you expected, so you need to track them carefully.

When to Use a SAFE Note

A safe shines at the earliest stages, when your company is too young to price with confidence. Pre-seed and seed rounds are the classic use cases.

It works well when you want to raise from a few angels or a small fund without the overhead of a priced round. It is also useful when you want to take money on a rolling basis as investors say yes, rather than closing everyone at the same time.

Many accelerators invest through safes for these same reasons. Elev X!, the startup accelerator program run by NEC X in Palo Alto, invests $250K through a SAFE for up to 11 percent equity over a 9 to 12 month program, which is a clean example of how the instrument works in practice. If you are building a company and want that kind of backing, you can apply to Elev X!.

A safe is less ideal once you are ready for a true priced round with a lead investor setting terms. At that point, issuing actual preferred stock is usually the better path.

Understanding Dilution

Dilution simply means your slice of the company gets smaller as you issue more equity. Every safe you sign represents a future slice, even though the shares have not been created yet.

The danger is that safes are easy to sign, so founders sometimes raise more than they realize. Each one looks small on its own, but together they can hand over a large chunk at conversion.

Use a simple cap table or a safe calculator to model what happens when everything converts. Seeing the combined effect before you sign keeps you in control of your ownership.

Learn more in our guide on how to read, build, and manage a cap table.

Frequently Asked Questions

Is a SAFE note debt?

No. A safe is not a loan, so it has no interest rate and no maturity date. It is a contract that converts into equity later, which is what makes it simpler than a convertible note.

When does a SAFE note convert into equity?

A safe usually converts during your next priced equity round, such as a Series A. It can also convert in events like an acquisition, depending on the terms. Until a triggering event happens, the safe just stays open.

What happens if my startup never raises a priced round?

If no conversion event ever occurs, the safe may simply never convert, since it has no maturity date forcing repayment. In an acquisition or shutdown, the safe terms spell out what the investor receives. This is one reason investors review the conversion terms carefully.

Should I use a cap, a discount, or both?

It depends on what you and your investor negotiate. A cap protects the investor if your value rises sharply, while a discount rewards them for investing early. Many founders use only a cap because it is the most common and the easiest to explain.

Sources

YC Safe Financing Documents – Y Combinator

SAFE Note (Y Combinator) – Wall Street Prep

What Is a SAFE Note? Mechanics, Caps and Dilution – Waveup

SAFE vs Convertible Note – The Startup Law Blog

State of Pre-Seed: 2024 in review – Carta

We do our best to ensure accuracy, but if you spot an error, please let us know at pr@nec-x.com.