Pre-money vs. post-money SAFEs: A founder’s guide

SAFEs (Simple Agreement for Future Equity) are a popular type of convertible security that allow you to complete a funding round quickly with less paperwork and negotiation than issuing shares. SAFEs were designed as a simpler, equity-based alternative to convertible notes, and their dominance in the early-stage market is clear. In the first quarter of 2025, SAFEs comprised a record high of 90% of all pre-seed rounds on Carta.

But for many founders, understanding how SAFEs work can be overwhelming—especially when it comes to the differences between pre-money and post-money SAFEs. Understanding these differences can help you fundraise with confidence.

Pre-money vs. post-money SAFEs

One of the biggest mistakes early-stage startup founders make is assuming that pre-money and post-money SAFEs are interchangeable. When negotiating with investors, they focus on details like valuation caps and conversion discounts first, and then let their investors decide whether the SAFE is going to be pre-money or post-money.

The core difference between pre-money and post-money SAFEs really comes down to dilution—specifically, whose slice of the pie gets smaller because of other SAFE investments happening before the SAFEs are converted.

With a post-money SAFE, the investor’s ownership percentage is fixed relative to other SAFEs, meaning new SAFE investors only cause share dilution for the founders or other stockholders. With a pre-money SAFE, all SAFE investors in the round dilute each other as well as the founders, making the final ownership percentage uncertain until a future priced round.

As a result, the decision to use a pre-money or post-money SAFE can have a real impact on your equity ownership percentage and share dilution over time. That’s why it’s smart to reverse the order of the discussion: Talk with your investors and decide whether you’ll use pre-money or post-money SAFEs before you fundraise, and then discuss other details like valuation caps and conversion discounts.

Understanding this difference is one of the most important parts of early-stage fundraising. To make it clearer, let's compare them side-by-side.

To understand this table, let's see how the math works in practice and walk through an example for each type of SAFE.

The SAFE Fundraising 101 eBook

Your essential guide to understanding how SAFEs work in fundraising.

Download our free guide

How a pre-money SAFE works

Say you’re raising a seed round. You accept money from several investors through SAFE agreements. This means you’re not giving those investors any shares of your company yet, because your company doesn’t have an official valuation.

What you’re giving your investors is a promise that they’ll receive shares at a later date. Typically, this happens when you raise your first priced round (like a Series A), and convert their SAFE investments into shares.

With a pre-money SAFE, an investor’s ownership is a floating percentage that only becomes fixed when the SAFE conversion happens. This typically occurs during a future priced round, like a Series A, where you sell shares at a set price per share.

The conversion price for the investor's shares is calculated based on the company's capitalization before any of the new SAFE investments are included. This is the critical detail. Because the calculation doesn't account for other SAFEs, all the SAFE holders in that round end up diluting one another, in addition to diluting you and your co-founders.

A key term in any SAFE is the valuation cap. This is the maximum valuation at which the investment will convert to equity. It acts as a ceiling that protects your early investors by giving them a better price per share if your company's valuation soars in the next equity financing round.

Pre-money SAFEs: The investor’s perspective

Let’s pretend for a moment that you’re one of those investors.

Right now there’s a good deal of uncertainty in your life. You know you’ll receive shares of this company at some point in the future, but how can you assess what percentage of the company you own compared to the founding team and all the other SAFE investors in this round?

Unfortunately, with a pre-money SAFE, there’s no way to know (yet).

The only way to learn how your ownership percentage compares to the founders and other SAFE investors is to wait and see how the math plays out in the future, when the company raises its first priced round. When that happens, and the Series A funds hit the company’s bank account, it will cause your SAFE agreement to convert into shares, along with all the other SAFE agreements. At that time, each of the various SAFEs will mathematically affect each other—and when the dust settles, everyone will finally know exactly what percentage of the company they own.

In other words: With a pre-money SAFE, founders and investors have to wait and see how their ownership percentage compares with the other investors in a future round. This is the key difference between pre-money SAFEs and post-money SAFEs.

Pre-money SAFE conversion example

Let’s imagine a startup, FounderCo. The founders own all eight million shares. They decide to raise money using pre-money SAFEs.

• Investor A invests $500,000 on a pre-money SAFE with a $10 million valuation cap.

• Investor B invests $500,000 on a pre-money SAFE with a $10 million valuation cap.

A year later, FounderCo raises a Series A priced round. The new lead investor agrees to a $15 million pre-money valuation and invests $3 million. As part of the deal, the company also creates a new employee option pool equal to two million shares—a standard move, as startups typically reserve 13% to 20% for options.

Here’s how the pre-money SAFEs convert. The valuation cap of $10 million is lower than the Series A pre-money valuation of $15 million, so the SAFEs will convert at the $10 million cap. The conversion price is the valuation cap divided by the company capitalization before the SAFEs convert.

• Company capitalization (pre-SAFE): 8,000,000 (founder shares) + 2,000,000 (new option pool) = 10,000,000 shares

• SAFE conversion price: $10,000,000 (valuation cap) / 10,000,000 (shares) = $1.00 per share

• Investor A shares: $500,000 / $1.00 = 500,000 shares

• Investor B shares: $500,000 / $1.00 = 500,000 shares

Now, let's look at the final cap table after the Series A investor's money is in.

In this scenario, the founders end up with just over 59% of the company.

How a post-money SAFE works

A post-money SAFE works differently and provides the investor with immediate clarity on their ownership stake. With a post-money SAFE, an investor gives you money and effectively locks in the percentage of your company they’ll own when you convert their SAFE to shares.The term "post-money" means the valuation cap includes the new investment money.

With a post-money SAFE, the investor's ownership is calculated using the post-money valuation cap. The calculation for company capitalization includes the shares issued in connection with the conversion of all SAFEs. This is a major difference from the pre-money SAFE.

• Investor certainty: The investor knows their ownership percentage relative to the company and other SAFE investors right away.

• No mutual dilution: Because each post-money SAFE is included in the definition of company capitalization, investors in the same SAFE round do not dilute each other.

• Founder dilution: Each new post-money SAFE that is issued dilutes the founders and any existing shareholders.

Post-money SAFE conversion example

Let’s use the exact same scenario for FounderCo to see the difference. The founders own eight million shares and raise the same amounts from the same investors on SAFEs with a $10 million valuation cap, but this time they are post-money SAFEs.

• Investor A invests $500,000 on a post-money SAFE with a $10 million valuation cap.

• Investor B invests $500,000 on a post-money SAFE with a $10 million valuation cap.

The Series A round is identical: a $15 million pre-money valuation, a $3 million investment, and a new two million-share option pool.

With post-money SAFEs, the conversion math is different. Each SAFE investor’s ownership is calculated based on their investment amount divided by the post-money valuation cap.

• Investor A Ownership: $500,000 / $10,000,000 = 5%

• Investor B Ownership: $500,000 / $10,000,000 = 5%

The total ownership for SAFE investors is 10%. This means the founders and the new option pool together will own 90% of the company before the Series A investment.

• Pre-Series A shares (founders + option pool): 8,000,000 + 2,000,000 = 10,000,000 shares

• Total pre-Series A company shares: 10,000,000 / (1 – 0.10) = 11,111,111 shares

• SAFE Investor Shares: 11,111,111 – 10,000,000 = 1,111,111 shares

Now, let’s look at the final cap table after the Series A investor’s money is in.

In this scenario, the founders end up with 60% of the company.

The catch with post-money SAFEs

As a founder, post-money SAFEs put you at greater risk of having your ownership percentage diluted in the future, when you raise your first priced round.

By using a post-money SAFE, you’re establishing more defined ownership percentages for each investor with a post-money SAFE: When you raise your Series A and convert all your SAFE agreements to shares, you will bear more of the dilution than with pre-money SAFEs.

This means that when the Series A begins, none of the SAFE investors will dilute each other’s ownership percentages. Instead, they’ll only dilute the ownership that you, the founder, still retain after the Series A.

Why are post-money SAFEs the standard?

The startup ecosystem has largely shifted to the post-money SAFE, which quickly became the market standard for early-stage fundraising because while it doesn’t give them total certainty, it does give them more certainty than a pre-money SAFE.

The rise of post-money SAFEs has been dramatic; in the third quarter of 2024, 87% of all SAFEs were post-money. This represents a major change from the start of the 2020s, when that figure was just 43%.

This shift was solidified when Y Combinator, the creator of the SAFE, updated its standard templates to the post-money version. Because YC is so influential, the post-money SAFE quickly became the market standard, especially in a fundraising environment where a rising capital demand/supply index highlights the chasm between company needs and investor willingness to invest.

From a founder-advocate perspective, while the post-money SAFE gives investors certainty, it also makes negotiations more transparent for you. Y Combinator itself calls this a “huge advantage” for both parties, as it allows everyone to “calculate immediately and precisely how much ownership of the company has been sold.” You know exactly how much of your company you are selling with each SAFE financing agreement, which removes ambiguity from the fundraising process.

How to model your SAFE dilution

As a founder, one of the most stressful parts of fundraising is the fear of giving away too much of your startup equity. According to recent founder ownership data, after a seed round, the median founding team owns just 56.2% of their company. That figure drops to 36.1% at Series A, and by Series B, founders collectively own only 23%.

As discussed during Carta’s Startup Fundraising 101 webinar, you need to learn what a SAFE could mean for you. Before you even start raising, you need to know the implication of those SAFEs once a priced round comes along. Instead of getting lost in spreadsheets, you can use tools to model the dilution from your SAFE round.

Use Carta's free SAFE calculator to see how a SAFE will convert. As your fundraising plans get more complex, you can use Scenario Modeling on the Carta platform to forecast the full dilution impact of multiple SAFEs, a priced round, and even a new employee option pool, all in one place. This helps you generate a pro forma cap table, make informed decisions, and negotiate with confidence.

Free SAFEs and convertible notes calculator

Plan ahead for your next fundraising round with this SAFE and convertible note calculator.

Get started

Choosing the right SAFE for your startup

Since the post-money SAFE is the industry standard, your goal shouldn't be to fight it. Instead, you should focus on negotiating the valuation cap wisely to reflect your company's fair value. Think strategically about your fundraising.

First, determine the amount of capital you need to reach your next set of milestones. Then, model the dilution to understand what valuation cap you can accept while retaining a healthy ownership stake for you, your team, and any advisors who hold advisory shares.

As Amber Allen, founder of Double A Labs, says, this can even become part of your strategy. “Raising capital with SAFEs through Carta was a breeze,” says Amber. “I love the granularity offered within the platform, like having the option for each individual SAFE to be invested at a pre- or post-money valuation. I incorporated that into my fundraising strategy by offering partners better terms if their check size hit a larger threshold and was able to secure $3.5 million for our friends and family round in under six weeks.”

Getting your equity management right from the beginning is foundational to your company's future and can have major tax implications. Starting with a platform that offers professional-grade tools for private corporations makes all the difference.

With Carta Launch, you can set up your cap table, issue your first SAFEs, and manage your ownership accurately from day one, for free. It replaces the spreadsheet chaos that leads to costly errors and gives you the same tools trusted by top startups.

Get started for free and see how you can manage your equity with confidence.

The easiest way to issue SAFEs

Create agreements, collect signatures, and receive funding—all through one connected platform.

Learn more

Frequently asked questions about pre-money and post-money SAFEs

Can I issue both pre-money and post-money SAFEs in the same round?

While technically possible, it's not recommended. Mixing SAFE types creates significant complexity and potential for disputes when calculating conversions, which can make your cap table messy and confuse investors.

What happens if my priced round valuation is lower than my SAFE's valuation cap?

The valuation cap is a ceiling, not a floor. If your priced round valuation is lower than the cap, the SAFE will convert at that lower valuation, which is more favorable to the investor and may interact with other terms like liquidation preferences in a future exit.

Does a post-money SAFE mean my ownership is completely fixed?

No, it fixes the investor's ownership before the new priced round, but their stake will still be diluted by the new investors in that priced round, just like yours. The certainty it provides is relative to other SAFEs, not future funding rounds, which will have their own terms.