What is a Post-Money Safe?

Fundraising involves a massive amount of jargon. You are trying to build a company while navigating a maze of legal terms that seem designed to confuse you. If you are raising a pre-seed or seed round, you will likely encounter the SAFE.

SAFE stands for Simple Agreement for Future Equity. It was created by Y Combinator to replace convertible notes. It allows you to take money now and give equity later when you raise a priced round.

However, there are different versions. The most common standard today is the Post-Money SAFE.

This agreement sets the valuation cap to be measured after the new money is invested. This is a distinct change from previous versions and it drastically alters how you calculate ownership.

The math behind the Post-Money SAFE is actually designed to be simpler than its predecessors. That is the main selling point.

With a Post-Money SAFE, the investor’s ownership is determined immediately based on the amount they invest and the valuation cap.

The formula looks like this:

• Investment Amount divided by Post-Money Valuation Cap equals Investor Ownership Percentage.

For example, if an investor puts in 1 million dollars on a 10 million dollar Post-Money Valuation Cap, they own exactly 10 percent of the company immediately before the next priced round.

There is no ambiguity. You know exactly how much of the company you just sold.

To understand why this matters, you have to look at the older version. The original SAFE was usually Pre-Money.

In a Pre-Money scenario, the valuation cap refers to the value of the company before the investment. The conversion math usually does not happen until the next equity round of financing.

This created a problem known as the pile-up effect.

If you raised money on multiple SAFEs with different caps, founders and investors often did not know exactly how much they owned until the priced round finally happened. The dilution was shared and often surprising.

The Post-Money SAFE shifts the clarity to the present. The investor locks in their percentage immediately. This means the dilution from that specific SAFE is calculated before the next round.

Clarity is good, but you need to understand the trade-off.

In the Post-Money version, the founder usually takes on the dilution risk of the round. Because the investor’s percentage is fixed based on the cap, any additional notes or SAFEs you raise will dilute existing shareholders (the founders) rather than sharing that dilution with the SAFE holders.

This makes it critical to treat the valuation cap as a hard number.

• It is not just a ceiling for the next round.
• It effectively sets the price of the equity you are selling right now.

This instrument is now the standard for Silicon Valley early-stage fundraising. Investors prefer it because they know exactly what they are buying.

It allows for high-resolution fundraising. You can close investors one by one without having to recalculate everything or worry about complex side letters.

However, you must model your cap table. If you raise too much money on low Post-Money caps, you can accidentally sell far more of your company than you intended. The math is simple, so use it to your advantage before you sign.