There are two versions of the Simple Safe Spreadsheet:

  1. New (March 2021)!  To view and purchase the new post-money Simple Safe Spreadsheet, please click here. This spreadsheet is for use with Y Combinator’s post-money Safe, Valuation Cap (No Discount).
  2. To purchase a downloadable Excel version of the Simple Safe Spreadsheet for pre-money Safes, click here.

Thank you for supporting this project and please stay tuned for future startup friendly resources.


Y Combinator’s Simple agreement for future equity (Safe) was created as an alternative to convertible debt and seed equity financing for startup companies. The Safe is a manifestation of Paul Graham’s concept of high resolution fundraising, which contends that startup financing is more efficient if companies can close different investments (sometimes at varying price and other terms) on a rolling basis with different investors. The Safe embodies this concept, while seeking to provide reasonable contractual protections for investors.

In the words of Carolynn Levy, the YC partner and former Wilson Sonsini lawyer who created the Safe, “[t]he Safe is just a convertible note with the ‘event of default,’ interest, and maturity date provisions stripped out. It is a convertible security with a creative acronym.”

Since the Safe’s release in December 2013, the startup community has engaged in a lively debate over the instrument’s benefits and drawbacks, including comments by lawyers herehere and here; venture capitalists herehere and here; and a Wall Street Journal article here. The Cooley law firm has created a Safe financing documents generator and Practical Law has developed its own form of Safe.

The main argument against the Safe from investors is that it lacks the maturity date, interest rate and certain other investor protections associated with convertible notes or seed equity. While this is true as to the standard form Safe, for some issuers and investors, the benefits of the Safe outweigh the marginally greater investor protections and complexities of convertible notes and seed equity. These Safe benefits include the following:

  • The Safe is a simple, short document of only 5 pages in length. Compare this to the often more complex convertible note (plus note purchase agreement) or seed equity financing, the latter which generally requires drafting and negotiation of an amended certificate of incorporation, investors’ rights agreement, stock purchase agreement, etc.
  • Similar to a convertible note, the Safe can be tailored to include a valuation cap, a discount or both (or neither), allowing it to be easily customized for the investor. Customizations may also include additional protections for major investors, such as rights of first offer (ROFO)observer rightsinformation rights and other rights.
  • The Safe is not debt, so a standard Safe has no interest payable and no maturity date, eliminating the need re-negotiate a convertible note at maturity.
  • The preferred stock issued to a Safe investor upon conversion has a liquidation preference equal to the amount the investor paid for the Safe, so the company is not unjustly burdened (and the investor is not unjustly enriched) with liquidation overhang.
  • The form Safe was first released in December 2013, allowing the market adequate time to familiarize itself with the Safe, expediting market acceptance.

The above benefits of the Safe mean that the closing of a Safe investment can sometimes be accomplished very quickly. This translates into faster access to capital markets for startups and lower legal fees.

In an effort to make Safe fundraising even more efficient for startups and investors, I have created a Simple Safe Spreadsheet, which hypothesizes various economic results for companies and investors using the Safe. The results include the preferred shares issuable to an investor upon the occurrence of an “Equity Financing” (e.g., Series A) at a given pre-money valuation and offering amount and the cash payable to an investor upon the occurrence of a “Liquidity Event” (e.g., sale of the company) for a given purchase price. The capitalized terms in the spreadsheet are the same as the defined capitalized terms in the Safe to facilitate cross-referencing and analysis. The spreadsheet’s results should be identical to the results given in Safe Primer examples if the Primer’s assumptions are used in the spreadsheet (with some variation due to rounding).