The Basic Definitions
Pre-money valuation is what the company is worth before the investment. Post-money valuation is what the company is worth after the investment. The relationship is simple:
Post-Money = Pre-Money + Investment Amount
If a company has a $10M pre-money valuation and raises $2M, the post-money valuation is $12M. The investor owns $2M/$12M = 16.67% of the company.
Why the Distinction Matters
The difference between pre and post-money has a direct impact on ownership percentages. Consider two scenarios for a $2M investment:
- $10M pre-money: Investor gets $2M/$12M = 16.67%
- $10M post-money: Investor gets $2M/$10M = 20.0%
That 3.33% difference represents real money. On a $100M exit, that is the difference between $16.67M and $20M to the investor, and conversely, $3.33M less for the founders. Always clarify whether a discussed valuation is pre or post-money to avoid expensive misunderstandings.
Post-Money SAFEs
Y Combinator's post-money SAFE introduced a new dimension. When a SAFE specifies a post-money valuation cap of $10M, it means the SAFE investor's ownership is calculated as if the post-money valuation is $10M inclusive of all SAFE money raised at that cap. This means:
- A $1M SAFE with a $10M post-money cap gives the investor 10% ownership
- A $2M SAFE with a $10M post-money cap gives 20% ownership
- Each additional dollar raised at that cap dilutes the founders, not the SAFE investors
This is a critical distinction from pre-money SAFEs, where additional investors at the same cap diluted everyone proportionally.
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Common Mistakes
First-time founders frequently make these errors:
- Confusing pre and post-money in term sheet discussions, leading to a real difference in ownership (16.67% against 20% in the example above)
- Not modeling dilution from post-money SAFEs when raising from multiple investors at the same cap
- Comparing valuations across rounds without adjusting for the investment amount (a $20M post-money Series A after a $5M raise implies a $15M pre-money, not a $20M step-up from a $10M seed post-money)
Practical Negotiation Tips
When negotiating valuation, be precise about terminology. State your terms as either "we are looking for a $12M pre-money valuation for a $3M raise" or "we are raising $3M at a $15M post-money valuation." Both statements describe the same economics but remove ambiguity.
Always model the cap table impact at both the current round and the next anticipated round. A seemingly high pre-money valuation today is meaningless if the resulting ownership structure makes the next round impossible to price without excessive founder dilution.