Technical Co-Founder Equity
vs Agency Cost Calculator
Most founders treat a co-founder as "free" and an agency as expensive. This calculator shows the real cost of equity at exit — and at what exit value an agency becomes the cheaper option.
Co-Founder Equity Cost Calculator
Compare what co-founder equity is worth at exit vs what an agency costs today.
At a €20M exit: the agency saves you €4,940,000 compared to giving equity. Equity is only cheaper if your exit exceeds €240,000.
Break-even exit value: Agency becomes cheaper than 25% equity at any exit above €240,000. Below that, the agency costs more in absolute terms — but co-founder equity is always diluted further by investor rounds.
This is a simplified comparison. Real equity cost is affected by investor dilution, vesting schedules, and liquidation preferences. Read the full analysis.
How to interpret the results
The calculator compares two numbers: the value of co-founder equity at a given exit, and the one-time cash cost of building the same product with an agency.
The break-even exit value is the point at which equity becomes more expensive than cash. Below that exit value, the agency is cheaper in absolute terms. Above it, equity was the more expensive choice — but equity also provides things cash cannot: alignment, judgment, and often the ability to raise VC that requires a technical co-founder.
What the calculator does not capture
- Investor dilution. Co-founder equity is further diluted by investor rounds. A 25% stake at founding may be 12–15% by Series A. This makes equity even more expensive in practice than the calculator shows.
- Liquidation preferences. Investor liquidation preferences can significantly reduce what common shareholders (including co-founders) receive at exit, particularly in down-round scenarios.
- Vesting. Co-founder equity is vested over 4 years. If the co-founder leaves before vesting is complete, the unvested equity returns to the company — reducing the effective cost of the equity.
- Non-financial value of a co-founder. The right technical co-founder provides judgment, recruiting credibility, and investor confidence that an agency cannot. These are real and significant — and not captured in this model.
When equity is clearly worth it
- You are targeting institutional VC that requires a technical co-founder
- Your product requires genuine technical innovation, not execution
- You have found the right person — technically strong, product-minded, aligned on long-term vision
- You cannot afford agency fees
When an agency is clearly better
- You need to validate before diluting — test the product first, raise equity later from a position of strength
- You have not found the right co-founder candidate and your market window is closing
- Your product is execution, not invention — the technical challenge is building something, not discovering something
- You want to approach co-founders with a live product and traction rather than a pitch deck
The hybrid path
The most common successful pattern: use an agency to validate, then attract a co-founder with proof. An agency builds the MVP; you validate with real users; you approach technical co-founders with revenue and momentum rather than an idea. The equity you give up at that stage is less (your company is worth more), and the quality of co-founder you attract is higher (strong technical leaders prefer proven products).
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