Key Takeaways
- There are three main models for splitting profit in a partnership: eat-what-you-kill, lock-step, and formula.
- Each model shapes the culture and long-term behavior of the firm — it's not just accounting, it's constitution.
- The formula approach tries to take the best of both worlds: it rewards current performance while protecting long-term investment.
- Non-financial contributions — mentoring, business development, content, firm-building — can and should be valued in any fair system.
At some point, if you bring in a partner or collaborator, you'll face a question that makes most people uncomfortable: how do we split what we earn?
This is one of those conversations that gets postponed until it becomes a crisis. Don't let it. The profit-sharing formula in any partnership is essentially its constitution — it determines what gets rewarded, what gets ignored, and ultimately what kind of firm you're building.
Having spent years running a consulting practice and thinking hard about this, I've come to believe there are really only three models. Everything else is a variation.
Model 1: Eat What You Kill (EWYK)
The logic here is simple: you bring in X, you contribute Y to shared costs, you keep the rest.
It's popular because it feels fair and transparent. High performers see a direct connection between their effort and their paycheck. There's no arguing about who's pulling their weight — the numbers speak.
But EWYK has real costs. Partners in these structures tend to hoard clients rather than refer them internally, because every cross-referral is money you're giving away. Junior people struggle to get senior attention because mentoring doesn't show up in the payout. And if your shared costs are high, a partner having a slow quarter may resist any investment in growth — it's coming out of their pocket.
My observation: EWYK firms can grow fast, but they have a hard time staying integrated beyond a certain size.
Model 2: Lock-Step
The opposite extreme. Everyone gets an equal share, or shares that grow with tenure rather than performance.
This sounds inefficient on paper, but it produces a very specific culture: deep collaboration, no internal competition, strong interest in the firm's long-term health. If the whole pie gets bigger, everyone wins — so everyone helps make it bigger.
The downside is that it moves slowly. Bringing in a new partner dilutes everyone's share, so it only happens after long deliberation. Star performers occasionally feel undervalued. And it can reward inertia.
In practice, lock-step works best where trust is very high and partners have been together for a long time. It's more common in older, established firms than in younger ones.
Model 3: The Formula
This is the middle ground — and in my view, the most interesting option for a growing consulting practice.
A formula-based system tries to measure multiple kinds of contribution: client origination, client work, non-financial contributions. You set explicit weights for each and calculate everyone's share accordingly.
Here's roughly how it works at firm I've been running. Profit is split three ways:
Fixed base. Every partner receives the same minimum monthly amount regardless of performance. This creates a floor and reduces the anxiety of slow months.
Current contribution (quarterly). A portion of profit is distributed based on each partner's share of revenue in the current quarter. This rewards recent performance.
Historical contribution (rolling 3 years). The same calculation, but using the past three years. This rewards partners who built the firm over time — and it means a slow quarter doesn't wipe out years of work.
The result is that two partners can have very different quarterly performances and still receive similar total compensation, because their history is factored in. And a new partner who brings in a lot of revenue quickly starts to move up without displacing the people who built the foundation.
The Part Most Firms Get Wrong: Non-Financial Contribution
Revenue is easy to count. But what about the partner who writes articles or does public speaking? Does that bring in clients? Or the one who runs training sessions for junior staff? Or handles the firm's finances, systems, and operations?
None of that shows up in a revenue calculation directly. Which means in a pure financial model, it goes unrewarded — and eventually, it stops happening.
Our solution: those contributions are tracked in hours. Each partner logs their non-billable development time, and we convert those hours into a monetary equivalent using their hourly rate. That "virtual revenue" is added to their financial contribution before calculating percentages.
It doesn't need to dominate the calculation. Even a 10–15% swing is enough to change behavior and signal that the firm values this work.
The Right Model for You
If you're just starting a partnership, EWYK is probably the path of least resistance. It's simple, transparent, and easy to explain.
If you've been working together for years and trust each other deeply, a lock-step approach might fit your culture.
If you want something that scales with complexity, rewards multiple types of contribution, and survives the growth of the firm — invest the time to build a formula. It takes longer to design, but it pays dividends for years.
Whatever you choose: write it down, agree on it before you need it, and revisit it every year. The formula is only as good as the conversation that built it.