A dynamic equity split allocates ownership based on what each founder actually contributes over time, rather than a fixed percentage locked in on day one. As people add time, cash, ideas, or equipment, their share moves with them. The best-known version is Mike Moyer's Slicing Pie model. It fits some early teams well and others badly. Here's how to tell which you are.
What a dynamic equity split actually is
A fixed split bets on a future you can't see yet. You sit down in week one, guess who will matter most over the next three years, and carve the company into static percentages. Then reality diverges from the guess. One founder ghosts. Another triples their output. The numbers stay frozen while the work moves on.
A dynamic split refuses that guess. Instead of deciding shares up front, you track contributions as they happen and let ownership follow. Nobody has to predict who will carry the company. The company records who did.
The Slicing Pie model, published by entrepreneur and business-school professor Mike Moyer in his 2012 book, is the most complete version of this idea. It converts every input into a normalized unit called a slice. Your ownership percentage equals your slices divided by total slices (Equity Matrix). Add more, earn more. Contribute nothing, dilute.
How the slices work
Not all contributions carry equal weight. Cash is harder to get back than time, so it earns a higher multiplier. Moyer's framework applies a risk-weighted rate to each input type (Equity Matrix):
- Unpaid time — roughly a 2x multiplier on fair market value of the work.
- Below-market salary — the unpaid gap between your market rate and actual pay, also weighted around 2x.
- Cash invested — 2x to 4x, because money at risk is the hardest contribution to recover.
- Equipment and supplies — about 1x, valued at fair market rate.
- Intellectual property — 1x to 2x, based on what it cost to develop.
The multipliers are the whole point. They reward the contributions a founder can least afford to lose, and they keep a check-writer and a full-time builder on comparable footing.
Fixed split vs. dynamic split
Both models can be fair. They fail in different ways. This is the honest trade-off.
| Fixed split | Dynamic split (Slicing Pie) | |
|---|---|---|
| How it works | Percentages agreed up front, held steady | Ownership recalculated as contributions land |
| Best for | Clear roles, known commitment, near a raise | Bootstrapped, uncertain roles, pre-funding |
| Strength | Simple, clean cap table, investor-ready | Tracks reality, defuses "who earned what" fights |
| Weakness | Rewards a plan, not the work; stale fast | Heavy tracking burden; subjective on ideas |
| On a founder exit | Vesting claws back unearned shares | Earned slices can stay unless terms say otherwise |
The strongest case for dynamic equity is conflict. One attorney who studied the model reported that before adopting it, at least half of the founding teams he worked with had an equity dispute inside the first year, and that Slicing Pie "virtually eliminated" those disputes (Forbes Legal Council). When ownership tracks contribution, there is less to argue about, because the ledger already answered the question.
The criticisms you should take seriously
Dynamic equity is contested, and the objections are real. Name them before you commit.
The tracking burden is heavy. The model only works if someone logs every hour, expense, and contribution with discipline. Many teams start strong and quit within months. When the log lapses, the split it produces is fiction. Defenders note that most companies already track payroll, expenses, and investments, so the extra work is smaller than it looks (Forbes Legal Council) — but "smaller than it looks" still assumes a team that keeps records at all.
Some contributions resist valuation. Time and cash have market rates. Ideas and relationships don't. Pricing them invites the exact nit-picking the model was meant to end.
Early departures can leave dead equity. The base framework has no cliff. A founder who works two months and walks can keep the slices they earned, unless your agreement explicitly recovers them (Equity Matrix). This is why a dynamic split does not remove the need for a vesting schedule — it changes what vesting sits on top of.
Investors want a fixed cap table. Slicing Pie is a pre-funding tool. Before a priced round, you freeze the pie into fixed percentages. Institutional money will not buy into a split that keeps moving (Equity Matrix).
The framework carries no legal structure of its own. The model tells you the math. It does not draft the contract. Enforceability lives entirely in the agreement you sign around it.
Should you use it?
Use a dynamic split if you are bootstrapped, roles are genuinely unclear, and no one can honestly say today who will carry the load. It buys you fairness while the picture is still forming, and it takes the heat out of the equity conversation.
Lean toward a fixed split if roles are settled, commitment is proven, or a raise is close. At that point the tracking overhead costs more than it returns, and a clean split serves you better. Many teams do both in sequence: run dynamic while bootstrapping, then convert to fixed at a defined trigger.
Whichever you pick, the model is not the agreement. Write down the trigger that freezes the pie, the multipliers, the exit terms, and the conversion event. Pair it with vesting so nobody keeps equity they didn't stay to earn. If you are still weighing the philosophy behind any of this, our guides on fair vs. equal splits and how to split cofounder equity work through the underlying decisions, and the free templates give you a starting contract.
A split is only as good as the agreement that holds it. Choose the model that matches your stage. Then document the agreements, and keep it current.
Frequently asked questions
- What is a dynamic equity split?
- A dynamic equity split allocates ownership based on what each founder actually contributes over time, not a fixed percentage agreed on day one. As people add time, cash, or resources, their share adjusts. The best-known version is Mike Moyer's Slicing Pie model.
- How does the Slicing Pie model work?
- Every contribution becomes a normalized unit called a slice. Your ownership equals your slices divided by total slices. Cash carries a higher multiplier than time because it is harder to recover, so investors of money earn slices faster than investors of hours.
- Is a dynamic equity split legally enforceable?
- It can be, but the framework itself provides no legal structure. You need a signed agreement that references the model and defines how slices convert to real shares. Most companies must convert to a fixed split before raising outside capital.
- Do investors accept the Slicing Pie model?
- Not directly. Venture investors expect a clean, fixed cap table. Slicing Pie is meant to run during the bootstrapped, pre-funding phase, then freeze into a fixed split at a defined event like a priced round or a set founding date.
- What are the main downsides of dynamic equity?
- It demands disciplined tracking of every contribution, which many teams abandon. Valuing ideas and relationships is subjective, and early departers can keep earned equity. It also has to be converted before institutional fundraising.
