How to Split Equity Between Co-Founders (Without Regretting It Later)
The decisions you make in the early stages of your startup can affect control, funding, and friendships for years.
Starting a company with someone is exciting! Deciding how to split ownership between the initial group of founders can present an early challenge though.
It’s not surprising, then, that many founders will spend hours talking about the exciting stuff like product features and brand names but ignore discussing how to divide equity. When you see momentum grow behind a great idea, it can be easy to put stuff on the back burner that could slow that momentum.
Nevertheless, equity decisions made in the early days often become the most consequential legal and business decisions a startup ever makes. The way your equity is structured will affect control of the company, future fundraising, and what happens if a founder leaves or priorities change.
The goal isn’t to find a “perfect” split. The goal is to create a structure that still makes sense when things inevitably evolve, and to ensure that all founders are on the same page from the outset.
What “Equity” Actually Means
Many founders will briefly discuss what the appropriate ownership percentage split should be and that’s it. If two founders can agree that one gets 60% and another gets 40%, you’re done, right?
Not quite. This is the starting point, but what founders often miss is the need to dig into what this ownership percentage means and to think through all aspects that equity actually represents.
Before you settle on any numbers, ask yourselves:
Who controls major decisions?
Who benefits financially if the company succeeds?
How much will each founder be diluted as the company grows?
What happens if someone leaves?
How investors evaluate the company?
These questions matter because ownership percentage does not always equal control. A founder with 40% may still have significant decision-making power depending on the business’ governance structure. Conversely, a 50/50 split can create deadlock if there’s no mechanism to break ties.
Before deciding how to divide equity, founders should think about what ownership is meant to reflect: risk, contribution, and long-term involvement.
Common Founder Equity Splits (and When They Work)
There is no universal formula, but certain patterns show up frequently.
50/50 Splits
Equal splits are common, especially between two founders. They can work well when:
Both founders are contributing equally
Both are working full-time
Both expect to remain long-term
Roles and decision-making authority are clearly defined
However, equal splits can create problems if:
Contributions diverge over time
One founder becomes less involved
There is no tie-breaking mechanism for important decisions
Investors sometimes view 50/50 splits cautiously because they can lead to deadlocks that stall the business’ progress.
Uneven Splits (60/40, 70/30, etc.)
Uneven splits often reflect differences in:
Time commitment
Experience
Risk
Capital contribution
Leadership responsibility
These structures can work well if they reflect actual ongoing contribution and are paired with vesting.
Multi-Founder Splits
With three or more founders, the key is clarity. Who is leading? Who is technical? Who is investing time or capital? The more founders that are involved, the more important documentation and vesting become.
Factors to Consider When Deciding the Split
Equity should reflect expected long-term contribution, not just early excitement. Founders should discuss:
Who is working full-time versus part-time
Who is contributing capital
Who developed any existing IP or technology
Roles and responsibilities (CEO, technical lead, operations, etc.)
Relevant experience and track record
Opportunity cost and personal risk
Expected future contributions
These conversations can feel awkward early on, but it is MUCH easier to address this up front than it will be to negotiate through these issues once the business is operational and profitable. One of my favorite mantras is “good contracts foster good relationships.” If all parties go into the venture with clear expectations as to how certain business issues will be addressed then the likelihood that there will be misunderstandings and conflicts amongst the founders later will be decreased. That sets the table for the business to reach its full potential!
What Happens If a Founder Leaves?
Every founding team should address what happens if someone exits.
Scenarios to consider:
A founder voluntarily leaves
A founder is asked to leave
A founder becomes unable to continue
A founder stops contributing meaningfully
Well-drafted agreements will typically address:
Whether equity returns to the business or can be repurchased by the business
Whether the exiting founder can sell or transfer their equity to a third-party
How the equity is valued
What happens to the voting rights associated with the equity
It’s much easier to decide how these scenarios should be addressed at the outset rather than after a founder wants to exit or a dispute arises.
Common Mistakes Founders Make
In my experience, many founder disputes could have been avoided with proper planning during the startup phase of the company. Common mistakes that I see include:
Failing to address foundational legal formation issues just to avoid an awkward conversation with cofounders
Failing to document ownership, governance, and early decisions clearly
Using generic online templates that don’t reflect the actual situation
When issues do arise, they often won’t surface until the company has traction, investors, or meaningful revenue. By then, fixing them can be complex and expensive, or worse, it could lead to an important investor getting cold feet and backing out.
A Few Realistic Scenarios
Two friends start a company and split equity equally.
One leaves after eight months but keeps their full stake. The remaining founder now does all the work while sharing ownership with someone no longer involved.
A technical founder and business founder start together.
One works full-time building the product while the other contributes part-time. Without vesting or clear expectations, resentment builds as contributions diverge.
One founder invests capital while both founders work in the business.
Should the investor receive more equity? A loan? Preferred return? These decisions should be addressed early and documented clearly.
Each situation is different, which is why a one-size-fits-all template rarely works well.
When It Makes Sense to Get Legal Guidance
The decisions discussed above should be documented as early as possible, but preferably before significant development begins, fundraising rounds are undertaken, employees or contractors are hired, and before the company generates meaningful value.
A strong business attorney can guide you through many of these early decisions and help with the legal documentation needed to structure the business properly. Clear documentation ensures everyone is aligned and reduces the risk of disputes later. It’s usually worth getting advice when:
You are unsure which structure is best suited for your business goals
There is more than one founder
Contributions are unequal
Anyone is contributing IP or capital
Someone is leaving a job to join full-time
Outside investment is anticipated
A good startup lawyer doesn’t just draft documents. They help founders think through difficult scenarios early before those scenarios become expensive problems.
The Goal: A Durable Equity Structure
There is no universally “correct” way to split equity. The right structure is one that reflects contributions, aligns incentives, and can withstand change over time.
Most founders will revisit these decisions as the company grows. Taking the time to structure ownership thoughtfully at the beginning can save significant time, cost, and stress later.
Many founders spend more time choosing a logo than deciding how to divide ownership, but in practice, the equity conversation will matter far longer.
These decisions don’t have to be complicated, but they do need to be done right.
I help startup founders think through these scenarios and create clear documentation that protects everyone involved and sets the stage for long-term success. If you would like to talk, please contact me to set up a time to discuss your business and goals.
This blog post is provided for informational purposes only and does not constitute legal advice. The information contained in this blog post does not constitute legal advice, should not be relied on as a substitute for legal advice, and is not tailored to your specific situation. Reading this post does not create an attorney-client relationship between you and Bonfire Legal. Laws and regulations vary by jurisdiction and change over time, so you should consult with a qualified attorney regarding your particular circumstances before making any legal or business decisions.
