Founder Equity Split: Set It Before the Raise

Before the term sheet, you need to decide who owns what, how it vests, and how much the raise will shrink it. The founders who get this right do not chase a perfect number. They set a defensible split, attach vesting, and model the raise before it can reopen the split.

Equal splits are common. In 2024, 45.9% of two-founder startups used them, up from 31.5% in 2015. Y Combinator has advised founders to split equity equally. That advice is useful, but it is not a substitute for a written record of why the split makes sense.

Use a four-part worksheet so the split can survive the raise:

• Score contribution, risk, and future role.
• Set four-year vesting with a one-year cliff.
• Model dilution.
• Keep the founding team small.

Score the split before you sign anything

Separate the questions: what each founder has already put in, what each founder is risking, and what each founder will do next. Contribution is the past, risk is the exposure, and future role is the job the company will actually pay for.

Score each item on the same scale, then compare the totals. A founder who has built the prototype, left a job, and will run product should score higher. A co-founder with a customer list, who will run sales, and who is taking on the legal risk of incorporation should score higher too. The worksheet becomes a table where every point has a reason attached.

Do not score feelings. Use facts: code, customers, contracts, capital, time, and the willingness to keep working when the money is not there. A split that cannot be explained in plain language will be hard to defend when the company grows.

Vest the equity so the team stays honest

Set the vesting schedule to the common shape: four years with a one-year cliff, so the first 25% lands after year one and the rest earns over the remaining three years. That structure protects the company if a founder stops contributing after the early work.

Treat vesting as alignment, not punishment. The schedule keeps the split tied to ongoing work. A founder agreement says when shares become the founder's to keep, what happens if a founder leaves, and whether unvested shares can be bought back.

Keep the schedule simple. Complex acceleration clauses, which speed up vesting, can create disputes later. A clean standard form is easier to defend. Write down why any special provision is necessary for your team.

Model dilution before the money arrives

Build a simple cap table before you negotiate, with columns for pre-raise ownership, investor ownership, and post-raise ownership. Some startup structures keep 60% to 90% for the founding team and give early employees 1% to 5% each. That range gives you a sanity check for how much room the company needs for future hires.

Then run a dilution case. If the founding team starts with 90% and gives investors 20%, a 30% founder stake drops to about 24%. The math is not dramatic, but it is enough to change how you talk about control, board seats, and who can block a sale. The model shows whether the founders still own a majority after the raise, or it records a clear decision that they will not.

Include the option pool, the reserve for future employee equity, in the model, even if the company has not hired anyone yet. The pool is where future employees will come from, and it can change the effective ownership of the founders. When the post-raise numbers feel uncomfortable, adjust the split or the raise size then, not after the money lands.

Keep the founding team small

Decide who is a founder and who is an early employee before the paperwork. Investors tend to view four or more co-founders with skepticism. A smaller founding team makes the split cleaner and the decision-making faster. Someone who needs equity but not founder status should get an early-employee grant instead of expanding the founder group.

Advisors, friends, and early contractors are not automatically founders. Founder status usually comes with control rights, board expectations, and a larger ownership stake. Keep the person out of the founder pool if they are not doing the work that makes the company possible.

The split is a prediction about who will keep doing the work. Put the worksheet in the founder agreement while the numbers are still easy to change.

This article is general information, not investment or legal advice.