Most founders put this conversation off for months. You know it needs to happen, but every time you picture saying “so, what percentage do you want?” your stomach drops.
That fear is normal. It’s also expensive. Cofounder disputes over ownership sink more startups than bad products do, and they almost always start the same way: nobody said the uncomfortable thing early, so it came out later, angrier.
This guide gives you the words. You’ll get a prep checklist, scripts for each stage of the conversation, answers to the pushback you’re likely to hear, and a few mistakes to avoid.
Before You Say a Word: Do This Prep First
Walking in unprepared is the fastest way to turn a business conversation into an argument. Spend an hour on the following first.
Get clear on the stage of your company
The right split depends heavily on where you are today.
- Idea stage, nothing built: Both of you carry nearly equal risk. Splits close to equal are common.
- You have a prototype, customers or early revenue: You’ve already done real work, and that deserves to be recognised. But your cofounder is still taking on years of future work.
- You have funding: Salary and equity are now a package, and the conversation changes.
Write down what each person brings
Make two columns. In one, list what you contribute: the idea, domain knowledge, customer research, relationships, money invested, time committed. In the other, list what your technical cofounder contributes: building the product, architecture decisions, hiring engineers later, maintaining the thing when it breaks at 2 a.m.
Be honest, especially about the second column. Non-technical founders tend to overvalue the idea. Execution is where most of the value gets created.
Remember what equity is actually paying for
Here’s a useful way to think about it. Equity isn’t a reward for what happened before today. It’s payment for the next four years of work. If you hold that view, the conversation gets much calmer, because you’re negotiating about the future rather than defending the past.
Decide your range, not just one number
Know the split you’d love, the split you’d happily accept, and the split below which you’d walk away. Going in with one fixed number turns the talk into a standoff.
How to Set Up the Conversation
How you invite someone to this talk matters as much as what you say in it.
Pick the right time and place
Don’t ambush them in the middle of a work session or over a chat message. Ask for a proper slot. Somewhere calm, with no deadline pressing on either of you.
Script to book the conversation:
“Hey, there’s something I think we should talk about properly: how we split ownership of the company. It’s not urgent and nothing’s wrong. I just want us to sort it out while we’re both clear-headed. Can we set aside an hour this week?”
The line “nothing’s wrong” does a lot of work here. Without it, people assume the worst.
The Scripts: Step by Step
Step 1: Opening the conversation
Start by naming the awkwardness. It lowers tension immediately.
“I’ll be honest, I’ve been putting this off because I wasn’t sure how to bring it up. But I’d rather have an awkward hour now than a resentful year later. I want us both to feel good about this.”
Then state your goal as a shared one:
“What I want is a split that feels fair to both of us in two years, not just today.”
Step 2: Ask before you propose
Resist the urge to lead with a number. Ask how they see it first. Whoever speaks first sets the anchor, and you want to know what’s in their head before you reveal yours.
“Before I share my thinking, how do you see our roles? And what would feel fair to you?”
Listen fully. Don’t interrupt, and don’t react with your face. You’re gathering information.
Step 3: Share your reasoning, then your number
If they ask for your view, give the logic first and the number second.
“Here’s how I’m thinking about it. You’ll be building the product, which is the biggest piece of work in the first couple of years. I’m taking on sales, fundraising and operations, and I’ve already put in about [X months] of customer research. Given that, I was thinking something in the range of [X/Y]. But I’m open to talking through it.”
The words “something in the range of” keep the door open without sounding weak.
Step 4: Talk about commitment, not just percentages
Equity means little if one person is full-time and the other is working weekends. Raise this directly.
“Can we also be clear about commitment? I’m going full-time from [date]. What’s your timeline for that? If it’s different, I think our split should reflect it.”
This one question prevents more future fights than almost anything else.
Step 5: Bring up vesting
Many founders skip this because it feels like you’re saying “I don’t trust you.” You’re not. Vesting protects both of you.
“I’d like us both to be on a four-year vesting schedule with a one-year cliff. That way if either of us leaves early, the company isn’t stuck with a big chunk of equity held by someone who’s gone. It applies to me too.”
Saying “it applies to me too” is what makes this land well.
Step 6: Close and confirm in writing
Don’t end on “let’s think about it” with nothing scheduled.
“It sounds like we’re close. Let’s both sleep on it, and I’ll write up what we discussed tonight so we can check we’re on the same page. Can we confirm by Friday?”
Then actually send that written summary the same day.
When Your Cofounder Pushes Back (And What to Say)
You’ll rarely get a clean “sounds great.” Here are the common objections and calm ways to respond.
“I’m doing all the building, so I should get more.”
“You’re right that the build is the biggest piece right now, and I want that reflected. Let’s list everything the company needs over the next four years and see who covers what. That way we’re looking at the whole picture rather than just the first six months.”
“This was your idea, so you should keep a bigger share.”
This one is generous, but accepting it blindly can backfire later.
“I appreciate that, truly. But I don’t want to start with a split that makes you feel like an employee. Ideas are cheap. Making it real is the hard part, and that’s most of your work.”
“Can’t we just split it 50/50 and figure it out later?”
An equal split can be completely fine. Plenty of strong teams use it. The danger is “figure it out later.”
“I’m open to equal. I just want us to agree on vesting, roles and what happens if one of us leaves before we shake on it. Can we nail those three things down first?”
“I need more because I’m giving up a good salary.”
That’s a legitimate point, and ignoring it will cost you.
“That’s fair, and I don’t want to pretend it isn’t a real sacrifice. Let’s talk about whether it makes sense to adjust equity, pay you something once we have revenue, or do some of both.”
If You Are the Technical Cofounder
This guide often gets read by developers too, so here’s the other side.
- Don’t undervalue your skills. If you’re the one building the product, your share of future value is large. Investors also look at this split, and a very low technical share can make them wonder about the strength of the team.
- Ask about commitment too. You deserve to know whether your partner is all-in.
- Get decision rights clear. A line like this helps:
“I’m happy to defer to you on sales and fundraising decisions. I’d like the final say on technical choices like architecture and hiring engineers. Does that work?”
Alternative Ways to Split Equity
If the two of you can’t agree on a gut-feel number, use a method.
The weighted factors method
List the factors that matter, such as the idea, domain expertise, business planning, commitment and risk, and responsibilities. Give each a weight based on importance, score each founder from 0 to 10, multiply, add up, and convert to percentages. The maths isn’t the point. The point is that you’re both arguing about factors, not about each other.
Dynamic equity
Instead of fixing the split today, equity is earned over time based on what each person actually contributes (hours, cash, results). This is useful when roles are unclear, or when one person is part-time at first.
Equal split with vesting
Simple, clean and emotionally easy. It works best when both of you are fully committed from the same date.
Common Mistakes to Avoid
- Avoiding the topic until investors force it. By then you’re negotiating under pressure.
- Skipping vesting. If your cofounder leaves after six months with 40% of the company, you’ve got a big problem.
- Agreeing verbally and never writing it down. Memories drift. Put it in a founder agreement.
- Treating it like a win-lose negotiation. You’re going to work with this person for years. A “win” that leaves them quietly resentful is a loss.
- Forgetting IP. Make sure everything built for the company belongs to the company, including code written before incorporation.
- Not planning for exits. Decide now what happens to equity if someone leaves, gets sick or stops contributing.
What to Put in Writing Afterwards
After the conversation, turn the key points into a short founder agreement. At minimum, include:
- The agreed equity split and the reasoning behind it
- Vesting schedule and cliff
- Roles and who has final say on what
- IP assignment to the company
- What happens if someone leaves
- How you’ll resolve a serious disagreement
Have a startup lawyer review it. It costs far less than a dispute.
Final Thoughts
The equity conversation feels huge because it’s about money, trust and the future all at once. But it’s really just a series of small, honest exchanges. Prepare your thinking, ask before you tell, explain your reasoning, talk about commitment and vesting, and write it down.
If you do that, you’ll probably walk out with more than a fair split. You’ll have a cofounder who knows you can handle hard conversations, and that’s worth more than any percentage.
Frequently Asked Questions (FAQs)
How much equity should a technical cofounder get?
There’s no single correct number. At the idea stage with equal risk, splits close to equal are common. If you’ve already built significant traction or put in money, the split may lean toward you. Judge it by future contribution, commitment and risk.
When should I have the equity conversation?
As early as possible, ideally before either of you starts serious work. The longer you wait, the more complicated and emotional it becomes.
Should I give equity upfront or use vesting?
Use vesting. A four-year schedule with a one-year cliff is the standard approach. It protects the company and both founders if someone leaves early.
Is a 50/50 split a bad idea?
Not necessarily. It’s simple and signals mutual respect. It becomes risky only if one person is less committed or if there’s no clear way to break a deadlock. Agree on decision-making rules if you go equal.
What if my cofounder wants more than I’m comfortable giving?
Don’t answer in the moment. Ask them to explain their reasoning, compare contributions using a weighted method, and consider alternatives such as a salary, performance milestones or dynamic equity.
Do I need a lawyer for a cofounder agreement?
It’s strongly advised. A short agreement reviewed by a startup lawyer can prevent disputes that would otherwise cost you the company.
What if I’m hiring a developer rather than finding a cofounder?
Then you’re probably looking at a smaller equity grant (or none) combined with a salary or contract fee. A cofounder carries long-term risk and responsibility the way an employee doesn’t.
What should I do if the conversation turns tense?
Pause. Say something like: “Let’s take a break and come back to this tomorrow. I want us both to feel good about it.” A short break is better than a heated decision.
