When co-founders split up, the cause is often a conversation they skipped in the first month. Usually it’s about money, roles, time, or what happens if one person wants out. These questions to ask a co-founder cover exactly those topics. Use them over a few conversations rather than one interview, and write the answers down, because you’ll want them later.
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How to use these questions to ask a co-founder
Spread the questions across three or four meetings: a coffee, a working session, a long dinner and, ideally, a short trial project. Both of you should answer every question, since the point is to compare answers, not to grill one person.
Then keep the answers in a shared document. By the end, that document becomes a rough draft of your founders’ agreement. Y Combinator’s list of 10 questions to discuss with a potential co-founder is a useful checklist to compare against, too.
Questions about motivation and goals
Start with why, because different reasons lead to different decisions later:
- Why this company, and why now?
- What would success look like in five years, for you personally?
- Would you rather build a profitable small company or chase a big outcome with investor money?
- What would make you walk away?
Listen for honesty rather than polish. “I want to prove I can do this” is a fine answer. On the other hand, a vague answer to “What would make you walk away?” is worth probing.
Questions to ask a co-founder about roles and decisions
Next, get specific about who does what. Overlap feels friendly at the start, but it causes friction once the work piles up.
- Who should be CEO, and why?
- Which decisions need both of us, and which can each of us make alone?
- How do we break a tie?
- What work do you not want to do?
The last question matters more than it looks. Every startup has unglamorous work, such as bookkeeping, support tickets and chasing invoices. Agree now on who owns it.
Questions about the idea and your customers
Ideas change, so agree on how you’ll handle that rather than on the idea alone:
- What problem are we solving, and for whom exactly?
- How will we know within three months whether it’s working?
- If the first version flops, would you rather pivot or stop?
- Who talks to customers every week, and how do we share what we hear?
The pivot question tells you a lot. Some people are attached to the product, while others are attached to the problem. In fact, either can work, but two founders who differ on this will clash the first time the numbers disappoint.
Questions to ask a co-founder about money and equity
Money is where many partnerships crack, so these questions to ask a co-founder need clear answers:
- How should we split equity, and what’s the reasoning behind it?
- Will our shares vest? A common setup is four years of vesting with a one-year cliff.
- How many months can you work without a salary?
- Will either of us put money in, and on what terms?
An even split is not automatically fair, and an uneven one is not automatically unfair. What matters is that both of you can explain the split and still agree with it a year from now.
Questions about time, place and life
Commitment problems tend to show up slowly. Ask early instead:
- From when will you work on this full-time, and what milestone triggers it?
- Where will we work: the same city, or remotely?
- What commitments outside work should I know about?
- How many hours a week is realistic for you right now?
Remote teams across borders are common now. For example, a founder in Dubai can work well with an engineer in Warsaw. Still, agree on core overlap hours and on how often you’ll meet in person, since time zones quietly shape every meeting.
Questions to ask a co-founder about conflict and exits
Nobody likes this part. Even so, it’s the section you’ll be most grateful for later:
- How do you prefer to receive hard feedback?
- Tell me about a work conflict you handled badly. What did you learn?
- If one of us leaves in the first year, what happens to their shares?
- If we get an acquisition offer we disagree on, how do we decide?
Answers about past conflict are especially revealing. Someone who can describe their own part in a fight is far easier to work with than someone who blames everyone else.
Red flags to listen for
A single odd answer isn’t a deal-breaker. However, watch for patterns like these:
- Vague answers on time. “I’ll go full-time when it feels right” often means never.
- Equity without vesting. Asking for a large stake with no vesting shifts all the risk onto you.
- No ownership of past conflict. Every story ends with someone else at fault.
- Avoiding money talk. If personal finances are off limits now, they’ll be a surprise later.
- Resistance to writing things down. Good partners like clarity, because it protects both sides.
Test the answers with a trial project
Talk only gets you so far. Before you sign anything, work together on something real for two to four weeks, such as a prototype, a set of customer interviews or a pitch deck. Our guide to finding a technical co-founder explains how to set up a paid trial project fairly.
After that, put what you’ve agreed in a founders’ agreement and have a lawyer in your country review it. Rules on vesting, share classes and partner liability differ between, say, Delaware, England and Germany. If you’re unsure whether you’re forming a partnership or a company, our post on co-founder vs founder explains how roles, equity and legal status differ.
Frequently asked questions
What questions should you ask a potential co-founder?
Cover six areas: motivation, roles, money and equity, time commitment, location, and conflict and exits. Above all, ask each person to answer the same questions so you can compare.
How long should you know someone before co-founding a company?
There’s no fixed rule. Many founders work together on a trial project for a few weeks first, because shared work reveals more than months of coffee chats.
What are the biggest co-founder red flags?
Vague time commitments, equity without vesting, and an unwillingness to talk about money or past conflicts.
Do co-founders need a written agreement?
Yes, in almost every case. A written agreement covering equity, vesting, roles and exits protects both of you. Have a local lawyer review it, since the rules vary by country.
Ask now, not later
The right questions to ask a co-founder take a few awkward hours now and save months of conflict later. If you haven’t met that person yet, our guide on how to find a business partner covers where to look. You can also try our co-founder matching app, or get Kradoz on Google Play and set your goal to finding a co-founder.
