TL;DR
This guide covers startup equity in seven questions, from splitting ownership with co-founders to vesting, dilution, and owning shares under 18. The key choice is between an equal split and one based on each person's role and commitment. It's for you if you're building a business with friends in high school. A typical vesting setup gives you 25% of your shares after one year and the rest over the next three. If you want a mentor to help your team work through roles and ownership, Young Founders Lab is a good place to start.
Equity in a startup means owning a percentage of a business. If you're building something with friends, understanding equity helps you decide who owns what, how decisions get made, and what happens when someone stops contributing. You might think these questions only matter once your startup makes money or attracts investors, but disagreements about ownership can start long before either happens.
You don't need to know corporate finance or have a registered company to follow these ideas. We'll use examples involving student-built apps, tutoring services, and small online businesses, so you can apply them to projects you're already considering. If you want to build your business knowledge further, explore our guides to online finance programs for high school students and startup incubators for high school students.
What is equity in a startup?
Equity in a startup is an ownership interest in a business, usually expressed as a percentage of the company. When you own equity, you hold a portion of the business rather than simply getting paid for completing a task. That ownership may give you certain financial and decision-making rights, depending on how the company is set up and the terms attached to your interest. For example, imagine you and your friend launch an app called StudyLoop. You decide to divide ownership equally, and your company eventually issues 100 shares.
You own 50 shares, representing 50% of the company.
Your friend owns 50 shares, representing the remaining 50%.
Together, you own all 100 shares, representing 100% of the company.
If your company is valued at $10,000, your 50% stake has a theoretical value of $5,000. However, that doesn't mean you have $5,000 sitting in your bank account. The value of private startup shares can be hard to pin down, and you generally can't turn them into cash unless there's a permitted transaction, such as a share sale or the company being bought. Equity also isn't the same as revenue or profit. If StudyLoop earns $1,000 from subscriptions, that money belongs to the business. It might be used to pay hosting fees, improve the app, or cover other expenses. You don't automatically receive $500 just because you own half the company.
How does equity get split between founders?
Founders usually split equity by agreeing on how much ownership each person should get, based on their responsibilities, contributions, and expected long-term commitment. An equal split is a common starting point when founders join at the same stage and expect to put in similar effort. However, equal ownership isn't automatically the fairest arrangement for every team. In its guide to splitting equity among co-founders, startup accelerator Y Combinator argues that founders should default to equal or nearly equal splits, since most of the work of building a successful company lies ahead of them. Having the original idea doesn't necessarily justify owning most of the company.
| Founder | Main responsibility | Expected contribution |
|---|---|---|
| You | Customer research, tutoring partnerships, and operations | 8 hours per week |
| Founder B | Website development and maintenance | 8 hours per week |
| Founder C | Social media and marketing | 8 hours per week |
What are the common ways to divide founder equity?
You'll generally come across three approaches when discussing ownership:
Equal splits: You divide ownership equally, or as close to equally as possible, among founders. This can work when everyone has similar responsibilities, puts in similar effort, and plans to stay involved for the long term.
Contribution-based splits: You assign different ownership percentages based on expected responsibilities, time commitments, relevant skills, resources, and ongoing contributions. For example, two founders might discuss a 60/40 split if one is expected to manage most of the business and the other has a narrower but still important role.
Milestone-based arrangements: You discuss whether some ownership should depend on staying involved or meeting specific agreed conditions. Formal arrangements need careful drafting, since vague promises such as "you'll get more equity if you work hard" can lead to disputes.
What is vesting?
Vesting is a process through which you earn or keep your equity over time, usually by continuing to work on the startup. It helps protect a company when a founder receives a large ownership share but leaves before making the expected long-term contribution. Imagine three friends agree to own one-third of a startup each. You spend the next year developing the product, while one friend leaves after two months to focus on school. Without the right arrangement, that person might keep their full ownership even though the remaining founders are doing nearly all the work.
A common startup arrangement involves four-year vesting with a one-year cliff. A cliff is the waiting period before any of your shares vest. Under a typical version, you get credit for the first 25% of your shares after one year, and the rest vests gradually, month by month, over the following three years.
What is dilution in a startup?
Dilution happens when your ownership percentage goes down because the company issues more shares or ownership interests. You may still own the same number of shares, but those shares now represent a smaller slice of the business. Suppose you start a company with 100 shares and own 50 of them, so you own 50% of the business. Later, your startup raises money by issuing 100 new shares to an investor. There are now 200 shares in total, but you still own your original 50, so your ownership has dropped from 50% to 25%. That might sound like a bad deal at first. However, a smaller percentage of a more valuable company can be worth more than a larger percentage of a less valuable one.
Consider this simplified example (in this illustration, your ownership percentage has been cut in half, but the theoretical value of your stake has doubled):
| Before investment | After investment | |
|---|---|---|
| Company value | $10,000 | $40,000 |
| Your ownership | 50% | 25% |
| Theoretical value of your stake | $5,000 | $10,000 |
If new funding helps you improve your product, reach customers, and grow the business, accepting some dilution may make sense. As a student founder, you're unlikely to need a complicated fundraising model while you're just testing an idea. Still, understanding dilution helps you see why giving away equity casually can affect your ownership later, and our guide to getting investors for a high school startup explains when outside funding starts to make sense.
Can a minor actually hold equity in a startup?
Yes, minors may be able to hold shares or other ownership interests, but setting up and managing formal equity arrangements can be legally complicated when you're under 18. The rules depend on your country, state or province, company structure, and the type of transaction involved.
If you're 16 and developing an app with friends, this doesn't mean you need to drop your business idea until you're 18. You can still work on customer research, product development, testing, marketing, and writing down your team's intentions. Before signing an equity agreement, transferring ownership, or registering a business, ask a qualified professional about the rules that apply where you live. Our guide to starting a business when you're under 18 covers the broader legal basics.
What should you actually do about equity as a student founder?
For most early-stage teen projects, start by writing down everyone's responsibilities and expectations rather than immediately creating a formal capitalization table. You need to understand how your team plans to work before deciding whether you need formal ownership arrangements.
What should your agreement include?
Your document could cover the following:
| Section | What you should write |
|---|---|
| Project description | What you're building and what problem it solves |
| Team members | Everyone involved and their main responsibilities |
| Time commitment | How many hours each person expects to contribute |
| Decision-making | Who makes everyday decisions and which decisions require agreement |
| Expenses and revenue | How you will approve costs, track money, and discuss its use |
| Ownership expectations | Whether you intend to discuss future equity, without assuming shares already exist |
| Work product | Who creates code, designs, content, or other materials, and how their use will be handled |
| Leaving the project | What happens to responsibilities, access, and unfinished work if someone leaves |
| Review date | When you will revisit the arrangement |
When should you revisit the equity conversation?
You should revisit ownership discussions when your project becomes more serious or your team's circumstances change. For example, you might reach a point where you're collecting regular payments, thinking about registering, getting outside funding, or inviting another person to become a long-term co-founder. These changes can make formal arrangements more important. You should also review expectations when someone contributes a lot more or less than originally planned. That doesn't mean ownership must change every time someone has a busy week. It means you should address lasting changes before frustration builds.
Why is the equity conversation really about commitment?
The most important equity discussion isn't about finding the perfect percentage; it's about understanding what each person is willing to contribute over time. Two people might both love an idea, but that doesn't mean they have the same expectations about building it. You might want to work on your startup every weekend, while your friend sees it as a fun project to finish before summer break. Neither approach is wrong. The problem comes when you assume you're working toward the same goal without checking.
Equity pushes you to ask questions that can otherwise feel uncomfortable. Who will keep working when the project stops being exciting? Who will respond to customers? Who will cover unexpected expenses? What happens if someone gets an internship, moves away, or wants to leave? These questions matter even if your startup never becomes a registered company.
If you're curious about how investors evaluate founder teams and long-term business potential, our guide to internships at venture capital firms for high school students is a good starting point for exploring the investment side of entrepreneurship.
Frequently asked questions: startup equity for high school students
1. What is a cap table?
A cap table, short for capitalization table, is a record showing who owns a company's equity and how that ownership is divided. It may include founders, investors, employees, share classes, and other equity-related items. For a simple company with 100 shares, your cap table might show that you own 60 shares and your co-founder owns 40, which is a 60/40 ownership split. As a startup raises money or issues more shares, its cap table gets more complicated. For most informal student projects, you can start by recording team responsibilities and discussing intended ownership rather than building a formal cap table before a company exists.
2. Should co-founders split equity 50/50 or 51/49?
For most student teams, a 50/50 split is simpler and fairer than a 51/49 split. Some founders choose 51/49 so one person can break ties, but Y Combinator lists the need for a tie-breaker as one of the weak reasons for an unequal split. A better way to handle deadlocks is to agree in writing on who makes which decisions, such as one person leading the product and the other leading customer relationships. You can also agree on how you'll settle a major disagreement, like asking a trusted mentor for input, before one ever comes up.
3. Is startup equity worth anything?
Startup equity is only worth real money if the company becomes valuable and there's a way to turn your shares into cash, such as a sale of the company. Until then, its value is mostly on paper. Y Combinator notes that almost all startups fail, so treat equity in an early project as a possible reward rather than guaranteed money. For a student founder, the more useful question is whether your ownership arrangement is fair to everyone doing the work.
4. Is 1% equity in a startup good?
Whether 1% is good depends on the company's stage, how much it could grow, and how much work you're expected to do. For a co-founder building the business from day one, 1% would usually be far too small. Y Combinator points out that when a co-founder gets only 10% or 1%, investors may assume that person isn't very important to the business. For someone helping with a small, one-time task, though, a small share or no equity at all can be reasonable.
5. Should you give equity to someone who helps occasionally?
Usually, you shouldn't offer permanent ownership just because someone helps with a small, one-time task. If a friend designs your logo, edits a promo video, or helps you organize a launch event, you can pay them, trade services, or agree on another clearly defined arrangement instead. Equity is generally more appropriate when someone is making an ongoing contribution and taking on real responsibility for the business's future.
Final thoughts
You don't need to issue shares or register a company to start thinking seriously about equity. What you need is a clear understanding of who is building your project, what each person contributes, and what everyone expects if the business succeeds or someone decides to leave.
Start by having an open conversation with your co-founders. Write down responsibilities, agree on how you'll make decisions, and revisit those expectations as your project grows. When you're ready to formalize ownership, get advice that reflects your age, location, and business structure.
Not sure how to turn a group of friends into a team with clear roles before ownership gets messy? The Young Founders Lab Team-Based Program takes your team through 30 hours of live online workshops with expert mentors to launch a business or non-profit, and you keep full ownership of what you build. Apply here. If you'd rather start building on your own, the Individual Program pairs you one-on-one with a mentor on a flexible schedule.