A founders agreement is the document that records, while everyone still gets along, how a startup's ownership, decisions, and separations will work. At minimum it must cover the equity split, vesting with a cliff, assignment of all project intellectual property to the company, roles and decision rights, time and money commitments, and what happens when a founder leaves. Founder conflict is one of the most common reasons early ventures fall apart — ahead of technical failure — and the paradox is that fair terms can only be agreed before there is anything worth fighting over. Once the company is worth something, the same conversation is an adversarial negotiation.

This article is educational and general. Projects House is an engineering firm, not a law firm — have a startup attorney draft or review the actual document.

The Equity Split, and Why Equal Is Not Automatic

An even split is the comfortable default and often the wrong one. Ask the uncomfortable questions honestly: who brought the idea and the existing IP, who is quitting a job versus keeping one, who is putting in cash, who will work full time, and who carries which risk. An unequal split arrived at through an open conversation is far healthier than an equal split that one person privately resents.

Two structural points are easy to miss. An even number of founders with equal voting power produces deadlock, so define a tie-breaking mechanism. And whatever you agree has to be reflected in the actual stock ledger — see what a cap table is and how to split equity between co-founders for the mechanics and the common formulas.

Vesting: the Single Most Important Clause

Vesting means founder shares are earned over time rather than owned outright from day one. The conventional structure is four years with a one-year cliff — leave before the first anniversary and you keep nothing, then accrue monthly or quarterly.

Without it, a founder who leaves after six months walks away with a quarter of the company forever while the others work years on their behalf. This is not suspicion; it is mutual protection, and any future investor will insist on it anyway, as you will see when you reach the term sheet. Address acceleration on a change of control explicitly as well, so nobody assumes a payout that was never agreed.

Intellectual Property: Everything Goes to the Company

Each founder assigns to the company everything connected to the venture — the concept, the code, the CAD files, the test data, and anything created going forward. Without that clause, a departing founder can claim the core technology personally, a scenario that collapses fundraising during investor due diligence.

Confirm too that no founder carries a conflicting obligation from a current or former employer. Invention assignment agreements and employment terms frequently reach further than people assume — see who owns an invention made at work. And if outside engineering firms or contractors contributed, make sure those chains of title are clean too, as explained in who owns the IP in product development.

Roles, Decisions, and Money

  • Who holds which role. Ambiguity about who decides what is a recipe for daily friction. Name a CEO even in a two-person company.
  • Which decisions require unanimity — raising money, selling the company, taking on debt, changing the product direction — and which are simple majority.
  • Salary and draws. When compensation starts, at what level, and in what order.
  • Time commitment. Full time or alongside a job, what counts as a breach, and what the consequence is.
  • Capital contributions. Who is putting in money, whether it is equity or a loan, and what happens if a founder cannot meet a future call.

Separation Mechanisms

This is the heart of the document: what happens when a founder resigns, is removed, or the partnership simply stops working. Standard tools include a right of first refusal on share transfers, drag-along and tag-along provisions so a majority sale is not blocked or a minority stranded, a company repurchase right over unvested and sometimes vested shares, and a defined deadlock-breaking procedure. Distinguish leaving for cause from leaving without it, because the consequences should differ. A good agreement turns the worst-case scenario from a survival fight into a documented procedure.

A Living Document, Not a Drawer Document

A founders agreement is not signed once and forgotten. It gets revisited at specific junctions: a new founder joining, a financing round that layers new documents on top, a material change in roles or commitment. Build the amendment mechanism into the agreement itself — what majority is required to change it — and hold a short annual conversation asking whether the split still reflects reality. That conversation, held while there is no crisis, prevents the quiet accumulation of resentment that dissolves partnerships.

Also understand the document hierarchy. After a financing round, the charter and the investment documents govern, so at every round confirm that your internal agreements were carried into the new paperwork rather than quietly overwritten. Employee equity is the next layer of the same structure — see employee stock options at a startup.

How to Actually Do It

Conversation first, document second. The founders work through the hard questions themselves, reach agreement in principle, and only then have an attorney draft it — a focused document, not a fifty-page contract nobody reads. Decide the entity question in the same pass, since a founders agreement presupposes something to own shares in; see LLC vs sole proprietorship for inventors. For the wider context of building a hardware company with partners, see our startup hub and why hardware startups fail.

Once the ownership questions are settled, the next ones are engineering: what has to be built, what it will cost, and how long it takes. If you want that grounded before you commit, tell us about your product through our contact form.