5 founders agreement mistakes that destroy startups.

In two decades of representing Austin founders, I have seen exactly one co-founder breakup that wasn't, in some way, traceable to the founding documents. The others — every single one — had a clause that was missing, vague, or copied from a template the founders never read.

This is the short list. Five things to get right before you sign the documents that govern the most important business relationship you have.

Mistake 1: No vesting on founder equity

The most common founders-agreement error in early-stage Texas startups is the simplest one: founders issue themselves 100% of the equity upfront, with no vesting and no buy-back. Then one founder leaves three months later — to take another job, because the marriage isn't working, or because the two of you can't agree on direction — and walks away with a meaningful chunk of the company that the remaining founders now have to either negotiate back or live with on the cap table forever.

Investors will require vesting before they fund you. The question is whether you've already given away leverage by the time the conversation comes up.

The fix

Standard founder vesting in Texas startups looks like a four-year monthly vest with a one-year cliff, subject to repurchase at the lower of cost or fair market value if a founder departs. For founders contributing meaningful pre-formation work, build in a vesting credit for the months already worked — typically capped at six to twelve months. Also include:

• Double-trigger acceleration on change of control (termination without cause within a defined window after the sale).
• Clear "for cause" definitions tied to specific conduct, not vibes.
• An 83(b) election filed with the IRS within 30 days of the equity grant. This is the deadline that has no extensions and no exceptions.

Mistake 2: Vague decision rights

The second pattern: equal co-founders, no operating agreement, no allocation of decision rights. Then the founders disagree on a hire, a fundraise, a pivot, or a customer concession. There is no mechanism to break the tie, and the disagreement metastasizes into a deadlock that lawyers eventually have to unwind.

"We trust each other" is not a decision rule. It is a description of the relationship before the first hard decision tests it.

The fix

Spell out, on paper:

• Ordinary-course decisions — who has signing authority for routine operations, up to what dollar threshold, in what categories.
• Major decisions requiring unanimous or supermajority approval — typically: fundraising, M&A, taking on debt above a threshold, hiring or firing officers, changing the business plan materially, dissolving the company, amending the governing documents.
• A tiebreaker — a designated CEO with a casting vote, a neutral board member, mandatory mediation followed by a buy-sell trigger, or another mechanism with a clear sequence. Pick one. Write it down.

Mistake 3: No buy-sell on departure, death, or disability

What happens to a founder's equity if they die, become disabled, get divorced, file for bankruptcy, or simply quit? Without a buy-sell agreement, the answer is: their stock or units pass to their estate, ex-spouse, trustee, or creditor — who is now your partner in the business.

"Most founders find it easier to negotiate the buy-sell terms when nobody knows which side they will be on. The asymmetry shows up the moment a triggering event occurs."

The fix

A real buy-sell provision in your operating agreement or shareholders agreement covers, at minimum:

• Triggering events — death, disability lasting longer than a defined period, bankruptcy, divorce decree affecting the equity, termination of employment with or without cause, voluntary withdrawal.
• Valuation mechanism — formula, agreed-annual figure with reset rules, or third-party appraisal with a defined methodology.
• Funding mechanism — cross-purchase, redemption, life insurance funding, installment notes with reasonable terms.
• Rights of first refusal on any proposed transfer to a third party, with a meaningful response window.

Mistake 4: IP assignment gaps

Two patterns here, both bad. First, founders contribute work created before formation — the prototype, the early codebase, the brand — and never formally assign it to the company. Second, founders or early contractors do work after formation under "we'll figure it out later" handshakes, and the assignment paperwork is missing when due diligence happens.

The acquirer or Series A lead will find these gaps. They always do.

The fix

Two documents, signed by every founder and every contributor:

• Contribution and IP assignment agreement at formation, assigning all pre-formation work product, code, designs, content, customer lists, and other IP related to the business to the company. Include a representation that the contributor has the right to assign it (i.e., it's not still owned by a prior employer).
• Proprietary information and inventions assignment (PIIA) for ongoing work, signed by every employee and contractor before they begin. For Texas employees, pair this with confidentiality and reasonable non-solicitation language; tread carefully on non-competes given current federal and state law developments.

Mistake 5: Skipping the operating or shareholders agreement entirely

The Texas Secretary of State will happily file your certificate of formation and let you operate without an operating agreement (for an LLC) or a shareholders agreement (for a corporation). The Texas Business Organizations Code will then fill in default rules — written by the legislature, not by you — for every governance and economic question you didn't answer.

The defaults are not designed for your specific deal. They are designed to apply to every entity in Texas. They will almost never match what you actually intended.

The fix

A baseline operating or shareholders agreement that addresses, at minimum:

• Capital contributions and how additional capital calls work.
• Profit and loss allocations and distribution priorities.
• Management structure (member-managed vs. manager-managed, officer roles, board composition).
• Voting thresholds for ordinary and major decisions.
• Transfer restrictions, rights of first refusal, drag-along and tag-along rights.
• Vesting, repurchase, and the buy-sell terms above.
• Confidentiality, non-solicitation, and assignment of inventions.
• Dispute resolution — venue (Travis County or another Texas county), governing law, mediation-then-arbitration sequence if you prefer to stay out of court.
• Amendment procedure — what supermajority is required to change any of the above.

This article is general information and is not legal advice. If you are forming a Texas company or revising the documents on an existing one, the Sterling & Hayes founders practice is available to schedule a consultation.