The most common legal traps for startups include relying on handshake deals, skipping written founder agreements, failing to assign IP to the company, making verbal promises that never hit paper, and using SAFEs without clear terms. These gaps matter because they are hard to unwind once money, value, and emotions are on the line. 

Many early teams assume they can “paper it later.” The problem is that later usually arrives during a dispute or investor diligence, when options are limited, and leverage may have already shifted. 

Handshakes, Founders, and IP Ownership 

Handshake agreements and informal founder understandings can be legally binding, but they are difficult to prove and rarely helpful when things go sideways. You also can’t safely backdate a founder agreement to fix past decisions. On top of that, if IP isn’t assigned in writing, the company probably doesn’t own it—individual founders, employees, or contractors might. Clean, dated agreements are the only reliable way to show who owns what and on what terms. 

Verbal Promises and Diligence Gaps 

Verbal promises don’t show up in due diligence. If you have informal revenue shares, side promises, or handshake equity deals, investors will either discount the company or insist on a painful clean-up. Putting commitments into consistent, lawyer-reviewed documents gives everyone the same source of truth and reduces surprises when a buyer or fund digs in. 

SAFEs, Terms, and Future Rounds 

SAFEs and similar instruments can be useful, but they are not simple when there’s no clarity on valuation caps, discounts, or side letters. Stacked, inconsistent SAFEs make it harder to model dilution and negotiate future rounds. Founders should standardize their fundraising terms early, keep a clear cap table, and avoid one-off promises that are hard to reconcile later. Protect the business you’re building before the paperwork becomes the problem.