Five Legal Mistakes Seed-Stage Startups Make

I have worked with over a hundred VC-backed startups at this point. The pattern is almost always the same. Smart founders, good product, real traction. And a handful of legal mistakes that could blow up the cap table, kill a deal, or create a liability no one saw coming.

These are not exotic problems. They are the boring, avoidable ones that show up in almost every early-stage company I work with. The kind of stuff that feels like a low priority when you are heads down building, but becomes a very high priority the moment an investor starts asking questions.

Here are the five I see most often, and what the fix looks like for each one.

1. Skipping Proper IP Assignment at Formation

This one kills deals. I have seen it happen more than once.

Here is the scenario. Two founders build a product together. They incorporate, split equity, maybe even raise a little money. But nobody ever signed an IP assignment agreement. Which means the company does not actually own the thing it is selling.

Investors will catch this in diligence. And when they do, it is not a "fix it and move on" situation. It is a "we need to pause the entire round while lawyers sort out who owns what" situation.

The worst version? A co-founder who left early and never assigned their IP. Now you need their signature to clean it up, and they want something for it.

The fix is simple and boring: every founder signs a proper IP assignment at formation. Not a contractor agreement. Not a handshake. A real assignment that transfers all prior and future work product to the company.

Same goes for early contractors and employees. If someone writes code, designs a product, or creates anything the company will use, get the assignment signed before the work starts. The cost of doing this right on day one is maybe a few hundred dollars. The cost of fixing it later can be a blown term sheet.

2. Using a SAFE Without Understanding the Conversion Math

SAFEs are great. They are fast, clean, and founder-friendly. But "simple" does not mean "nothing to think about."

I regularly sit down with founders who have raised on two or three SAFEs and cannot tell me what their cap table will look like after conversion. That is a problem. Because the investors who gave you that money absolutely know what it should look like.

Here is where it gets tricky. Valuation caps, discount rates, MFN provisions, pre-money vs. post-money SAFEs. Each one changes the math. Stack a few of them together and you can end up with way more dilution than you expected.

The most common surprise: founders who raise $1M on post-money SAFEs with a $5M cap, then raise a $10M Series A, and cannot figure out why they own less than they thought. The answer is usually that they did not model the conversion before they signed.

The fix: run the conversion math before you sign any SAFE. Not after. Not when you are raising your priced round. Before.

Build a simple model. Or better yet, ask your lawyer to walk you through it. If your lawyer cannot explain your SAFE conversion in plain English, that is a different problem.

3. Treating Your Cap Table Like a Napkin Sketch

I have seen cap tables managed in Google Sheets with broken formulas. On whiteboards. In email chains. Once, on an actual napkin (not kidding).

Here is why this matters: your cap table is not a nice-to-have document. It is the single source of truth for who owns what. And when it is wrong, everything downstream breaks.

Wrong cap table means wrong pro forma for your next raise. Means wrong option grants. Means an investor's counsel spending three weeks reconciling your numbers during diligence instead of closing the deal.

The most painful version: a founder who promised equity to five early employees but never formalized the grants. Now they are raising a Series A and the cap table has phantom obligations nobody accounted for.

The fix: maintain a clean, current cap table from day one. That means every equity issuance, every option grant, every SAFE, every note. Documented, tracked, reconciled.

You do not need expensive cap table software on day one. A well-built spreadsheet works fine at the seed stage. But it has to be accurate, and someone has to own it.

4. Never Having the Co-Founder "What If" Conversation

Nobody wants to talk about a breakup at the beginning of a relationship. I get it. But startups are not marriages. They are business partnerships with real money at stake.

What happens if a co-founder leaves after six months? What about their equity? What about their board seat? What about the IP they worked on?

If you do not have a founders' agreement that covers vesting, departure triggers, and IP ownership, you are betting your entire company on the hope that things work out. I have seen messy co-founder splits crater otherwise great companies.

The fix: have the conversation early. Put vesting on all founder shares. Define what happens if someone leaves. Write it down. Sign it. It is uncomfortable for about an hour. Skipping it can be uncomfortable for years.

5. Waiting Until Diligence to Fix Things You Knew Were Broken

This one is the most frustrating because founders usually know. They know the option grants are not documented. They know the contractor did not sign an agreement. They know the board minutes have not been updated in two years.

But fixing it feels like a cost with no upside. Until an investor's counsel sends over a diligence request list and suddenly every shortcut becomes a deal risk.

The pattern I see: founders spend six months building toward a raise, then spend the first three weeks of the raise scrambling to clean up legal housekeeping that should have been done all along.

The fix: treat legal hygiene like a recurring task, not a one-time cleanup. Set a quarterly reminder to review your corporate records, update your cap table, and make sure your agreements are signed and filed. The companies that raise fastest are the ones that are always ready.

The Bottom Line

None of these mistakes are hard to fix if you catch them early. All of them are expensive to fix if you do not.

The through line is the same: do the hard, boring work early. Have the tough conversations. Sign the agreements. Keep the records. It is not glamorous. But it is the difference between a clean close and a deal that dies on the table.

If any of this sounds familiar, you are not alone. These are the most common patterns I see across hundreds of deals. The good news is that every one of them is fixable, and the earlier you start, the cheaper and easier it gets.