Co-founder relationships end badly when things aren’t documented. You might trust each other completely right now, but memories fade, circumstances change, and what seemed obvious becomes contested. Getting founder agreements in place early isn’t about distrust—it’s about clarity. And it’s far easier to do when everyone’s excited than when there’s a dispute.
Why Documentation Matters
•
Provide reference when memories differ
Investors require clean documentation:
Messy documentation kills deals.
•
Company direction changes
Documentation provides framework for handling these.
Essential Founder Documents
The partnership terms between founders:
•
Roles and responsibilities
•
Decision-making authority
•
What happens if someone leaves
Stock Purchase Agreements
•
Price paid (usually nominal)
Transfer all relevant IP to the company:
•
Prior work related to the business
Ensures company owns the IP.
Confidentiality Agreement
Protect company information:
Restrictions on competing or poaching:
•
Enforceability varies by state
How ownership is divided:
•
Percentage or share counts
See Founder Equity Splits article for guidance.
How equity is earned over time:
•
Monthly or quarterly after cliff
•
Single trigger (change of control)
•
Double trigger (change of control + termination)
•
Protects against early departure
•
Decision-making authority
•
What requires unanimous consent
•
What can one founder decide
What happens if a founder leaves:
•
Unvested returns to company
•
Process for determination
Ensuring company owns what it needs:
What must be kept confidential:
•
Non-solicitation of employees
•
Non-solicitation of customers
How to handle disagreements:
•
Arbitration vs. litigation
Tax election for restricted stock:
•
Pay taxes now on current value
•
Avoid paying taxes on future appreciation
Without 83(b):
Stock vests → taxed on value at vesting → could be huge tax bill
With 83(b):
File within 30 days → taxed on value at grant → usually nominal
2.
Mail to IRS within 30 days
30-day deadline is absolute. No extensions. No exceptions.
Set calendar reminder. File immediately. Track proof of mailing.
Before writing code or talking to customers:
•
At minimum, email confirming equity split
When you formally incorporate:
•
Stock purchase agreements
Before investors come in:
•
Ensure all assignments complete
•
Resolve any open questions
•
Record significant decisions
Common Documentation Mistakes
“We’ll figure it out as we go.”
Problem: Memories differ, disputes arise.
Fix: Paper it early, even informally.
Vesting for some founders, not others.
Problem: Unequal treatment, resentment.
Fix: All founder equity should vest.
Built things before incorporating or without assignment.
Problem: Unclear ownership, investor concerns.
Fix: Retroactive assignment, proper agreements going forward.
Didn’t file or filed late.
Problem: Potential massive tax bill.
Fix: File immediately. No exceptions.
Didn’t address what happens if someone leaves.
Problem: Dispute when it happens.
Fix: Define departure scenarios explicitly.
Original agreement, never updated.
Problem: Doesn’t reflect current reality.
Fix: Review and amend as needed.
•
Significant capital at stake
•
Initial term sheet discussions
•
Understanding what you need
•
Simple email confirmations early on
•
Agree on terms before engaging lawyers
•
Use startup-focused firms/services
•
Templates for standard provisions
•
Lawyers for review, not drafting from scratch
•
YC’s SAFE and post-money templates
•
Clerky’s standard documents
•
Document founder relationships early—it’s easier when everyone’s excited
•
Essential documents: founder agreement, stock purchase, IP assignment, confidentiality
•
Vesting protects everyone: 4 years with 1-year cliff is standard
•
Define what happens when founders leave (voluntary and involuntary)
•
83(b) election must be filed within 30 days—no exceptions
•
Decision-making authority should be explicit
•
Update documents as things change; original agreement shouldn’t be frozen
•
Clean documentation enables fundraising; messy documentation kills deals
•
Use templates and services for standard situations; lawyers for complex ones
•
When in doubt, write it down—verbal agreements lead to disputes