Contracts Explained: What Every Founder Needs to Know
A contract is a legally binding agreement between two or more parties that creates enforceable obligations. For founders, contracts are the infrastructure of every business relationship — with co-founders, employees, customers, vendors, investors, and partners. Understanding contracts is not about becoming a lawyer; it is about protecting your business and avoiding costly misunderstandings.
Definition: A contract is a legally enforceable promise or set of promises. For a contract to be valid, it must have: (1) an offer, (2) acceptance, (3) consideration (something of value exchanged), (4) capacity (all parties are legally able to enter contracts), and (5) legality (the purpose must be lawful).
What Makes a Contract Legally Binding?
Five elements must be present:
- Offer: One party proposes specific terms. "I will build your website for $5,000 within 30 days."
- Acceptance: The other party agrees to those exact terms. A counter-offer is not acceptance — it is a new offer.
- Consideration: Each party must give something of value. Money for services, equity for labor, access for data. A one-sided promise without consideration is generally not enforceable.
- Capacity: All parties must be of legal age and sound mind. Corporations and LLCs enter contracts through authorized representatives.
- Legality: The contract''s purpose must be legal. You cannot enforce a contract for illegal services.
Contrary to popular belief, contracts do not need to be written to be legally binding — oral contracts are enforceable in many situations. However, certain contracts must be in writing under the Statute of Frauds: contracts involving real estate, agreements that cannot be performed within one year, and contracts for goods over $500 (under the UCC). Always put agreements in writing regardless — enforcing an oral contract is expensive and uncertain.
Essential Startup Contracts
Co-Founder Agreement
The most important and most frequently skipped contract. It should cover: equity split and vesting schedule, roles and responsibilities, decision-making process, what happens if a co-founder leaves (voluntarily or involuntarily), IP assignment, non-compete terms, and dispute resolution. Get this done at incorporation — doing it later, after disagreements arise, is exponentially harder. To understand how co-founder agreements relate to company formation, see our guide on legally starting a business.
Employment Agreements
Every employee should sign an agreement covering: compensation and benefits, job description and expectations, at-will employment status (in the US), confidentiality obligations, IP assignment (all work product belongs to the company), non-solicitation clauses, and any non-compete restrictions (note: the FTC has moved to ban most non-competes). For more on the hiring process, see our hiring guide.
Contractor / Freelancer Agreements
Critical difference from employment: contractors own their work product by default unless the contract explicitly assigns IP to you. Every contractor agreement must include: scope of work, payment terms, IP assignment clause, confidentiality provisions, and independent contractor status confirmation (to avoid misclassification risk).
Non-Disclosure Agreement (NDA)
Protects confidential information shared between parties. Can be one-way (only one party shares secrets) or mutual (both parties share). NDAs should specify: what constitutes confidential information, the duration of the obligation (typically 2–5 years), permitted disclosures (e.g., to employees who need to know), and exclusions (publicly available information, independently developed knowledge). See our IP basics guide for more on protecting trade secrets.
SaaS Terms of Service / EULA
Your customer-facing contract governing how users interact with your product. Key elements: acceptable use policy, data privacy and handling, service level commitments (uptime), limitation of liability, payment terms and refund policy, and termination rights. Use established templates from providers like Termly or iubenda for basic SaaS ToS, but have a lawyer review before launch.
Partnership / Vendor Agreements
Any business relationship with another company should be documented: scope of the partnership, revenue sharing or payment terms, responsibilities of each party, exclusivity (or non-exclusivity), term and termination rights, and liability allocation.
Term Sheets / Investment Agreements
When raising capital, the key documents are: the term sheet (outlines deal terms — not legally binding except for specific clauses like exclusivity), the SAFE or convertible note (for early-stage rounds), and preferred stock purchase agreements (for priced rounds). Y Combinator''s standard SAFE documents have become the industry standard for pre-seed and seed rounds.
Key Contract Clauses Every Founder Should Understand
Indemnification
An indemnification clause requires one party to cover the losses of the other party in specific situations. For example: "Company A will indemnify Company B for any claims arising from Company A''s negligence." Watch for overly broad indemnification that could expose you to unlimited liability for things outside your control.
Limitation of Liability
This clause caps the maximum amount one party can be liable for. Common structures: liability limited to the total fees paid under the contract in the last 12 months, or a fixed dollar amount. Without this clause, your potential liability is unlimited. Always include one.
IP Assignment
Specifies who owns intellectual property created under the contract. For employees and contractors: the company should own all work product. For partnerships: clearly define who owns jointly created IP. Ambiguous IP ownership is the most common source of startup legal disputes.
Non-Compete / Non-Solicitation
Non-competes restrict someone from working for a competitor. The FTC has proposed banning most non-competes for employees, and several states (California, notably) already refuse to enforce them. Non-solicitation clauses (preventing someone from poaching your employees or customers) are generally more enforceable and often more useful.
Termination
Every contract should specify: how either party can end the agreement, notice period required (30, 60, 90 days), what happens to work in progress upon termination, and whether there are penalties for early termination. Avoid contracts with no termination clause — they can trap you in unfavorable agreements indefinitely.
Governing Law and Dispute Resolution
Specifies which jurisdiction''s laws apply and how disputes will be resolved — through courts, arbitration, or mediation. For US startups, Delaware or your home state are common choices. Arbitration is typically faster and cheaper than litigation but offers limited appeal rights.
Templates vs. Lawyers: When to Use Each
| Use Templates When | Hire a Lawyer When |
|---|---|
| Standard NDA for preliminary discussions | Co-founder agreement with custom terms |
| Basic contractor agreement for small projects | First employee stock option plan |
| Standard SaaS ToS for early-stage product | Enterprise customer contracts over $50K |
| Simple vendor agreements under $10K | Investment documents (SAFE, convertible note, priced round) |
| Mutual NDA with standard terms | Licensing your technology to another company |
Good template sources: Y Combinator (SAFEs, sales agreements), Clerky (incorporation docs), Orrick''s Start-Up Forms Library, and AVODOCS (free contract templates). Always read templates fully and customize them — never sign a template you do not understand.
Contract Management Tips
- Store all signed contracts in a centralized, searchable system (Google Drive folder, DocuSign, or a tool like Ironclad)
- Track renewal dates and termination windows — auto-renewals can lock you into bad deals
- Keep a contract register: a spreadsheet listing every active contract, counterparty, key dates, and value
- Review all contracts before signing — even if they are "standard." The other party''s standard is designed to protect them, not you
- For important contracts, have your co-founder or advisor review even if you cannot afford a lawyer
Key Takeaways
- Every significant business relationship should be documented in a written contract
- Co-founder agreements and IP assignment are the two most critical early-stage contracts
- Always include limitation of liability and termination clauses
- Contractors do not automatically assign IP — explicit assignment clauses are required
- Use templates for standard agreements; hire lawyers for complex, high-stakes contracts
- Maintain a contract register and track renewal dates proactively
Frequently Asked Questions
Is a verbal agreement legally binding?
In many cases, yes. Oral contracts are enforceable if they meet all five elements (offer, acceptance, consideration, capacity, legality). However, they are extremely difficult to prove in court because there is no written record of the terms. The Statute of Frauds requires certain contracts to be in writing. Best practice: always put agreements in writing, even informal ones. A simple email confirming the terms can serve as a written record.
What makes a contract unenforceable?
Common reasons: lack of consideration (one-sided promises), duress or coercion, fraud or misrepresentation, unconscionable terms (so one-sided that a court finds them unfair), lack of capacity (a minor or mentally incapacitated person), and illegality. Contracts can also be voided for mutual mistake — both parties were wrong about a fundamental fact.
Do I need a contract for every freelancer I hire?
Yes, without exception. Even for a $500 logo design project. The contract does not need to be long — a one-page agreement covering scope, payment, timeline, and IP assignment is sufficient. Without a written IP assignment, the freelancer owns the work they create, and you only have an implied license to use it. This can create serious problems later, especially during investor due diligence.
Can I modify a contract after it is signed?
Yes, through a written amendment or addendum signed by all parties. You cannot unilaterally change a contract. Some contracts include a "modifications" clause specifying that changes must be in writing and signed by both parties — this prevents one side from claiming an oral modification was agreed upon. Always document changes formally.
What is the difference between an MOU and a contract?
A Memorandum of Understanding (MOU) is typically a non-binding document that outlines the intent and framework of a business relationship. A contract is legally binding and enforceable. However, the distinction is not always clear — courts look at the substance, not the title. If an MOU has specific terms, consideration, and clear intent to be bound, a court may treat it as an enforceable contract. When in doubt, clearly state whether a document is intended to be binding or non-binding.