Offer Letter vs Employment Agreement: What's the Difference?

When a company makes you a job offer, you'll typically receive multiple documents at different stages of the process. Many people treat the offer letter as "the offer" and sign everything else on autopilot. That's a mistake — because the employment agreement, PIIA, and other documents that come after contain some of the most consequential terms of your employment. Here's how to think about each document and what it actually covers.

What the Offer Letter Covers

The offer letter is typically a 1-2 page document that summarizes the business terms of your employment. It's the document that tells you:

• Your title and role
• Start date and reporting structure
• Base salary
• Annual bonus target (if applicable)
• Equity grant (typically a summary: number of RSUs or options, vesting schedule overview)
• Signing bonus (if applicable), with a reference to repayment terms
• High-level benefits overview

The offer letter is designed to confirm that you and the employer are aligned on the key economic terms before you proceed. It's often the document you sign first — before the longer employment agreement.

What the offer letter generally does not cover: your post-employment obligations. The non-compete, confidentiality requirements, IP assignment, and dispute resolution provisions are typically not in the offer letter. They're in the employment agreement and related documents.

What the Employment Agreement Covers

The employment agreement is the legal document that governs the terms and conditions of your employment, including — and this is the part most people skip — what you're obligated to do and not do after employment ends.

Key sections of the employment agreement:

• At-will employment: Confirmation that employment is at-will (in most states).
• Compensation and benefits: Sometimes a repeat of the offer letter terms, sometimes just a reference to a separate offer letter.
• IP assignment / PIIA: The invention assignment and confidentiality provisions (sometimes incorporated by reference to a separate PIIA document).
• Non-compete: Duration, geographic scope, and restricted activities.
• Non-solicitation: Restrictions on recruiting former colleagues or contacting former clients.
• Confidentiality: Scope and duration of post-employment confidentiality obligations.
• Dispute resolution: Arbitration, class action waiver, and governing law.
• Termination: What happens to compensation and equity upon various types of termination.

The employment agreement is the document that defines your long-term obligations. Most of its provisions operate primarily after employment ends.

When They Conflict

When the offer letter and employment agreement contain conflicting provisions, the general rule is that courts look at the totality of the documents and apply principles of contract interpretation. The more specific document typically controls over the more general one; the later document typically controls over the earlier one.

This can create issues if your offer letter says one thing and the employment agreement says something different. Example: the offer letter says your signing bonus vests over 12 months; the employment agreement's clawback provision says repayment is required for 24 months. Which controls?

The answer is that the more specific, later document likely governs on the specific term. But ambiguity here is common and should prompt a question before signing. Don't assume the offer letter's better terms will prevail over the employment agreement's more restrictive ones.

The Other Documents: PIIA, Equity Plan, Arbitration

Beyond the offer letter and main employment agreement, you'll typically sign a stack of additional documents:

PIIA or Invention Assignment Agreement: The proprietary information and inventions agreement. This governs IP assignment and may contain the primary confidentiality provisions. It's often the most important document for engineers with side projects.

Equity plan documents: Your RSU grant notice or stock option agreement, plus the company's equity plan document (which contains the governing terms for all equity grants). The grant notice has your specific numbers; the plan document has the mechanics.

Arbitration agreement: Some companies present arbitration as a separate standalone document rather than embedding it in the employment agreement. The practical effect is the same, but it may be presented on a separate signature page.

Bonus plan documents: If there's an annual or performance bonus, there may be a separate document governing the plan terms, including the conditions under which you earn the bonus and how it's calculated.

All of these documents are part of your employment package. They all contain enforceable terms. Reading only the offer letter means you've read perhaps 10% of the legal framework governing your employment.

Ask for Everything Upfront

This is perhaps the most practical piece of advice in this post: request all employment documents at the same time, before you accept anything.

Many employers present documents sequentially: the offer letter arrives first, you sign it to accept the offer, and then the employment agreement and PIIA arrive two days before your start date. This sequencing creates pressure. You've accepted the offer, you may have already resigned from your prior job, and now declining the employment agreement on day one would create enormous disruption.

To avoid this: when you receive the offer letter, respond positively but ask to receive all the documents you'll be required to sign before your first day — the employment agreement, PIIA, equity plan documents, and any arbitration agreement. Review them as a complete package before accepting. This is a completely reasonable request and most employers will accommodate it.

What to Review in Each Document

A quick summary of focus areas:

• Offer letter: Base salary accuracy, equity grant specifics, signing bonus terms and clawback reference.
• Employment agreement: Non-compete scope and duration, confidentiality duration, dispute resolution, termination and severance.
• PIIA: Invention assignment scope, confidentiality definition, prior inventions schedule.
• Equity documents: Share count, grant date, vesting schedule, post-termination exercise window (for options), acceleration provisions.

The Bottom Line

Your offer letter is the beginning of the document stack, not the end. The employment agreement and PIIA contain the terms that will matter most after your tenure ends. Before signing anything in your employment package, paste the full set of documents into dott.legal for a free AI risk analysis. For situations involving complex IP, non-competes, or significant equity, attorney-validated review is $349 with 24-hour turnaround.