Offer letter versus employment agreement

OctoDoc, the signing system of record, files an offer letter and an employment agreement as two instruments with different jobs: the letter records an offer and its acceptance, and the agreement governs the relationship that follows. The legal background both are drafted against is the same. The National Conference of State Legislatures states it in two sentences: "Employment relationships are presumed to be “at-will” in all U.S. states except Montana." and "At-will means that an employer can terminate an employee at any time for any reason, except an illegal one, or for no reason without incurring legal liability."

The two instruments take opposite positions toward that default. An offer letter preserves it: its at-will paragraph and its no-fixed-term sentence exist so that nothing in the letter reads as a promise of tenure. An employment agreement modifies it: a stated term, a for-cause termination standard, notice periods and severance are all contract terms that replace the default with something negotiated. Most United States hires sign only the letter; the negotiated agreement is the executive and specialist instrument.

This page describes two classes of instrument. It is not a substitute for the advice of an attorney.

The offer letter's peculiar risk is becoming the other instrument by accident. The NCSL overview records that courts have carved exceptions into the at-will presumption, and names them: "The three major common law exceptions are public policy, implied contract, and implied covenant of good faith." The implied-contract exception is the one a letter can trigger with its own text — an annual salary stated with no per-period equivalent, a role described as permanent, or a disciplinary procedure laid out step by step each read as promised terms the employer did not intend to promise.

An employment agreement has no such exposure, because it is exactly what the letter must avoid resembling: a negotiated contract in which promised terms are the point. Its compensation clause also has a regulatory floor to respect for exempt roles — 29 CFR 541.602 requires the pay to arrive as “a predetermined amount constituting all or part of the employee's compensation, which amount is not subject to reduction because of variations in the quality or quantity of the work performed” — which is a drafting constraint on how salary, deductions and clawbacks can be worded in either instrument.

The two documents also carry different companions. A letter travels with a separate confidentiality and invention-assignment agreement it names as a contingency; an employment agreement commonly folds those covenants, and any restrictive covenants state law allows, into its own text.

The expensive error runs in one direction. Promissory language belongs in an employment agreement, where its limits — cause definitions, cure periods, a severance cap, an integration clause — are drafted beside it. The same language in an offer letter arrives with none of those limits, and under the implied-contract exception it can bind anyway: the employer has then made the agreement's promises without the agreement's protections.

The record of signing settles the narrower disputes. A countersigned letter sealed with the acceptance date on its face answers whether the offer was taken inside its own deadline, and a sealed employment agreement fixes which version of a negotiated draft was actually executed — the question that matters when three redlines circulated and severance is later claimed from the wrong one. A third party can check the sealed digest of either at /verify with no account.

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