OfficialUSCIS, I-9 Central · Last verified
An offer letter and an employment agreement are not the same document
One announces terms. The other creates obligations, some of which outlive the job. Both usually arrive in the same week and get signed in the same five minutes.
What an offer letter usually does
An offer letter typically states the job title, the start date, the pay rate and how often it is paid, whether the role is full time or part time, whether it is exempt or non-exempt for overtime purposes, and who you report to. It is short, and it is mostly a summary of what was agreed verbally. It is generally not a guarantee of employment for any period.
Source: USCIS, I-9 Central
The conditions are how an offer gets withdrawn
Most United States offers are conditional, and the conditions are the part people skim. A background check, references, and satisfactory completion of Form I-9 are the usual three. Form I-9 is the employer's verification of your identity and your authorisation to work, completed within the first days of employment. One detail worth knowing: you choose which acceptable documents to present from the published lists. An employer may not specify which ones you must produce.
Source: USCIS, I-9 Central
What an employment agreement may add
A separate agreement may add confidentiality, assignment to the company of intellectual property you create, non-solicitation of staff and clients, and an arbitration clause deciding how any dispute is resolved. It may add repayment terms for training, relocation or immigration costs if you leave within a set period. In a staffing arrangement it may add a conversion fee or a bar on the client hiring you directly. The parts intended to survive the job usually do: confidentiality and intellectual property terms typically outlast termination.
Source: USCIS, I-9 Central
Non-competes are a question of state law again
The Federal Trade Commission rule that would have banned most non-compete clauses was set aside by a federal court, and in September 2025 the Commission acceded to that vacatur and dismissed its appeals. The Commission's own page records that the rule is not in effect and is not enforceable. Enforceability is therefore governed by state law, and states differ enormously in what they will enforce and against whom. If an agreement in front of you contains one, the question is what your state does with it.
Source: USCIS, I-9 Central
At will, and what it means here
Most offer letters state that employment is at will, meaning either side can end it at any time for any lawful reason. If you are used to a system with statutory notice periods, probation rules and defined grounds for dismissal, none of that is the default here. Where notice or severance matters to you it has to be written into the document, because it will not be implied. Employment law in the United States is substantially state law, so the same clause can behave differently in different states.
Source: USCIS, I-9 Central
Sponsorship language is not a guarantee
An employer can state an intention to sponsor and that is a reasonable thing to ask for in writing. It is not a guarantee of a visa. Cap-subject H-1B selection runs through a registration process and a numerical limit set by Congress, and the outcome is not something an employer controls. Any promise that treats selection as certain should be read as a warning sign rather than as reassurance.
Source: USCIS, I-9 Central
Before you sign
Get the legal entity name of the employer. Establish whether the role is W-2 or 1099 in writing. Read every condition the offer depends on. Read the employment agreement, not only the offer letter. Identify any repayment or clawback clause and what triggers it. Ask what notice applies if the role ends. Do not resign from anything, sign a lease, or decline another offer until the conditions have cleared in writing.
Source: USCIS, I-9 Central
Common mistakes
Treating the offer letter as the whole contract when a longer agreement follows. Signing the agreement without reading the intellectual property and repayment clauses, both of which can outlast the job. Resigning from a current role before the new employer's conditions have cleared. Reading a sponsorship sentence as a commitment about an outcome nobody controls.
Source: USCIS, I-9 Central
Official
Frequently asked questions
- Can an employer withdraw an offer after I accept?
- Where the offer is conditional, failing a stated condition is the ordinary route by which that happens, which is why the conditions are worth reading. Beyond that, employment in most states is at will, and the position varies by state and by what the documents say. If an offer is withdrawn after you have resigned from something, take advice on your own facts.
- Do I have to give the employer specific documents for Form I-9?
- You choose which acceptable documents to present from the published lists. An employer may not demand particular documents or reject valid ones that reasonably appear genuine.
- Is a verbal offer binding?
- Treat it as a strong indication and nothing more. Numbers discussed verbally move, and the written offer is what the company will act on. Ask for it in writing before making any decision that costs you something.
- Should I have somebody read the agreement?
- For anything containing a non-compete, a repayment clause, or immigration commitments, an employment lawyer reading it once is proportionate to what it can cost. This is separate from immigration advice, which is a different speciality.