Writing a compliant job offer in the United States
Reviewed by Mellow Editorial Team, HR & payroll content team
A compliant US job offer letter sets out the key terms of employment clearly, avoids language that could accidentally create a contract where none was intended, and stays within federal and state law. Get these elements right before you send anything to a candidate.
Decide what you are actually offering
Before you draft a single sentence, confirm three things internally: the classification (employee or independent contractor), whether the role is exempt or non-exempt under the Fair Labor Standards Act, and the pay structure.
Classification matters because it determines every downstream obligation — payroll taxes, benefits eligibility, and how you end the relationship. Getting it wrong is expensive. FLSA exempt status turns on salary level and the nature of the job duties; non-exempt employees are entitled to overtime pay.
Pay structure also affects what you must disclose. Some states and cities now require salary ranges in job postings or offer letters. Check the law in the state where the employee will work, not where your company is headquartered.
Draft the core terms
A compliant offer letter should include:
Job title and reporting line. Be specific. Vague titles create ambiguity later.
Start date. State a specific date or a condition (for example, "subject to a satisfactory background check").
Compensation. State the base salary or hourly wage clearly. For salaried employees, specify the pay period (bi-weekly, semi-monthly). If there is a bonus, describe how it is calculated and note that it is discretionary unless you intend to make it contractually binding.
Benefits summary. You do not need to reproduce the full plan documents here, but briefly naming health insurance, retirement plan, and paid time off sets expectations. Note that there is no federal requirement for paid annual leave or paid sick leave — what you offer is a business decision, though some states and cities mandate a minimum.
FLSA status. State whether the role is exempt or non-exempt. This is not just good practice; it removes ambiguity about overtime eligibility from day one.
Conditions precedent. List anything that must happen before employment begins — background check, reference checks, I-9 verification, drug screening if applicable.
At-will statement. This is arguably the most legally significant line in the letter. Employment in the United States is generally at-will, meaning either party can end the relationship at any time for any lawful reason. Your offer letter must say this explicitly, and it should appear in plain language, not buried in fine print.
Watch the language carefully
The at-will relationship is easily undermined by careless phrasing. Avoid any language that implies job security, a guaranteed term, or dismissal only "for cause" unless that is genuinely what you intend. Phrases like "permanent position," "as long as performance is satisfactory," or "we look forward to a long career together" have been used in litigation to argue an implied contract.
Similarly, keep the letter short. The more you write, the more you can accidentally commit to. Save detailed policies — performance review cycles, expense reimbursement procedures, disciplinary processes — for an employee handbook, not the offer letter.
Non-compete clauses deserve a separate note. Their enforceability varies widely by state. California prohibits the vast majority of non-compete agreements, for example. If you intend to include a non-compete or non-solicitation clause, have an employment attorney review it for the specific state where the employee will work before you send the offer.
Handle taxes and payroll setup correctly
An offer letter is not a payroll document, but what you promise in it has direct payroll consequences. When the employee accepts, you will need a completed Form W-4 to determine federal income tax withholding. Federal income tax is progressive, running from 10% to 37% depending on income and filing status.
You will also withhold FICA taxes: Social Security at 6.2% up to the annual wage base and Medicare at 1.45% with no cap. A 0.9% Additional Medicare surcharge applies to higher earners. As the employer, you match the Social Security and Medicare portions. The salary you put in the offer letter is the gross figure the employee will see on their W-2 — make sure candidates understand what that means for their take-home pay if they ask.
If you are hiring across multiple states, note that some states have no state income tax (Texas and Florida, for example) while others have their own withholding requirements on top of federal obligations. How Mellow runs payroll across six countries covers some of the cross-border mechanics if you are also managing international hires.
Get the right sign-off — from the candidate, not just you
Once the letter is drafted and reviewed, send it with a clear expiration date for acceptance. A deadline of five to seven business days is common. Ask the candidate to sign and return the letter — either wet signature or a valid electronic signature — before the start date is confirmed.
Keep the signed copy in the employee's personnel file. If a dispute arises later about what was agreed, that document is your first line of evidence.
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