Making a great first day in the United States
Reviewed by Mellow Editorial Team, HR & payroll content team
A great first day for a new US employee comes down to two things: completing the required legal paperwork on time and making the person feel oriented and welcome. Neither is complicated, but skipping steps creates compliance risk or a poor impression that's hard to recover from.
Before Day One: Get the Paperwork Ready
Most of the compliance work happens before your new hire walks in.
Form I-9. You must verify employment eligibility. The employee completes Section 1 on or before their first day. You complete Section 2 — physically examining identity and work-authorization documents — within three business days of the start date. Keep the I-9 on file; you do not submit it to the government unless audited.
Form W-4. This tells you how to withhold federal income tax. Federal income tax is progressive, with brackets running from 10% to 37%, and withholding is based on what the employee enters on the W-4. Without it you are required to withhold at the default rate, which may not match the employee's situation. Hand it out before or on day one so payroll can be set up correctly from the first check.
State tax forms. If your state has an income tax, there is usually a state equivalent of the W-4. Texas, Florida, and Washington are among the states with no state income tax, so this step does not apply there — but check your own state's requirements.
Benefits enrollment. If you offer health insurance, a 401(k), or other benefits, enrollment windows are often short. Give employees the enrollment materials on day one so deadlines do not catch anyone off guard.
Direct deposit authorization. Get the employee's banking details early so their first paycheck arrives on time. A delayed first payment is a fast way to damage trust.
Day One: Walk Through the Essentials in Person
Keep the first-day agenda focused. New employees absorb a limited amount of information when everything is unfamiliar.
Cover the basics:
- Where things are physically (bathrooms, exits, kitchen, equipment)
- How to log into systems and get email access
- Who to contact for IT problems, HR questions, and day-to-day management
- What the rest of the first week looks like — a rough schedule removes anxiety
Introduce the person to immediate colleagues. A brief round of introductions matters more than a formal company-wide announcement.
Assign a buddy or point of contact for the first few weeks — someone the new hire can ask questions without worrying about looking uninformed. This costs almost nothing and significantly reduces early attrition.
Pay and Payroll Transparency
Be explicit about how and when the employee will be paid. Employees should leave day one knowing:
- Their pay frequency (weekly, bi-weekly, semi-monthly)
- When their first paycheck will arrive
- How to read their pay stub, including what FICA deductions are
On the FICA point: the employee will see Social Security withheld at 6.2% of wages up to the annual wage base, Medicare withheld at 1.45% with no cap, and potentially an Additional Medicare surcharge of 0.9% if they are a high earner. Employers match the Social Security and Medicare portions. Explaining this briefly on day one prevents confused calls to HR later.
Also clarify: they will receive a Form W-2 by January 31 of the following year, which reports wages and withholding for the tax year. This is distinct from a 1099-NEC, which applies to independent contractors — a distinction worth making explicit if there was any ambiguity during the hiring process.
Setting Expectations on Employment Terms
The US operates under at-will employment in most states by default, meaning either party can end the employment relationship at any time for any lawful reason. Most employees know this in principle, but it is worth confirming whether you have an offer letter or employment agreement that modifies anything, and walking through any specific policies — probationary periods, performance review timelines, notice expectations — so there are no surprises.
If you have a non-compete clause in your offer letter, note that California prohibits most non-compete agreements. Other states vary. If you hire across multiple states, how Mellow runs payroll across six countries is a useful reference for managing compliance across jurisdictions.
Also confirm that there is no federal statutory paid leave — no mandated paid vacation or paid sick leave at the federal level. If you offer either, explain your specific policy clearly so the employee knows what they have earned and when they can use it.
End of Day One: A Simple Check-In
Before the employee leaves, spend five minutes asking if they have everything they need, whether paperwork makes sense, and whether any questions came up that were not addressed. This is not a formality — it catches missing documents, confusing instructions, or a form that was never handed over.
The employee should leave on day one knowing their role is real, their paperwork is in order, and they have a clear path through the first week.
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