The employee lifecycle in the United States, end to end
Reviewed by Mellow Editorial Team, HR & payroll content team
The employee lifecycle in the US runs from the moment you decide to hire through to offboarding — and at each stage there are legal obligations, tax steps, and HR decisions that affect both compliance and employee experience. Getting the sequence right from the start saves significant rework later.
Recruiting and making an offer
Before you post a role, decide whether you're hiring an employee or a contractor. Misclassification — treating a worker as a 1099 contractor when they function as an employee — carries back taxes, penalties, and interest from the IRS and potentially state agencies.
Once you've selected a candidate, put the offer in writing. Include the job title, compensation, start date, and whether the role is full-time or part-time. Employment in the US is generally at-will, meaning either party can end the relationship at any time for any lawful reason. Your offer letter should reflect that unless you intend to create a contract with specific termination terms.
Onboarding and legal paperwork
Onboarding is where compliance starts in earnest. Every new employee must complete:
- Form I-9 — verifies identity and work authorization. You must complete Section 2 within three business days of the start date and retain the form for a defined period after employment ends.
- Form W-4 — tells you how much federal income tax to withhold. Federal income tax is progressive, running from 10% to 37% depending on income and filing status. The W-4 is the employee's instruction to you; keep it on file and update withholding if they submit a new one.
- State tax withholding form — most states with an income tax have their own equivalent. Some states — Texas, Florida, and Washington among them — have no state income tax, which simplifies this step.
- Benefits enrollment forms — health insurance, retirement plan elections, and any voluntary deductions need to be captured at or shortly after hire, within your plan's enrollment window.
Many states require you to report new hires to a state agency within a set number of days of the start date. This feeds into the federal child support enforcement system.
Running payroll correctly
Once someone is on your payroll, you're responsible for calculating and remitting taxes accurately on every pay cycle.
FICA contributions are split: employees pay 6.2% for Social Security (up to the annual wage base) and 1.45% for Medicare with no cap. You match both as the employer. High earners trigger an additional 0.9% Medicare surcharge on their portion above the income threshold — you withhold it but do not match it.
You deposit withheld taxes and your employer share either semi-weekly or monthly depending on your deposit schedule, and you file Form 941 every quarter to reconcile those deposits. By January 31 of the following year, you must furnish each employee with a Form W-2 and submit copies to the Social Security Administration.
Payroll errors compound quickly. A missed deposit or incorrect withholding in Q1 can create a cascading reconciliation problem by year-end. Getting payroll right on the first paycheck is far easier than correcting it six months later.
During employment: ongoing obligations
The active employment period carries its own compliance layer. Key areas to stay current on:
Leave. There is no federal statutory paid annual leave or paid sick leave. However, several states and municipalities mandate paid sick leave accrual. The federal Family and Medical Leave Act (FMLA) provides eligible employees at covered employers up to 12 weeks of unpaid, job-protected leave — it applies once you have 50 or more employees within 75 miles.
Pay practices. You must meet federal and state minimum wage requirements — whichever is higher applies. Overtime rules under the Fair Labor Standards Act (FLSA) require non-exempt employees to receive at least 1.5 times their regular rate for hours over 40 in a workweek.
Non-competes and restrictive covenants. Enforceability varies sharply by state. California prohibits most non-compete clauses outright. Other states enforce them with varying degrees of scrutiny. Draft any restrictive covenant with state law in mind.
Performance documentation. Because most employment is at-will, you don't legally need documented cause to terminate — but documentation protects you against discrimination or retaliation claims. Keep performance reviews, disciplinary records, and any written warnings.
Offboarding and termination
When employment ends — whether through resignation, layoff, or termination — several obligations kick in immediately.
Final pay timing is governed by state law. Some states require the final paycheck on the last day of employment; others allow the next regular pay date. Missing the deadline can trigger penalties.
COBRA continuation coverage — if you have 20 or more employees and offer group health insurance, departing employees have the right to continue coverage at their own expense. You must send the required election notice within a specific timeframe.
Form W-2 must still be issued for the final year of employment by January 31 of the following year, just as it would for a current employee.
Document retention matters at separation. I-9 forms, payroll records, and personnel files each have minimum retention periods under federal and state law. Build a consistent offboarding checklist that covers system access revocation, equipment return, and records filing so nothing falls through.
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