Paying seasonal and temporary staff in the United States
Reviewed by Mellow Editorial Team, HR & payroll content team
Seasonal and temporary workers are employees under US law the moment you direct and control their work — which means the same federal and state payroll obligations apply to them as to your permanent staff, regardless of how short the engagement is.
Classify the worker correctly before anything else
The most consequential decision is whether the person is an employee or an independent contractor. The IRS uses a behavioral, financial, and relationship-control test. If you set the hours, provide the tools, and direct how the work gets done, the worker is almost certainly an employee — even if the job lasts only a week or two.
Misclassifying an employee as a 1099 contractor exposes you to back taxes, penalties, and interest. If a seasonal worker genuinely qualifies as a contractor, you collect a Form W-9 and issue a Form 1099-NEC if you pay them $600 or more during the tax year. Everything below assumes the worker is an employee.
Onboarding paperwork
Before the first paycheck, you need three documents:
Form I-9. Verify the worker's identity and employment eligibility. You must complete Section 2 within three business days of the start date. Keep I-9s for at least three years from the hire date or one year after termination, whichever is later.
Form W-4. The employee uses this to tell you how much federal income tax to withhold. Federal income tax is progressive, running from 10% to 37% across brackets. Without a W-4 on file, IRS rules require you to withhold at the single filing status with no adjustments — do not skip collecting it.
State equivalent forms. Many states have their own withholding certificate. Check the requirements for every state where the employee performs work, not just where your business is registered.
Running payroll and withholding taxes
Seasonal and temporary employees are subject to exactly the same FICA obligations as permanent staff:
- Social Security: 6.2% withheld from the employee's wages, up to the annual wage base, plus a matching 6.2% from you as the employer.
- Medicare: 1.45% withheld from the employee, no wage cap, plus a matching 1.45% from you.
- Additional Medicare Tax: 0.9% withheld on wages above the applicable threshold for high earners — you do not match this portion.
Federal income tax is withheld according to the employee's W-4 and the IRS withholding tables (Publication 15-T). State income tax follows state rules; workers in Texas, Florida, Washington, and a handful of other states owe no state income tax, but most states do impose it.
Deposit federal taxes (withheld income tax plus both sides of FICA) on a schedule the IRS assigns based on your lookback period — either semi-weekly or monthly. Missing deposit deadlines triggers a percentage-based penalty that grows the longer the balance stays unpaid.
Reporting obligations
Form 941 is filed quarterly and reconciles wages paid with federal taxes withheld and deposited. Even if a seasonal worker was only employed in Q2, you file a 941 for that quarter.
Form W-2 must reach the employee and the Social Security Administration by January 31 following the tax year — regardless of whether the person still works for you. If a summer worker was employed only in June and July of 2026, they still receive a W-2 by January 31, 2027.
If the worker was a contractor, the Form 1099-NEC deadline is the same: January 31.
State and local rules that often catch employers off guard
A short engagement does not simplify state compliance — in some ways it complicates it.
Unemployment insurance (UI). You pay state unemployment tax (SUTA) on seasonal and temporary employees. Rates and wage bases vary by state and by your experience rating. High seasonal turnover can increase your SUTA rate over time.
Workers' compensation. Most states require coverage from day one of employment, with no minimum duration exemption. Verify your policy covers short-term hires; some policies require you to report new employees within a set window.
Paid leave mandates. There is no federal statutory paid sick leave or vacation entitlement, but over a dozen states and several cities have paid sick leave laws. Some apply from the first day of work; others have accrual thresholds. California, for instance, has broad paid sick leave requirements that can apply even to workers hired for a single season.
Non-compete agreements. If you ask seasonal staff to sign any restrictive covenant, note that California prohibits most non-compete clauses and other states are increasingly restricting them.
Multi-state work. If a temporary worker crosses state lines — common in construction, events, or logistics — you may owe payroll tax in multiple states simultaneously. For employers managing workers across several jurisdictions, how Mellow runs payroll across six countries on one platform illustrates how layered compliance can be handled systematically.
The short version: a two-week hire carries essentially the same compliance footprint as a two-year hire. Build your onboarding checklist once, apply it every time, and the administrative burden stays manageable.
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