Every year-end close asks a lot of a staffing back office. This one asks more. For the first time, 2026 Forms W-2 have to show qualified overtime as its own number, and for an agency running hourly workers across multiple assignments, that one change touches timekeeping, pay codes and payroll setup all at once.
Here is what changes for the 2026 year-end, the deadlines that don't move, and a checklist to work through before January.
The big change: qualified overtime goes on the W-2
The 2025 federal tax law created a deduction that lets workers deduct part of the overtime they earn on their personal returns. To support it, employers must now report qualified overtime compensation separately on Form W-2, in Box 12 using Code TT. The IRS updated its guidance in August 2026 (Fact Sheet FS-2026-13).
A few details matter enormously for staffing:
- Only the premium counts. Qualified overtime is the portion of overtime pay above the regular rate - generally the "half" in time-and-a-half - not the full overtime wage.
- Only FLSA overtime counts. The amount is tied to overtime required by the federal Fair Labor Standards Act. Overtime paid only because of a state rule, such as California's daily overtime, or because a client contract or company policy is more generous, is generally not qualified overtime. Your pay codes need to tell those apart.
- Report the full amount. Employers report all qualified overtime paid, even if a worker can only deduct part of it. The deduction caps (up to $12,500, or $25,000 on a joint return) are the worker's concern on their own return, not a payroll limit.
- Withholding doesn't change on its own. Qualified overtime is still subject to federal income tax withholding. A worker who wants less withheld has to submit a new Form W-4.
- Mistakes need a W-2c. An error in Code TT has to be corrected with Form W-2c, and information-reporting penalties can apply.
Why staffing gets hit hardest
Most employers will add a payroll report and move on. Staffing agencies face a harder version of the same problem:
- The regular rate is rarely simple. Shift differentials, attendance and production bonuses, and other non-discretionary pay have to be built into the regular rate. If they aren't, both the overtime paid and the Code TT amount are wrong.
- Hours add up across assignments. When one worker logs time at two client sites in the same workweek, the employer has to combine those hours to calculate overtime. Split timesheets are where overtime quietly goes missing.
- Multi-state workforces mix the rules. A worker in a state with daily overtime can earn overtime that is legally owed but not "qualified" for the W-2 figure. You need both numbers.
- Volume magnifies every error. A setup mistake repeated across hundreds of W-2s becomes hundreds of corrections.
The deadlines that don't move
- February 1, 2027: Forms W-2 to employees and the Social Security Administration, and Forms 1099-NEC to contractors and the IRS. January 31 falls on a Sunday, which pushes the deadline to Monday.
- February 1, 2027: Form 941 for the fourth quarter and the annual Form 940.
- January 1, 2027: The Social Security wage base rises to $192,300, up from $184,500 for 2026. Make sure your payroll system has the new limit before the first 2027 pay run.
Watch California's FUTA credit reduction
States that carry unpaid federal unemployment loans see their employers' FUTA credit reduced. For 2026, California and the U.S. Virgin Islands are the two jurisdictions at risk, with final status confirmed after the November 10 cutoff. Depending on whether California receives a waiver, the extra cost can range from roughly $105 to $371 per California employee, due with the fourth-quarter FUTA deposit and reported on Schedule A of Form 940. If you have California workers, budget for it now rather than finding it in January.
Your 2026 year-end checklist
- Separate your pay codes. Confirm FLSA overtime, state-only overtime and contractual premium pay are tracked as different earnings types.
- Audit the regular rate. Check that every bonus and differential that belongs in the regular rate is included in overtime calculations.
- Reconcile multi-assignment workers. Pull everyone who worked more than one assignment in a workweek and confirm their hours were combined.
- Run a Code TT preview. Compare year-to-date qualified overtime against total overtime by worker, and investigate anything that looks off.
- Verify addresses and SSNs. High-turnover workforces mean many former employees. Clean records now prevent returned W-2s and mismatches.
- Confirm contractor records. Collect any missing Form W-9 information before 1099-NEC season.
- Load 2027 tax tables and limits, including the new Social Security wage base and state unemployment rates as they're published.
- Plan for corrections. Decide in advance who handles W-2c requests, because workers will ask about Box 12 as soon as they file.
The structural fix
Every item on that list lands on whoever is the W-2 employer. For agencies that work with an Employer of Record, much of this burden sits with the EOR - the overtime tracking, the Code TT reporting, the W-2 production and the corrections that follow.
That is exactly the work VimHR handles. Payroll runs through our own technology platform, where hours are captured by worker and by assignment, overtime is calculated across every site a worker touches, and year-end forms come out of the same system that ran payroll all year. Your agency keeps its clients and its brand. We take the year-end headaches.
This article is for general information and isn't tax or legal advice. Rules continue to evolve, so confirm details for your situation with a qualified tax professional.
Want to see how your year-end would look on VimHR? Contact our team.