The Short Version
Box 12 code TT reports the total qualified overtime compensation your employer paid you during the year — the premium half only, not your full overtime earnings. It applies to tax year 2026 and later, so the first W-2 carrying a code TT figure is the one issued in early 2027. You copy that number onto Schedule 1-A to claim the deduction.
Why Code TT Did Not Exist for 2025
The OBBBA created the overtime deduction retroactively to January 1, 2025 — months after payroll systems had already been configured for the year. The IRS responded with transition relief: for tax year 2025, employers were not required to separately report qualified overtime on Forms W-2, 1099-NEC, or 1099-MISC.
That is why 2025 W-2s were inconsistent. Some employers disclosed the premium voluntarily in Box 14 (the free-text box), some issued a separate statement, and many showed nothing at all. Workers in that last group had to compute the figure themselves using the methods in IRS Notice 2025-69 and the Schedule 1-A instructions — most commonly by dividing total overtime pay by three.
From tax year 2026 forward that guesswork ends. Separate reporting is mandatory, and on the W-2 it lives in Box 12 under code TT.
What the Number Actually Represents
This trips up almost everyone who sees it for the first time: the code TT amount is much smaller than your overtime earnings, and that is correct.
Qualified overtime compensation is defined as the portion of FLSA-required overtime pay that exceeds your regular rate. If you are paid time-and-a-half, your overtime dollar splits into two parts:
- The straight-time component — your regular rate for those hours. Ordinary wages. Not deductible.
- The premium component — the extra half. This is qualified overtime compensation, and this is what appears in code TT.
An employee earning $24/hour who works 200 overtime hours receives $7,200 of overtime pay ($24 × 1.5 × 200). Of that, $4,800 is straight time and $2,400 is the premium. Box 12 code TT shows $2,400 — exactly one third of the overtime pay, which is why the divide-by-three shortcut works for standard time-and-a-half.
Note also that the code TT amount is already inside your Box 1 wages. It is not additional income. Box 12 is telling the IRS which slice of Box 1 qualifies for a deduction, not reporting money you have not already been taxed on.
The Codes That Arrived Alongside It
Code TT is one of several new Box 12 codes introduced by the OBBBA reporting changes. You may also see:
- TP — qualified tips, for the companion no-tax-on-tips deduction.
- TA — contributions to a Trump Account.
If you earn both tips and overtime, both deductions stack on the same Schedule 1-A, each with its own cap and phase-out. You can size the tips side with the no-tax-on-tips calculator.
If Code TT Is Missing or Looks Wrong
A few common situations, and what each one means:
- No code TT on a 2026 W-2, but you worked overtime. Ask payroll. Either the overtime was not FLSA-required (see which overtime actually qualifies), or the reporting was misconfigured. Employers are required to report it for 2026.
- The amount looks like your full overtime pay. That is a red flag — the box should hold the premium only. If your employer reported the gross overtime figure, claiming it as-is would overstate your deduction by roughly 3×.
- You are a salaried exempt employee with a code TT amount. Also worth questioning. Exempt employees are not owed FLSA overtime, so there is generally no qualified overtime to report.
- You are an independent contractor. Qualified overtime can appear on Forms 1099-NEC and 1099-MISC as well, but only where FLSA overtime was genuinely required — which for a true contractor relationship is unusual.
Whatever the box says, run the figure through the no tax on overtime calculator before you file. It applies the $12,500 / $25,000 cap and the MAGI phase-out, which the W-2 does not do for you.