Qualified Overtime Compensation: How to Actually Calculate It
Qualified overtime compensation — the number employers must report in W-2 Box 12 under code TT starting tax year 2026 — is defined in IRC §225(c) as overtime compensation required under section 7 of the FLSA that is in excess of the regular rate (Notice 2025-69 §II.B). The 2026 W-2 instructions call it "the 'and-a-half' portion of time-and-a-half compensation."
The definition fits in a sentence. The calculation is where employers get it wrong — because the premium rides on the regular rate, not the hourly wage, and the regular rate moves whenever bonuses, commissions, or differentials exist. This page works the computation through five examples, every number shown, including the exact cases where the popular ÷3 shortcut diverges from the true figure. Each one can be reproduced in the free TT calculator — these are its published test cases.
The three-step method (per workweek)
The computation runs per workweek — the FLSA's unit of account — and the year's Box TT figure is the sum of 52 of these:
- Sum the includable remuneration. Hourly pay plus everything 29 USC §207(e) puts in the regular rate: nondiscretionary bonuses (attendance, production, safety — anything promised or expected), commissions, shift differentials, on-call pay (DOL Fact Sheet #56A; #56C for bonuses). The eight statutory exclusions are narrow; the default is in.
- Divide by total hours worked that week to get the regular rate (29 CFR 778.110).
- Multiply 0.5 × regular rate × FLSA overtime hours (hours over 40). That product is the week's qualified overtime compensation — the 0.5× premium only, on FLSA-required overtime only (Notice 2025-69 §II.B).
regular rate = includable remuneration ÷ total hours worked qualified OT = 0.5 × regular rate × hours over 40
Two things the formula deliberately leaves out: the 1.0× straight-time portion of overtime hours (ordinary wages, not qualified), and any overtime the FLSA doesn't require — state-law-only overtime, contractual overtime, and anything paid to FLSA-exempt workers (Notice 2025-69; full exclusion analysis in the code TT employer guide). Now the examples.
Example 1: hourly pay only — the case where ÷3 is exact
Start with the clean case, straight from the regulation's first illustration (29 CFR 778.110(a)): $12/hour, 46 hours, nothing else.
| Step | Arithmetic | Result |
|---|---|---|
| Includable remuneration | 46 h × $12.00 | $552.00 |
| Regular rate | $552.00 ÷ 46 h | $12.00/h |
| FLSA overtime hours | 46 − 40 | 6 h |
| Qualified OT (code TT, this week) | 0.5 × $12.00 × 6 | $36.00 |
| Total weekly pay | $552.00 + $36.00 | $588.00 |
Check the shortcut: the paystub's overtime line is 1.5 × $12 × 6 = $108.00, and $108 ÷ 3 = $36.00 — exactly right. When base hourly pay is the only remuneration and every OT hour is paid at 1.5× a correct regular rate, ÷3 and the true figure coincide. This is the case the shortcut was built on. Every example after this one breaks it.
Example 2: the regulation's own bonus case — ÷3 goes wrong by $3
Same employee, same 46 hours — now add a $46 nondiscretionary production bonus. This is the exact fact pattern in 29 CFR 778.110(b), so you can check every line against the regulation.
| Step | Arithmetic | Result |
|---|---|---|
| Includable remuneration | 46 h × $12.00 + $46.00 | $598.00 |
| Regular rate | $598.00 ÷ 46 h | $13.00/h |
| FLSA overtime hours | 46 − 40 | 6 h |
| Qualified OT (code TT, this week) | 0.5 × $13.00 × 6 | $39.00 |
| ÷3-style estimate (base-rate premium) | 0.5 × $12.00 × 6 | $36.00 |
| Divergence | $39.00 − $36.00 | $3.00 understated |
| Total weekly pay | $598.00 + $39.00 | $637.00 |
The bonus raised the regular rate from $12 to $13, and the premium follows the rate. A system that pays overtime on the base rate — and a ÷3 of the OT line it produces — reports $36 for a week whose true qualified overtime is $39. Notice 2025-69 method (E) describes exactly this failure: the ÷3 approach "would result in underestimating the employee's qualified overtime compensation (for example, because the individual's regular rate is increased by a nondiscretionary bonus)." Note the $3 is double exposure: Box TT understated and $3 of overtime unpaid.
Example 3: a weekly bonus at working scale
Maria earns $20/hour, works 50 hours, and receives a $200 weekly attendance bonus — nondiscretionary, because it's promised (DOL Fact Sheet #56C).
| Step | Arithmetic | Result |
|---|---|---|
| Includable remuneration | 50 h × $20.00 + $200.00 | $1,200.00 |
| Regular rate | $1,200.00 ÷ 50 h | $24.00/h |
| FLSA overtime hours | 50 − 40 | 10 h |
| Qualified OT (code TT, this week) | 0.5 × $24.00 × 10 | $120.00 |
| ÷3-style estimate (base-rate premium) | 0.5 × $20.00 × 10 | $100.00 |
| Divergence | $120.00 − $100.00 | $20.00 understated |
| Total weekly pay | $1,200.00 + $120.00 | $1,320.00 |
Same structure as Example 2, working-payroll magnitude: $20 per week, per employee. At these inputs held constant, that is $20 × 52 = $1,040 per employee per year of understated Box TT — which is simultaneously $1,040 of unpaid overtime premium. This is the default scenario in the TT calculator; change any input and watch both figures move.
Example 4: shift differentials count too
Bonuses are not the only rate-raiser. Shift differentials are includable remuneration under §207(e) (DOL Fact Sheet #56A). Take $18/hour, 44 hours, with $88 of night-shift differentials for the week:
| Step | Arithmetic | Result |
|---|---|---|
| Includable remuneration | 44 h × $18.00 + $88.00 | $880.00 |
| Regular rate | $880.00 ÷ 44 h | $20.00/h |
| FLSA overtime hours | 44 − 40 | 4 h |
| Qualified OT (code TT, this week) | 0.5 × $20.00 × 4 | $40.00 |
| ÷3-style estimate (base-rate premium) | 0.5 × $18.00 × 4 | $36.00 |
| Divergence | $40.00 − $36.00 | $4.00 understated |
| Total weekly pay | $880.00 + $40.00 | $920.00 |
Any workforce with second-shift or weekend differentials has this divergence every week the differential and overtime coincide — which, for shift-based operations, is most weeks.
Example 5: California daily overtime in a sub-40 week — qualified OT is $0
The other direction matters too: not everything your payroll calls overtime is qualified. A California employee at $20/hour works 38 hours, including one 10-hour day.
| Step | Arithmetic | Result |
|---|---|---|
| Includable remuneration | 38 h × $20.00 | $760.00 |
| Regular rate | $760.00 ÷ 38 h | $20.00/h |
| FLSA overtime hours | max(0, 38 − 40) | 0 h |
| Qualified OT (code TT, this week) | 0.5 × $20.00 × 0 | $0.00 |
| California daily-OT premium (still owed as wages) | 0.5 × $20.00 × 2 h over 8/day | $20.00 |
California requires time-and-a-half for the 2 hours beyond 8 in that day — but the FLSA does not, because the week never crossed 40. Qualified overtime compensation covers only overtime "required under section 7 of the FLSA," so the week contributes $0.00 to Box TT even though $20.00 of overtime premium is genuinely owed under state law (Notice 2025-69 §II.B). A system that dumps its whole OT accumulator into code TT overstates the box for every California employee with daily-OT weeks; the state-law layers are covered in the code TT employer guide.
Where ÷3 diverges: the summary table
Putting the four federal examples side by side — true qualified OT versus the ÷3-style, base-rate figure:
| Example | Rate-raiser | True qualified OT | ÷3-style estimate | Weekly gap |
|---|---|---|---|---|
| 1 — $12, 46 h, nothing else | None | $36.00 | $36.00 | $0.00 |
| 2 — $12, 46 h, $46 bonus | Production bonus | $39.00 | $36.00 | $3.00 |
| 3 — $20, 50 h, $200 bonus | Attendance bonus | $120.00 | $100.00 | $20.00 |
| 4 — $18, 44 h, $88 differential | Shift differential | $40.00 | $36.00 | $4.00 |
The pattern is the point: ÷3 is exact precisely when nothing raises the regular rate, and understates in every other row — the direction and cause the IRS itself documented in Notice 2025-69 method (E). And remember the shortcut's legal status: it was employee-side guidance, for tax year 2025 only ("This notice applies to the 2025 tax year"); no estimation method has been blessed for TY2026 employer W-2 reporting.
Quarterly bonuses: the allocation step most systems skip
When a nondiscretionary bonus covers multiple workweeks — quarterly, annual — 29 CFR 778.209 requires allocating it back across the weeks it was earned, recomputing each week's regular rate, and paying the additional half-time on each week's overtime hours. That true-up is FLSA-required premium, so it belongs in the TT total.
A $1,300 quarterly bonus over 13 weeks, for an employee working uniform 45-hour weeks (5 OT hours each):
| Step | Arithmetic | Result |
|---|---|---|
| Per-week allocation | $1,300 ÷ 13 weeks | $100.00/week |
| Regular-rate increase | $100.00 ÷ 45 h | ≈ $2.2222/h |
| Additional premium per week | 0.5 × $2.2222 × 5 | ≈ $5.5556 ($5.56 rounded) |
| True-up for the quarter (added to code TT) | 13 × $5.5556 | ≈ $72.22 |
(Uniform 45-hour weeks are an illustration assumption — real weeks vary, which is exactly why the allocation has to run on actual data. Per-week figures are shown rounded; the quarter total is computed before rounding: 13 × $5.555… = $72.22, not 13 × $5.56 = $72.28.) Batch payroll systems close periods forward and rarely reopen them when an October bonus lands; if the true-up is never paid, it never enters the OT totals — and never enters Box TT. One design escapes the replay: a bonus set as a fixed percentage of total earnings including overtime already embeds the premium (DOL Opinion Letter FLSA2026-6 (2026)). Flat-dollar bonuses get no such pass.
Run any of these examples — or your own week — in the TT calculator. It computes the regular rate, the true qualified OT, and the bonus-blind figure side by side, and shows the gap in dollars. These five examples are its published test cases.
FAQ
What is qualified overtime compensation? The amount defined in IRC §225(c) and reported on the W-2 in Box 12 under code TT starting tax year 2026: overtime compensation required under section 7 of the FLSA that is in excess of the regular rate — the 0.5× premium portion of time-and-a-half, per Notice 2025-69 §II.B and the 2026 W-2/W-3 instructions. It excludes the straight-time portion of overtime pay, state-law-only overtime, and contractual overtime the FLSA doesn't require.
What is the formula for qualified overtime compensation? Per workweek: (1) sum all includable remuneration — hourly pay plus nondiscretionary bonuses, commissions, and shift differentials (29 USC §207(e); DOL Fact Sheet #56A); (2) divide by total hours worked to get the regular rate (29 CFR 778.110); (3) multiply 0.5 × regular rate × hours over 40. The year's Box 12 code TT amount is the sum of that weekly figure across all workweeks.
When does the total-overtime-÷-3 estimate give the wrong answer? Whenever anything besides base hourly pay belongs in the regular rate. Notice 2025-69 method (E) states the ÷3 approach "would result in underestimating the employee's qualified overtime compensation (for example, because the individual's regular rate is increased by a nondiscretionary bonus)." The ÷3 method was also employee-side guidance for tax year 2025 only — no estimation method has been blessed for tax year 2026 employer W-2 reporting.
Do shift differentials count in the regular rate for qualified overtime? Yes. Shift differentials are includable remuneration under 29 USC §207(e) (DOL Fact Sheet #56A), so they raise the regular rate and the 0.5× premium computed on it. An employee at $18/hour working 44 hours with $88 of differentials has a $20.00 regular rate and $40.00 of qualified overtime — not the $36.00 a base-rate computation produces.
How do quarterly or annual bonuses affect the calculation? Under 29 CFR 778.209, a nondiscretionary bonus earned over multiple workweeks must be allocated back across those weeks, each week's regular rate recomputed, and additional half-time premium paid on each week's overtime hours. That true-up is FLSA-required premium, so it belongs in the Box 12 code TT total. A $1,300 quarterly bonus over 13 weeks (45-hour weeks, 5 OT hours each) generates about $72.22 of additional qualified overtime.
Sources: IRS Notice 2025-69 · 2026 General Instructions for Forms W-2/W-3 · IRS Q&A: qualified overtime deduction · 29 CFR 778.110 · 29 CFR 778.209 · DOL Fact Sheet #56A · DOL Fact Sheet #56C · DOL Opinion Letter FLSA2026-6 (2026)
Not legal or tax advice. Written by an engineer who builds the computation; methodology and test cases are public. Attorney review pending — this page will carry the reviewer's byline when it does.