Box 12 Code TT: How to Report Qualified Overtime on Your 2026 W-2s

A W-2 with nothing in box 12, code TT is one of payroll's newest traps.

Under the One, Big, Beautiful Bill Act, an employee can deduct up to $12,500 of qualified overtime compensation, or $25,000 on a joint return. Starting with tax year 2026, you have to report that overtime separately on Form W-2, in box 12, using code TT. The fact sheet the IRS put out in August says what that entry does. For tax years after 2025, employees "may not consider any amount of qualified overtime compensation in excess of what is reported on Form(s) W-2, box 12, code TT."

Not a dollar more than the number you reported. No matter what you actually paid.

That line is new. It arrived on August 6, 2026, when the IRS released IR-2026-88 and with it Fact Sheet 2026-13, a 32-question replacement for the January 23, 2026 guidance. The new fact sheet deletes everything that applied only to 2025. What it adds is the machinery. Reporting rules for Form W-2 and the 1099s. Federal income tax withholding procedures. And the requirement that you report qualified overtime separately on a W-2 before anyone can deduct it.

If you run a payroll in Florida with non-exempt hourly staff, this is yours to get right. Five people on the clock, or a hundred and fifty. It belongs to the office manager, too, or the bookkeeper who builds the January W-2 file.

Starting with tax year 2026, the number you put in box 12, code TT is the ceiling on what your employee can deduct.

Why box 12 does not carry the whole overtime check

Box 12, code TT carries only the premium half of time and a half. Only the half the Fair Labor Standards Act actually required you to pay. The overtime check your employee cashed is a bigger number. Qualified overtime compensation is the premium portion, per workweek, and nothing else.

The IRS works the example with one employee. Individual A is overtime eligible under the FLSA and works 50 hours in a workweek at $20 an hour, with no other pay. That makes the regular rate $20. The employer pays overtime at two times the regular rate, so the 10 overtime hours come to $400: $200 of straight time and a $200 premium. But the FLSA only required $300 on those hours, $200 of straight time and a $100 premium. Qualified overtime compensation for that week is $100.

Only the half counts. The generosity above it is still pay, and it is still taxable, and it goes nowhere near box 12.

The formula is the same every time. FLSA hours over 40 in the workweek, times one half, times the regular rate.

The regular rate is not the hourly wage, and it resets every workweek

The FLSA regular rate is total pay for the workweek, minus the statutory exclusions, divided by the FLSA hours actually worked. It is not the base hourly wage. It takes in pay on a piece rate, a salary, a commission, or some other basis.

The workweek is its own island. It is a fixed and regularly recurring period of 168 hours, seven consecutive 24-hour periods. You pick when it starts. Each workweek stands alone. There is "no averaging of hours over 2 or more workweeks."

And only FLSA-required overtime qualifies. The IRS names the premiums that do not count. Hours past 8 in a workday. Hours past 35 in a workweek. Weekend or holiday hours. A premium set as a percentage of base rate. Premiums you owe under state law or under a collective bargaining agreement.

Real money, paid to real people, none of it qualified overtime compensation.

Report the full amount, not the capped amount

Box 12, code TT gets the whole amount of qualified overtime you paid, even when that number sits far above what anyone can deduct. The IRS works the case. An employer pays an employee $30,000 of qualified overtime compensation in 2026. All $30,000 goes in box 12, code TT, "even though the overall limit on the deduction is $12,500 ($25,000 in the case of a joint return)."

Yours is the amount paid. The cap lands on the return, and someone who is not you applies it on Schedule 1-A.

Reporting $12,500 because $12,500 is the limit understates the box, and an understated box is a number your employee cannot argue with.

Withholding does not change on its own

You cannot lower an employee's federal income tax withholding because of this deduction. Overtime pay, qualified or not, stays subject to income tax withholding. That holds "unless the employee furnishes the employer an updated and valid Form W-4 accounting for the employee's expected deduction." The move belongs to them. On paper, in your file.

The 2026 Form W-4 already has a place for it. Step 4(b) is where an employee accounts for the deduction, using the step 4(b) deduction worksheet. The IRS updated its Tax Withholding Estimator to match. Nothing happens in payroll until that form arrives.

So when someone asks in November why the check has not changed, that is the answer. The deduction lands on the Form 1040 they file, not on what you owe.

Owner-operators and the 20 percent rule

Two conditions make an owner a bona fide executive under the FLSA. They hold at least a bona fide 20-percent equity interest in the business, and they are actively engaged in its management. That employee is exempt from the overtime requirement, and outside qualified overtime compensation entirely.

The IRS added that line in August, and the entity type does not matter. Below 20 percent, the answer is not automatic. The executive, administrative, and professional exemptions still apply on their own terms. Whatever a collective bargaining agreement says about overtime, an employee the FLSA does not cover gets nothing here.

What to hand your staff

Your employee claims this on Schedule 1-A (Form 1040), Part III. The last line of Part III is the deductible amount. The cap shrinks by $100 per $1,000 of modified adjusted gross income above $150,000, or $300,000 joint. Never below zero. They also need a Social Security number valid for employment. SSA has to issue it before the due date of the return, including extensions. Tips are a separate deduction with its own rules.

What happens when the number is wrong

Everything above is about building the number. This is what happens when you build it wrong.

For tax years after 2025, an employee may not use any qualified overtime compensation above what appears in box 12, code TT. There is no relief left. Tax year 2025 had it, under Notice 2025-69. Tax year 2026 does not.

The IRS example is short. An employer paid Individual B $10,000 of qualified overtime compensation. The employer reported $5,000 and would not correct it. Individual B may use only $5,000.

Overstating fails the same way. Report $10,000 against $5,000 actually paid, and the employee still gets $5,000.

Form 4852, the substitute W-2, does not rescue it. Section 6051(a)(19) does not cover it. The only repair is a Form W-2c you agree to file and furnish. An incorrect W-2 also puts you in reach of information reporting penalties under sections 6721 and 6722. Timely corrections reduce them.

The deduction is your employee's. The number has always been yours.

What this comes down to before January

Go back to the trap. To anyone who sees it, a W-2 with nothing in box 12, code TT does not read as an error. It reads as an employee who worked no qualified overtime. The return goes out that way, and the deduction never happens.

Up to $12,500, or $25,000 on a joint return. That is what the law allows. Box 12, code TT is what decides it, and after 2025 nothing else raises the number. Not a substitute form. Not a pay stub.

Your payroll system is already computing something for every overtime hour you pay. It has been computing it correctly for years, by its own standard. Before the 2026 W-2s go out, the only question worth asking is whether that standard is the FLSA's.

Questions about box 12, code TT