W-2 Box 12 Code TT Explained (2026)

What W-2 Box 12 Code TT means

Code TT is the 2026 W-2 reporting code for the total amount of qualified overtime compensation. The IRS defines the underlying amount by reference to overtime required by section 7 of the Fair Labor Standards Act (FLSA). It is the compensation above the regular rate, not a label for every dollar earned during overtime hours.

For a nonexempt employee paid time-and-a-half after 40 hours in a workweek, the regular-rate component pays for the hours worked and the extra one-half component is the overtime premium. Code TT generally tracks that premium. Contractual, state-law or employer-paid overtime that is not required by the FLSA may not qualify merely because a pay stub calls it overtime.

Code TT is new for tax year 2026. Employers must separately report qualified overtime compensation so employees can use the reported amount when completing the new federal deduction. The code is informational; it does not remove the wages from gross income or calculate the return for the employee.

Use the Overtime Pay Calculator to separate straight-time pay from the overtime premium in a simple time-and-a-half example.

Where Code TT appears on a 2026 W-2

Box 12 can contain several letter codes. Code TT appears as its own entry beside the reported dollar amount. A simplified illustration looks like this:

The $3,120 example does not say the employee earned only $3,120 during overtime hours. It says the employer reported $3,120 as qualified overtime compensation under the federal definition. Total overtime-period wages may be much higher because the regular-rate portion is included elsewhere in wages.

Keep Copy B of the W-2 and any later Form W-2c with the tax records. When multiple employers issue Code TT amounts, the return-level deduction rules apply across the relevant qualified amounts; the annual cap does not restart for each employer.

How employers calculate Code TT

The IRS gives a weekly framework for many FLSA overtime-eligible employees:

FLSA hours over 40 x one-half x FLSA regular rate = qualified overtime compensation for the workweek

Suppose an employee has a $24 FLSA regular rate and works 50 hours. The 10 overtime hours are paid at $36 per hour, so total pay attributable to those hours is $360. Of that amount, $240 is the regular-rate component and $120 is the extra one-half premium. The week's qualified overtime compensation is generally $120, not $360.

The regular rate can include more than an hourly wage. Certain bonuses and other remuneration may affect it, and FLSA coverage or exemption questions can change whether the overtime is qualified. Employees should not rebuild payroll from a simple hourly rate when the employer's regular-rate calculation includes other pay elements.

For disputed hours, rates or unpaid premiums, the Unpaid Overtime Wage Difference Worksheet can organize a separate wage comparison. It does not replace the employer's W-2 reporting duty.

Code TT is not automatically your deduction

The employer reports the full qualified overtime compensation paid in Box 12 Code TT. The employee then determines the allowed deduction under the return-level rules. Those are different jobs.

For example, the IRS explains that an employer paying $30,000 of qualified overtime compensation in 2026 reports $30,000 under Code TT even though the general deduction limit is $12,500, or $25,000 for a joint return. The W-2 does not reduce the amount to the employee's cap and cannot know all household modified adjusted gross income information needed for the phaseout.

The deductible amount also cannot exceed qualified compensation actually received. If a W-2 overstates Code TT, the reported figure does not turn unearned overtime into a deduction. Conversely, for 2026 and later, an understated W-2 can prevent the employee from using the omitted amount until the employer issues a corrected W-2c. The IRS says Form 4852 does not substitute for the employer-furnished Code TT reporting requirement for this purpose.

Think of Code TT as an employer-provided source amount, not a promise of tax savings. The tax benefit depends on the allowed deduction and the taxpayer's marginal tax situation; it is not a dollar-for-dollar credit.

2026 deduction limits and phaseout

For 2026, the maximum qualified overtime deduction is generally $12,500 for an individual return and $25,000 for a joint return. The deduction begins to phase out when modified adjusted gross income exceeds $150,000, or $300,000 for a joint return. Under the statutory phaseout formula, the deduction is reduced by $100 for each $1,000, or fraction of $1,000, above the applicable threshold.

A married taxpayer must file a joint return to claim the deduction. The employee must also meet the valid Social Security number requirement described by the IRS. The deduction is available whether the filer itemizes deductions or takes the standard deduction, but it is claimed through the applicable 2026 return workflow rather than subtracted from W-2 wages.

Three different ceilings can therefore matter:

• the qualified overtime compensation actually received;
• the amount properly reported by the employer under Code TT; and
• the annual statutory limit after any income phaseout.

The allowable deduction cannot be understood from the Code TT number alone. Filing status, household income and corrections can all change the return result.

Is the Code TT amount taxable?

Yes, the overtime compensation remains part of gross income. The new rule creates an income-tax deduction for eligible qualified overtime compensation; it does not make the pay tax-free at the moment earned and does not erase it from W-2 wages.

Employers generally continue federal income tax withholding and Social Security and Medicare taxes on overtime compensation. A refund can still increase after the deduction is claimed, but the result depends on the complete return. “No tax on overtime” is a shorthand label, not a literal payroll instruction that every overtime dollar bypasses all tax.

Code TT is therefore not the same as Box 1 wages, federal withholding, Social Security wages or Medicare wages. It supplies a separately reported amount used in determining a possible deduction. Compare each box by its own definition rather than trying to subtract TT directly from Box 1.

What to do when Code TT is wrong or missing

Start with the payroll department or employer and ask how the reported amount was derived. Compare the W-2 with pay statements, overtime hours and the regular-rate information available to you. Do not assume an amount is wrong simply because it is smaller than total overtime pay; the code generally reflects only the qualified premium component.

If the employer discovers an error, the IRS says the employer must file Form W-2c with SSA and furnish the corrected statement to the employee as soon as possible. Keep the original W-2, the W-2c, pay records and the correspondence explaining the correction.

If the amount is understated and the employer will correct it, use the corrected Code TT amount under the applicable filing instructions. If the employer is unwilling or unable to correct an understatement, the IRS's August 2026 guidance says the employee may be limited to the amount actually reported under Code TT; a Form 4852 amount does not satisfy this specific reporting requirement. That situation is a good reason to consult a qualified tax professional.

If the code is overstated, do not claim more than qualified overtime compensation actually received. Request a correction before filing when possible. A return prepared from a known incorrect information statement can create matching and substantiation problems later.

A practical filing workflow

1. Confirm the tax year. Code TT is a 2026 W-2 reporting code. Transitional 2025 methods are not the same as the 2026 reporting rule.
2. Identify every Code TT entry. Box 12 may use more than one line and more than one employer may issue a W-2.
3. Check the concept, not only the total. Compare the reported premium with FLSA overtime records and the employer's regular-rate method.
4. Resolve discrepancies. Ask for a W-2c when the employer confirms an error.
5. Apply return-level rules. Use Schedule 1-A and the 2026 Form 1040 instructions, including the annual limit, filing-status requirement and MAGI phaseout.
6. Keep evidence. Retain W-2s, W-2cs, pay statements and calculations with the return records.

This workflow keeps payroll reporting separate from the employee's deduction computation. Tax software may import Code TT, but the filer remains responsible for checking the return and responding to questions about an unusual or corrected amount.

Worked examples

Example 1: Code TT is smaller than total overtime pay

Jamie earns a $20 regular rate and works five FLSA overtime hours. Time-and-a-half pay for those hours is $150. The regular component is $100 and the extra one-half premium is $50. Assuming the hours and pay otherwise qualify, the relevant Code TT amount for that week is generally $50.

Example 2: Reported amount exceeds the deduction cap

Riley receives $18,000 of qualified overtime compensation and the employer properly reports $18,000 under Code TT. Before considering an income phaseout or other requirements, an individual filer's deduction is limited to $12,500. The W-2 still reports $18,000 because reporting and deduction limits serve different purposes.

Example 3: Joint return with two employees

Two spouses have $9,000 and $12,000 of properly reported qualified overtime compensation, for $21,000 total. The amount is below the $25,000 joint ceiling, but the actual allowed deduction still depends on the joint return's modified adjusted gross income and all eligibility requirements.

Example 4: Employer understated Code TT

An employer paid $10,000 of qualified overtime compensation but reported $5,000. After the employer issues a W-2c showing $10,000, the corrected amount can be used subject to the remaining rules. Without the employer correction, the August 2026 IRS guidance says the omitted $5,000 cannot simply be recreated on Form 4852 for this deduction.

Frequently asked questions

Primary sources and review notes

• IRS - 2026 General Instructions for Forms W-2 and W-3
• IRS Fact Sheet FS-2026-13 - qualified overtime compensation FAQs, August 2026
• IRS Publication 505 (2026) - Tax Withholding and Estimated Tax
• IRS Schedule 1-A (Form 1040)
• U.S. Department of Labor - overtime pay

Source rules and examples checked October 24, 2026. The IRS notes that its fact-sheet FAQs may be updated and that law controls individual tax liability. Recheck the final 2026 Form 1040 and Schedule 1-A instructions when filing. This guide is educational and is not individualized tax or legal advice.