Code TT in box 12 of your Form W-2 shows your qualified overtime: the part of your overtime pay above your regular rate that the Fair Labor Standards Act requires. From tax year 2026 you use that figure on Schedule 1-A to work out a federal deduction of up to $12,500, or $25,000 on a joint return.

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This guide explains who receives Code TT, how the amount is calculated by payroll software, how to report it on Schedule 1-A of Form 1040, how the statutory caps and income phase-outs apply, and what actions to take if your employer made an error or omitted the code.

What is W-2 box 12 code TT for qualified overtime?

Public Law 119-21 (the One, Big, Beautiful Bill Act) added section 225 to the Internal Revenue Code, creating a temporary federal income tax deduction for qualified overtime compensation earned from 2025 through 2028. To administer this provision, the Internal Revenue Service introduced Code TT for Box 12 of Form W-2, beginning with the 2026 tax year.

Under the General Instructions for Forms W-2 and W-3, employers must use Box 12 with Code TT to report the total amount of qualified overtime compensation paid to each employee during the calendar year. The statutory definition under section 225 restricts qualified overtime compensation to compensation required under section 7 of the Fair Labor Standards Act (FLSA) of 1938 that is in excess of the employee's regular rate of pay.

This definition means that only the overtime premium portion (the extra 0.5 in standard 1.5 time-and-a-half pay for hours worked beyond 40 in a workweek) qualifies as Code TT pay. The regular base pay (the 1.0 portion) is regular taxable compensation and cannot be included under Code TT. In addition, overtime premiums paid solely due to employer policy, voluntary contracts, or state daily overtime rules that do not correspond to federal FLSA weekly overtime cannot be reported under Code TT.

FLSA weekly overtime premium = (FLSA hours worked over 40) × 0.5 × (FLSA regular rate) Annual Code TT amount = Sum of FLSA weekly overtime premiums for all workweeks in the tax year Schedule 1-A limit = Smaller of Code TT total and $12,500 ($25,000 for married filing jointly) MAGI phase-out reduction = $100 for each full $1,000 of MAGI above $150,000 ($300,000 joint) Allowable deduction = Maximum of $0 and (After-limit amount minus MAGI phase-out reduction)

Who qualifies to claim the Code TT deduction?

Not every worker who receives overtime pay is eligible to claim the deduction on their federal tax return. Under section 225(d), an individual claiming the qualified overtime deduction must have a valid Social Security number issued for employment before the due date of the return. Taxpayers filing with an Individual Taxpayer Identification Number (ITIN) are not eligible to claim the deduction.

Married taxpayers must file a joint return to claim the deduction under federal rules. A taxpayer who is married filing separately cannot claim the section 225 deduction unless they meet the strict legal exceptions that allow a separated spouse to file as head of household.

The deduction is available whether you itemize or take the standard deduction (FS-2026-13, Q1). It does not lower adjusted gross income: the 2025 Schedule 1-A starts from your adjusted gross income on Form 1040, line 11b, and sends its total to Form 1040, line 13b. Check the line numbers on the 2026 form when it is issued.

How do you report box 12 code TT on Schedule 1-A?

When preparing your 2026 federal income tax return in early 2027, you do not transfer Box 12 Code TT directly onto Form 1040. Instead, you enter the amount on Schedule 1-A (Form 1040), Part III.

IRS Fact Sheet FS-2026-13 confirms that taxpayers must enter the full amount reported on Form W-2 in Box 12 using Code TT on Schedule 1-A. The form then applies the statutory limitations:

  • Statutory dollar cap: The maximum allowable qualified overtime deduction is capped at $12,500 per return for single, head of household, and qualifying surviving spouse filers. For married couples filing jointly, the joint limit is $25,000, regardless of whether one spouse or both spouses earned qualified overtime.
  • Income phase-out threshold: The deduction phases out for higher earners. If your modified adjusted gross income (MAGI) exceeds $150,000 ($300,000 for married filing jointly), the allowable deduction is reduced by $100 for each full $1,000 of MAGI above the threshold.
  • Full phase-out point: A single filer with the full $12,500 deduction is completely phased out at $275,000 of MAGI. A joint filer with $25,000 of qualified overtime is completely phased out at $550,000 of MAGI.

What should you do if box 12 code TT is incorrect or missing?

Under section 225(a) of the Internal Revenue Code, an employee can only deduct qualified overtime compensation that was separately stated on a statement furnished pursuant to section 6051(a)(19), which is Form W-2. You cannot claim an estimated amount or reconstruct your overtime from paystubs if your employer omitted Code TT from your Form W-2.

IRS Fact Sheet FS-2026-13 provides strict instructions for handling discrepancies:

  1. Contact your employer payroll department: If Box 12 is missing Code TT or if the dollar figure is lower than your actual FLSA overtime premium pay, you must request a Form W-2c (Corrected Wage and Tax Statement) from your employer.
  2. No substitute forms allowed: The IRS explicitly states in FS-2026-13 that an employee cannot use Form 4852 (Substitute for Form W-2) to invent, increase, or claim qualified overtime compensation that the employer refused or failed to report on Form W-2. Form 4852 does not satisfy section 6051(a)(19).
  3. Employer reporting penalties: Employers who fail to provide accurate Forms W-2 with required Code TT reporting may be subject to information reporting penalties under the tax code.
  4. If the employer reported too much: You may only consider the qualified overtime you were actually paid, not the higher figure on the form (FS-2026-13, Q21). Ask your employer for a Form W-2c.

Find your case

Review the table below to determine how your filing status and payroll situation affect your Box 12 Code TT deduction.

Filing Situation Code TT Reporting Rule Annual Cap MAGI Phase-Out Threshold
Single hourly worker Reports FLSA overtime premium hours over 40 $12,500 $150,000
Married filing jointly (one spouse works overtime) Single Form W-2 with Code TT $25,000 $300,000
Married filing jointly (both spouses work overtime) Combine Code TT amounts from both Forms W-2 $25,000 $300,000
Head of household Reports FLSA overtime premium hours over 40 $12,500 $150,000
Married filing separately Not eligible to claim deduction under federal rules $0 Not applicable
ITIN filer Not eligible to claim deduction under section 225(d) $0 Not applicable

Worked examples

These three worked examples demonstrate how the WebFusionTools calculator applies federal rules, statutory limits, and income thresholds to determine your final tax deduction.

Example 1: Single healthcare worker with typical overtime

An hourly emergency medical technician receives $4,800.00 of qualified overtime compensation reported in Box 12 with Code TT on Form W-2. Her modified adjusted gross income is $65,000, placing her in the 12% marginal federal tax bracket.

Calculation Step Rule and Application Result
Qualified overtime for the year W-2 Box 12 Code TT amount $4,800.00
Limit (per return) Single filer annual cap under section 225 $12,500
After the limit Smaller of $4,800.00 and $12,500 cap $4,800.00
MAGI over $150,000 $65,000 MAGI minus $150,000 threshold $0.00
Reduction: $100 for each full $1,000 No phase-out applies below threshold $0.00
Estimated federal income tax saved at 12% $4,800.00 deduction multiplied by 12% bracket $576.00

Example 2: Married couple filing jointly with two overtime jobs

A dual-income married couple files a joint federal tax return. Spouse A works in manufacturing and has $10,000.00 in Box 12 with Code TT on his Form W-2. Spouse B works as an hourly retail supervisor and has $8,000.00 in Box 12 with Code TT on her Form W-2. Their combined modified adjusted gross income is $180,000, placing them in the 22% federal tax bracket.

Calculation Step Rule and Application Result
Qualified overtime for the year Spouse A Form W-2 Box 12 Code TT $10,000.00
Your spouse's qualified overtime Spouse B Form W-2 Box 12 Code TT $8,000.00
Combined on the joint return Total of both W-2 Code TT entries ($10,000.00 + $8,000.00) $18,000.00
Limit (joint return, both spouses together) Joint filer statutory cap under section 225 $25,000
After the limit Smaller of $18,000.00 and $25,000 cap $18,000.00
MAGI over $300,000 $180,000 MAGI minus $300,000 threshold $0.00
Reduction: $100 for each full $1,000 No phase-out applies below joint threshold $0.00
Estimated federal income tax saved at 22% $18,000.00 deduction multiplied by 22% bracket $3,960.00

Example 3: Industrial specialist capped at $12,500 with MAGI phase-out

A specialized refinery operator earns substantial overtime during scheduled plant maintenance. His Form W-2 reports $15,000.00 in Box 12 with Code TT. Because his total annual earnings and investments result in a modified adjusted gross income of $170,000, his deduction is affected by both the statutory dollar cap and the income phase-out. He files as single in the 24% tax bracket.

Calculation Step Rule and Application Result
Qualified overtime for the year W-2 Box 12 Code TT amount $15,000.00
Limit (per return) Single filer annual cap, which applies here $12,500
After the limit Capped amount before income reduction $12,500.00
MAGI over $150,000 $170,000 MAGI minus $150,000 threshold $20,000.00
Reduction: $100 for each full $1,000 20 units of $1,000 multiplied by $100 $2,000.00
Estimated federal income tax saved at 24% $10,500.00 deduction multiplied by 24% bracket $2,520.00

Common mistakes with code TT reporting

Taxpayers and payroll clerks frequently make errors when handling the new Box 12 Code TT rules. Watch out for these four common issues:

  • Entering total overtime wages instead of the premium: Code TT represents only the premium pay in excess of the regular hourly rate. The base portion of pay cannot be deducted. If your form shows total overtime pay, ask your employer to correct it.
  • Confusing state daily overtime with federal FLSA overtime: In states like California, daily overtime is paid for hours over 8 in a single day even if total weekly hours do not exceed 40. However, section 225 strictly requires FLSA compliance. If total workweek hours are 40 or fewer, no federal FLSA overtime occurred, and the amount cannot be reported under Code TT.
  • Attempting to file Form 4852 when Code TT is missing: If your employer failed to include Code TT, submitting substitute Form 4852 is prohibited by the IRS for section 225 deductions. You must obtain Form W-2c from your payroll office.
  • Assuming the deduction eliminates FICA payroll taxes: Section 225 provides an income tax deduction, not an exemption from payroll taxes. Social Security and Medicare payroll taxes continue to apply to all overtime earnings without reduction.

Frequently asked questions

Code TT reports the total qualified overtime compensation paid to an employee during the calendar year under section 7 of the Fair Labor Standards Act, representing the premium portion above regular hourly pay.
No. Under section 225(a), qualified overtime must be separately reported on Form W-2. If your employer omitted it, you must request a corrected Form W-2c. You cannot use substitute Form 4852.
The statutory limit is $12,500 for single, head of household, and qualifying surviving spouse filers, and $25,000 for married couples filing a joint tax return.
The deduction begins phasing out at modified adjusted gross income of $150,000 for single filers and $300,000 for joint filers, reducing by $100 for each full $1,000 of excess MAGI.
Under federal tax rules, married taxpayers must file a joint return to claim the qualified overtime deduction. Married filing separately taxpayers are generally ineligible.

Sources

This guide provides general tax information and is not formal tax advice. For complex payroll situations or disputed wage claims, consult a qualified CPA, tax attorney, or the IRS. WebFusionTools follows an independent editorial standard outlined in our editorial policy.

Rules checked against the official text on 30 October 2026.