Schedule1ADesk / 2026 Tax & Payroll Guides / W-2 Box 12 Code AA (2026): Designated Roth 401(k) Contributions vs. Pre-Tax Code D
W-2 Box 12 Code AA (2026): Designated Roth 401(k) Contributions vs. Pre-Tax Code D
Does W-2 Box 12 Code AA (Roth 401k) lower your MAGI for Schedule 1-A?
No. W-2 Box 12 Code AA reports after-tax Roth 401(k) contributions. Unlike pre-tax Code D 401(k) deferrals, Code AA Roth contributions do not reduce your current-year Modified AGI for the $150,000 / $300,000 Schedule 1-A overtime and tip deduction phase-out.
No. W-2 Box 12 Code AA reports after-tax Roth 401(k) contributions. Unlike pre-tax Code D 401(k) deferrals, Code AA Roth contributions do not reduce your current-year Modified AGI for the $150,000 / $300,000 Schedule 1-A overtime and tip deduction phase-out.
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2026 Form W-2 Box 12 & Schedule 1-A Reference Table
| W-2 Box / IRS Schedule | 2026 Reporting & Deduction Rule |
|---|---|
| Box 12 Code TT (New for 2026) | Qualified FLSA 0.5x Overtime Premium · Deduct up to $12,500 Single / $25,000 MFJ on Schedule 1-A Part III |
| Box 12 Code TP + Box 14b TTOC (New for 2026) | Qualified Voluntary Tips in 75 TTOC Occupations · Deduct up to $25,000 on Schedule 1-A Part II |
| Box 12 Code D / S / E / G | Pre-tax 401(k), SIMPLE IRA, 403(b), and 457(b) deferrals · Lowers MAGI to prevent Schedule 1-A phase-out |
| Box 12 Code W | Employer + Employee pre-tax HSA contributions · Excluded from Box 1 wages and lowers MAGI |
| Box 12 Code DD | Informational cost of employer-sponsored health coverage · Non-taxable |
| Form 1098-VLI (Schedule 1-A Part IV) | Up to $10,000 deduction for interest on new U.S.-assembled passenger vehicles (VIN starts with 1, 4, 5, or 7) |
| Schedule 1-A Part V (Age 65+ Bonus) | $6,000 per spouse age 65+ ($12,000 joint) · Phases out above $75,000 Single / $150,000 MFJ |
Frequently Asked Questions
Does W-2 Box 12 Code AA (Roth 401k) lower your MAGI for Schedule 1-A?
No. W-2 Box 12 Code AA reports after-tax Roth 401(k) contributions. Unlike pre-tax Code D 401(k) deferrals, Code AA Roth contributions do not reduce your current-year Modified AGI for the $150,000 / $300,000 Schedule 1-A overtime and tip deduction phase-out.
Do I have to itemize deductions to claim W-2 Box 12 Code TT or Code TP?
No. All four deductions on 2026 IRS Schedule 1-A (Qualified Tips, Qualified Overtime, Auto Loan Interest, and the $6,000 Senior Deduction) are above-the-line deductions available to both Standard Deduction and Itemized filers.