Schedule1ADesk / 2026 Tax & Payroll Guides / W-2 Box 12 Code S (2026): SIMPLE IRA Salary Reduction Contributions & Schedule 1-A
W-2 Box 12 Code S (2026): SIMPLE IRA Salary Reduction Contributions & Schedule 1-A
What does W-2 Box 12 Code S mean on your 2026 Form W-2?
W-2 Box 12 Code S reports employee pre-tax salary reduction contributions to a SIMPLE IRA plan. Like Code D (401k), Code S deferrals reduce Box 1 wages and lower your 2026 Modified AGI so you can preserve more of your Schedule 1-A overtime and tip deductions.
W-2 Box 12 Code S reports employee pre-tax salary reduction contributions to a SIMPLE IRA plan. Like Code D (401k), Code S deferrals reduce Box 1 wages and lower your 2026 Modified AGI so you can preserve more of your Schedule 1-A overtime and tip deductions.
Open Interactive 2026 Schedule 1-A & W-2 Box 12 Calculator
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
What does W-2 Box 12 Code S mean on your 2026 Form W-2?
W-2 Box 12 Code S reports employee pre-tax salary reduction contributions to a SIMPLE IRA plan. Like Code D (401k), Code S deferrals reduce Box 1 wages and lower your 2026 Modified AGI so you can preserve more of your Schedule 1-A overtime and tip deductions.
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.