Will ADP, Workday, or UKG automatically calculate W-2 Box 12 Code TT?

As of June 2026, no major payroll vendor has published documentation that flagship systems will automatically compute the FLSA-qualified overtime premium and populate Code TT without customer-side configuration. ADP, Paylocity, Oracle PeopleSoft, Ceridian Dayforce, UKG, Workday, Paycom, and Tyler Munis have published guidance or configuration steps — not shipped FLSA-compliant automation.

Can employers use the one-third overtime approximation on 2026 W-2s?

No. Notice 2025-69 allowed individual taxpayers to estimate one-third of total overtime on 2025 personal returns when employers were not required to report separately. For tax year 2026 W-2s, employers must report the actual FLSA overtime premium — the "half" in time-and-a-half — not a one-third approximation.

What portion of overtime qualifies for Public Law 119-21 deduction and Code TT reporting?

Under IRC §225(c)(1), only the premium portion qualifies — the extra "half" above the regular rate in time-and-a-half pay. If an employee earns $20/hour base and $30/hour overtime, only the $10 premium per hour qualifies. The base-rate portion of overtime does not.

What are the IRS penalties for incorrect Code TT reporting on W-2s?

IRC §6721 (failure to file correct information returns) and §6722 (failure to furnish correct payee statements) penalties stack separately. Per-W-2 penalties for 2026 returns range from $60 (corrected within 30 days) to $680 (intentional disregard, no aggregate cap). A 400-employee employer with errors on every form could face $24,000 to $544,000 combined exposure.

What should employers do if their payroll vendor cannot compute Code TT?

Employers need a compliance layer on top of existing payroll that ingests time data, applies the FLSA-correct weighted average regular rate, isolates the 0.5x premium, and produces a defensible per-employee Code TT figure — without waiting for a vendor roadmap or replacing the ERP.

The W-2 Box 12 Problem Nobody Is Talking About

As of June 2026, no major payroll vendor ships automated FLSA-compliant Code TT computation. Employers must produce the qualified overtime premium themselves — or face stacked IRS penalties.

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