No W-2 Code Yet? Estimate Your Overtime Premium From Paystubs — and the Records to Keep (2026)

When the IRS releases the new Schedule 1-A form for 2026 (draft version posted September 4, 2026), certain deduction boxes are filled in automatically by employer reporting. But the overtime premium box — linked to W-2 Box 12 code TT — is expected to transition in phases. If your employer hasn't reported code TT on your 2026 Form W-2 yet, you can still estimate the premium from your paystubs.

Below is the step-by-step paystub method, the math behind time-and-a-half and double time, and the records taxpayers generally keep for each related deduction type.

Why You Might Not Have a TT Number Yet

Under the phased implementation plan for the 2026 Schedule 1-A transition, not every employer will report W-2 Box 12 code TT on the same schedule. Large employers are generally expected to lead, with smaller employers following in later filing phases. This phased approach means some taxpayers may receive a W-2 for 2026 that lacks the TT code entirely, even though their pay includes overtime.

The draft transition relief referenced on the September 4, 2026 posting allows taxpayers whose employers do not report the code to compute the premium themselves from payroll records. The estimate is not permanent; when code TT is eventually supplied, taxpayers generally compare the two figures and adjust.

The Paystub Method, Step by Step

1. Gather every paystub you received in calendar year 2026 — the final one is especially important because it should match your W-2.
2. Locate the overtime pay amount reported for each pay period. This is typically labeled "OT Pay" or "Overtime Earnings" and reflects gross (pre-tax) overtime wages, not the number of hours.
3. Sum all 2026 overtime pay entries to get your total overtime pay for the year.
4. Apply the multiplier that matches your overtime rate:

For mixed rates — for example, 1.5x on weekdays and 2.0x on holidays — taxpayers generally do the calculation per pay period and add the results together rather than applying a single factor to the yearly total.

Tip: The S1A Calculator includes an estimate mode switch that lets you enter the same paystub figures above and auto-compute the premium, with a toggle to compare against code TT once it appears.

Only the FLSA-Required Premium Counts

The deduction is intended to capture the required overtime premium, not every extra dollar paid. If an employer pays above the federally required rate, only the portion that equals the required premium counts — the "1/3" or "1/2" figures above reflect exactly that required portion.

Common pay items that are not automatically part of the overtime premium include:

• Voluntary shift differentials or longevity bonuses that exceed what the FLSA requires
• Weekend or holiday bonuses that are not structured as premium wage rates
• Pay for non-overtime hours worked on a holiday

When a paystub line blends overtime wages with one of these non-premium items, taxpayers generally separate them by the hours and rate that produced each component before applying the 1/3 or 1/2 multiplier.

Records to Keep per Deduction

Because these boxes tie to specific W-2 and information-document codes, the supporting records differ by deduction type.

• Tips (W-2 Box 12 code TP): maintain a daily tip diary or log, copy of Form W-2 showing code TP in Box 12, any Forms 1099 reporting tip income, and ordinary-and-necessary business expense records if tips were reported on Schedule C.
• Overtime premium (code TT): keep the final 2026 paystub and the year's paystubs used in the estimate, plus the W-2 itself once received (showing whether TT is reported and for how much).
• Vehicle loan (Form 1098-VLI): retain the Form 1098-VLI, the full loan statement, the VIN, and proof of U.S. final assembly (such as the window sticker or dealer documentation) — all documents that establish eligibility.
• Senior-related deductions: keep the applicable Social Security numbers on file and any benefit or age-verification statements the filing position requires.

Refer to the W-2 Box 12 Guide for the full mapping of these codes and to the Records Guide for retention templates and examples.

How Long to Keep Records

IRS guidance generally requires taxpayers to keep records for three years from the date the return is filed, since that is the typical period during which assessments and examinations may occur. However, because the Schedule 1-A transition is new and employers may report code TT retroactively, taxpayers generally keep the paystub and supporting documentation for longer — for example, until the extended period or any subsequent amendment window closes. Retaining copies of both the 2026 paystubs and the final W-2 for several years is the safest approach.

Estimate Now, Confirm Later

Not having a TT number does not mean the deduction is unavailable — it means the figure needs to be derived from payroll records until code TT is supplied. Enter your 2026 overtime pay into the S1A Calculator, toggle estimate mode, and revisit the result once your W-2 arrives to confirm the reported amount matches your paystub-based estimate.