Form W-2 · Box 12 code TT · Tax year 2026

Overtime Premium Checker: Compare Code TT With Your Own Pay Stub Math

Box 12 of your 2026 W-2 may show code TT: the overtime premium your employer reported. This checker works out the premium from your own regular rate and overtime hours, and states the difference between the two figures. It compares numbers only. It cannot say which figure is right, and a difference, by itself, says nothing about how either figure was produced.

Last reviewed: November 3, 2026.

Compare the two figures

Amount in Box 12 of your W-2 with code TT (dollars) Your regular hourly rate (dollars per hour) Overtime hours in 2026 that the Fair Labor Standards Act required (hours)

Your premium is your rate, multiplied by these hours, multiplied by one half. That half is the whole point of the comparison: the premium is the extra half in time-and-a-half, not the full overtime rate.

Estimate only. This tool gives a general estimate based on the figures you entered and the published IRS rules cited on this page. It is not tax advice, it is not a tax return, and it cannot be relied on to avoid any tax penalty. Tax law and IRS guidance change. Confirm your figures against the current IRS instructions for the form you file, or ask a qualified tax professional.

Nothing you enter is sent anywhere. The calculation runs in your browser.

Why the reported figure matters in 2026

For 2026, the IRS states in Fact Sheet FS-2026-13 that the overtime deduction is generally limited to the amount the employer separately reported, which is the code TT amount. The same fact sheet describes one correction route: a corrected W-2, Form W-2c, issued by the employer. Those are the published rules. What they mean for any one W-2 depends on that employer's payroll records, which this page cannot see.

To turn the reported premium into an estimated deduction, with the $12,500 limit and the phaseout applied, use the overtime deduction calculator. To read code TT and the other W-2 codes, use the W-2 decoder.

Sources

Public Law 119-21, enacted July 4, 2025. Created the overtime premium deduction.
IRS, Fact Sheet FS-2026-13, August 6, 2026. States the 2026 reporting limit and the Form W-2c correction route. Source level: guidance, not binding legal authority.
IRS, Instructions for Forms W-2 and W-3, tax year 2026. Final version, posted January 30, 2026. Carries Box 12 code TT and its meaning.

Last reviewed: November 3, 2026.