W-2 code TT: Nondiscretionary bonuses

Short answer: A promised bonus (production, attendance, retention) is part of the regular rate. Spread it over the weeks it was earned in; each overtime week then owes half of its share ÷ its hours for each overtime hour. That extra premium is code TT in the year the bonus is paid.

Example
A $260 quarterly bonus covers 13 weeks: $20 a week. In the week with 50 hours the extra premium is 0.5 × ($20 ÷ 50) × 10 = $2. Paid with the bonus in April, it goes on that year's W-2.

The rules

Work it out for your payroll
The free code TT calculator does this per workweek for one employee or a whole payroll CSV, with bonuses spread back and weeks split by pay date. It runs in your browser.

Sources

Not tax or legal advice. Facts checked 27 Oct 2026 against the IRS FAQs (FS-2026-13) and the FLSA regulations.

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