Why is Box 12 (Code Q or W) different this year on my W-2?

Meta description: Box 12 changes year to year because of elections, IRS limit indexing, and mid-year enrollment. Here's how to read commuter and HSA codes on your W-2.

Target keywords: W-2 Box 12, Box 12 Code Q, Box 12 Code W, commuter benefits W-2, W-2 codes explained

Footnote stack: Savings estimates, Tax & legal advice

Body

Box 12 on your W-2 reports specific pretax items using single- or double-letter codes. The amount can change year over year for three reasons: you elected a different amount, the IRS indexed the annual cap, or you enrolled (or stopped) partway through the year. Commuter pretax benefits do not have a dedicated W-2 box; they reduce your Box 1 taxable wages directly. The most commonly referenced Box 12 codes are:

Code W: Employer + employee HSA contributions

Code W shows the combined employer-and-employee contributions to a Health Savings Account through a cafeteria plan. If you saw a number last year and don't this year, you may have switched plans or stopped HSA contributions. (Alice does not currently administer HSA; this code is unrelated to your Alice commuter benefit.)

Code Q: Nontaxable combat pay

Code Q is military-specific. Unrelated to commuter.

Where your commuter benefit shows up

Pretax §132(f) commuter contributions reduce your Box 1 wages (federal taxable income) and your Boxes 3 and 5 (Social Security and Medicare wages) directly. They are not listed in Box 12. If you elected $200/month for transit all year, that's $2,400 of wages that never appeared in Box 1.

Why your numbers can shift

Three common reasons: (1) you changed your election mid-year, (2) the IRS indexed the monthly cap upward (2026 = $340; 2025 = $325), (3) you joined or left the program partway through the year.

Will this affect my tax return?

Generally no. Commuter pretax reduces your wages before they hit your tax return. You don't separately claim commuter benefits on Form 1040. See Article 22.

Employees with W-2 questions: support@thisisalice.com or (888) 431-4355. Consult your tax preparer for return-specific guidance.

Savings shown or implied, including any reference to "cash back" or take-home pay, are illustrative. Actual savings depend on your tax rate, benefit elections, and eligible spending each pay period. Alice does not provide tax, legal, or financial advice. Consult your own tax preparer, lawyer, or financial advisor for guidance specific to your situation.