W-2 Box 12 Code DD — Cost of employer-sponsored health coverage
The total cost (employer + employee share) of your employer-sponsored group health coverage. Informational only — does not affect your tax.
At a glance — Box 12 Code DD
- Box name
- Cost of employer-sponsored health coverage
- Reports to
- None — informational only.
- Check against
- Your year-end benefits statement or HR total-premium summary — code DD should reflect the combined employer-plus-employee cost of your medical coverage for the year. Standalone dental or vision premiums may or may not be included, since reporting those separately is optional for employers.
What Box 12 Code DD means
Code DD reports the total annual cost of your employer-sponsored group health coverage — not what came out of your paycheck, but the full premium: your employer's share plus whatever you paid through pre-tax payroll deductions, combined into one figure. The Affordable Care Act added this requirement so employees can see the full cost of their coverage, similar to how an itemized receipt shows the price before a discount is applied.
Code DD is purely informational. It does not add anything to Box 1, Box 3, or Box 5, it is not itself taxable income, and it isn't entered anywhere on Form 1040 or any schedule. The IRS is explicit that nothing about the reporting requirement causes excludable employer-provided health coverage to become taxable — the figure exists so you (and, separately, the IRS when checking ACA employer-mandate compliance) can see the number, not so it can be taxed.
It routinely looks larger than anything else on the form because it isn't your cost alone — it's the plan's full annual price for whichever coverage tier you're enrolled in (self-only, self-plus-one, or family), most of which your employer is quietly absorbing on your behalf. It is not the same figure as your HSA contributions (code W), your FSA elections (already excluded from Box 1 without a separate Box 12 entry), or anything on Form 8962's premium tax credit reconciliation — those are different benefits, computed differently.
Not every W-2 carries a code DD amount. Under ongoing IRS transition relief (Notice 2012-9), an employer that filed fewer than 250 Forms W-2 for the prior calendar year isn't required to report code DD at all, and that relief stays in effect until the IRS says otherwise — smaller employers can and often do leave it blank even though they offer health coverage. Standalone dental or vision coverage that isn't bundled into the main medical plan, or that participants can decline separately, is also optional for an employer to include in the total.
Tax return implications
- Zero effect on your tax liability, refund, or AGI — code DD is informational only.
- Not entered anywhere on Form 1040, Schedule 1, or any other form — leave it off your return entirely.
- May be used by the IRS to check employer compliance with the ACA's employer shared-responsibility (mandate) rules — that's an employer-side check, not something that touches your individual return.
- Useful for comparing your total cost of employer coverage against ACA marketplace alternatives, since it captures the full premium rather than just your payroll deduction.
- A missing code DD doesn't mean anything is wrong with your W-2 — it usually just means your employer qualifies for the small-employer transition relief.
Common pitfalls & things to check
- Don't mistake code DD for money you paid or can deduct — it's the combined employer-plus-employee premium, and the employer-paid portion is typically the larger share.
- Only an employer that filed 250 or more Forms W-2 for the prior year is required to report code DD; a blank box on a small employer's W-2 doesn't mean you have no coverage.
- Code DD is not the same thing as code W (HSA contributions) — one describes your health insurance premium, the other describes money set aside for medical expenses, and the two figures are never the same amount.
- Standalone dental- or vision-only coverage may or may not be folded into the code DD total depending on how your employer's plan is structured — don't assume the number captures every health-related benefit you have.
- If code DD looks unusually high, check your coverage tier (self-only vs. family) before assuming an error — family-tier premiums run well above self-only rates at most employers.
FAQ
Is Box 12 code DD taxable?
No. It's informational only — it doesn't change your Box 1 wages, doesn't reduce your refund, and doesn't get entered anywhere on your tax return.
What does DD mean on a W-2?
It's the total annual cost of your employer-sponsored group health coverage — your employer's contribution plus whatever you paid through payroll — reported because the ACA requires it, not because it affects your taxes.
Why is my Box 12 DD so high?
It isn't your cost alone — it's the full premium for your coverage tier, employer share included, and the employer-paid portion is typically the larger part of that total. Family-tier coverage in particular runs well into five figures a year at most employers.
What's the difference between code W and code DD?
Code W is money contributed to your HSA — your pre-tax payroll amount plus anything your employer added — and feeds Form 8889. Code DD is the total cost of your health insurance premium and feeds nothing on your return; it's for information only.
Related W-2 boxes
Box 12 — Codes (401(k), HSA, health coverage, ISO, and more)
Up to four labeled amounts (12a–12d) using IRS codes. Common codes: D (401(k) elective deferral), DD (employer health coverage cost), W (employer + employee HSA contributions), AA (Roth 401(k)).
Box 12 Code D — Elective deferrals to a 401(k) plan
Your traditional (pre-tax) 401(k) elective deferrals. Reduces Box 1 dollar-for-dollar, up to the annual §402(g) elective deferral limit (higher with age-50 catch-up and SECURE 2.0 ages-60–63 super-catch-up).
Box 12 Code E — Elective deferrals to a 403(b) plan
Your traditional (pre-tax) 403(b) elective deferrals. Reduces Box 1 up to the annual §402(g) limit, with a special 15-year catch-up for long-tenured employees of certain nonprofits.
Box 12 Code W — Employer and employee HSA contributions
Total Health Savings Account contributions — both employer and employee (via pre-tax payroll). Capped at the §223 annual HSA limit for your HDHP coverage tier, plus the $1,000 age-55+ catch-up under §223(b)(3)(B)(ii).
Reconciling your W-2 at tax time? Use the paycheck calculator to verify expected federal, Social Security, and Medicare withholdings on your salary, and the federal income tax calculator to estimate your refund or balance owing before you file.
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Sources
W-2 box definitions per IRS General Instructions for Forms W-2 and W-3 and IRC §6051. Rates and thresholds current for tax year 2025 (file by April 15, 2026); 2026 figures included where published.