How Does Box 12 Code DD Affect Your Taxes? Blanks and Errors

The dollar figure shown in Box 12 with Code DD on your W-2 is not taxable. It reports the total cost of your employer-sponsored health coverage, combining what your employer paid and what came out of your paychecks, and it exists purely for your information. It does not get added to your wages, does not appear on any line of Form 1040, and does not change your refund or balance due.

Why the Amount Is on Your W-2

The Affordable Care Act added a disclosure rule to federal tax law requiring employers to show the “aggregate cost of applicable employer-sponsored coverage” on each employee’s W-2.¹ The IRS describes the reporting as informational, meant to give employees “useful and comparable consumer information on the cost of their health care coverage.”²

Federal law separately excludes employer-provided health coverage from gross income.³ The 2026 W-2 instructions state directly that “the amount reported with code DD is not taxable,”⁴ and the IRS confirms the amount “does not affect tax liability.”⁵ It sits outside Box 1 wages, outside adjusted gross income, and outside the base for Social Security and Medicare tax.

Why the Number Looks So High

The figure combines everything spent on your health plan: your employer’s share plus your payroll deductions. Since the employer’s contribution is usually the larger piece and never shows up on a pay stub, seeing the full price for the first time can be jarring. That’s the point of the disclosure.

Coverage that generally counts toward Code DD includes major medical (fully insured or self-funded plans subject to federal COBRA), Health Reimbursement Arrangements integrated with your medical plan, and multi-employer union plans.²

Several benefits are excluded from the Code DD total:

HSA contributions, which appear separately under Code W.⁴
Archer MSA contributions, reported under Code R.
Health FSA amounts funded solely by your own pre-tax salary reductions.²
Standalone dental and vision plans that aren’t integrated with your medical coverage.
Long-term care insurance, regardless of how it’s funded.
Hospital indemnity and specified illness policies, whether paid pre-tax or after-tax.²

How to Enter Code DD on Your Return

In tax software, type the Code DD amount exactly as it appears on your W-2. The software needs the entry to match what your employer filed, but it will not carry the number into your taxable income or adjust your refund. Code DD does not flow to any line of Form 1040.⁴

If you file a paper return, you don’t need to transfer the Code DD amount anywhere. The IRS already has it from your employer’s filing, and the number is kept for tracking purposes rather than tax calculation.⁵

What It Means If Code DD Is Blank

Not every W-2 shows a Code DD amount. Reporting is currently required only from employers who filed 250 or more W-2s for the prior calendar year. A transition relief rule has exempted smaller employers since 2012 and remains in effect indefinitely, with the IRS committing to at least six months’ notice before expanding the rule.⁶

Smaller employers may report voluntarily, and some do. A missing Code DD entry usually just means your employer files fewer than 250 W-2s. It doesn’t mean you lack health coverage or that your W-2 is wrong.²

Other Box 12 Codes That Do Affect Your Taxes

Confusion around Code DD partly comes from other codes in the same box that behave very differently. Some common ones:

Code D (traditional 401(k) deferrals): excluded from Box 1 wages, which reduces your current taxable income.
Code W (HSA contributions): not taxable if contributions stay within IRS limits.
Code AA (Roth 401(k) contributions): already included in Box 1 wages because Roth contributions are made after tax.
Code BB (Roth 403(b) contributions): same treatment as Code AA.
Code DD (health coverage cost): not taxable and not in Box 1.⁴

Code DD is the only one of these that never touches your taxable income in either direction. It doesn’t reduce it, and it isn’t already baked into it.

Code DD and Marketplace Subsidy Eligibility

Having employer-sponsored coverage reported under Code DD does not directly affect eligibility for a Premium Tax Credit through the health insurance marketplace. The Code DD amount is not part of the affordability calculation. That test looks at what you would pay for the cheapest plan your employer offers, compared to your household income. For 2026 coverage, employer coverage is considered “affordable” if your share of the lowest-cost plan is less than 9.96% of household income.⁷

Code DD reports the total price of the plan. The subsidy affordability test looks only at your personal share of the cheapest option. Two different numbers, and only the second one matters for a marketplace subsidy.

If the Code DD Amount Looks Wrong

Because Code DD is informational, small discrepancies don’t create a tax problem. If the amount is clearly wrong, though — a zero when you had coverage all year, or a figure far outside what your plan would cost — ask your employer’s payroll or HR office to review it. The employer can issue a corrected W-2 (Form W-2c) and file the correction with the Social Security Administration.

An incorrect Code DD entry doesn’t change what you owe or what you get back, so there’s no reason to hold up filing your return while you wait for the correction. The fix runs between your employer and the IRS and won’t touch your 1040.

1
GovInfo. 26 U.S. Code 6051 – Receipts for Employees
2
Internal Revenue Service. Form W-2 Reporting of Employer-Sponsored Health Coverage
3
Office of the Law Revision Counsel. 26 U.S. Code 106 – Contributions by Employer to Accident and Health Plans
4
Internal Revenue Service. 2026 General Instructions for Forms W-2 and W-3
5
Internal Revenue Service. Reporting Employer-Provided Health Coverage on Form W-2
6
Internal Revenue Service. Employer-Provided Health Coverage Informational Reporting Requirements: Questions and Answers
7
HealthCare.gov. Affordable Coverage – Glossary