Updated October 17, 2026. Quick answer: The Retirement plan checkbox in box 13 of Form W-2 is checked when the employer treats you as an active participant in one of the listed plans for any part of the year, such as a 401(k) plan. The Instructions for Employee on the form say that when it is checked, special limits may apply to the amount of traditional IRA contributions you may deduct. The box does not show a dollar amount.
What the Retirement plan checkbox says
The second checkbox in box 13 is a yes or no indicator. The employer-side instruction reads: the employer is told to check the box if the employee was an active participant “(for any part of the year) in any of the following.” A checked box on your W-2 therefore does not say how much you or your employer put into a plan. It says the employer treated you as an active participant in a qualifying plan.
The dollar amounts for deferrals and contributions are reported elsewhere, in box 12, which is explained on the box 12 codes page. The checkbox, the codes and the other boxes in this range are laid out in the W-2 boxes 10 to 20 guide.
Which plans count
The instructions list seven kinds of plan. They are reproduced here so you can match the name of your own plan to the list.
| Plan type | How the instructions list it |
|---|---|
| Section 401(a) plan | “A qualified pension, profit-sharing, or stock-bonus plan described in section 401(a) (including a 401(k) plan).” |
| Section 403(a) annuity plan | “An annuity plan described in section 403(a).” |
| Section 403(b) contract or account | “An annuity contract or custodial account described in section 403(b).” |
| SEP plan | “A simplified employee pension (SEP) plan described in section 408(k).” |
| SIMPLE retirement account | “A SIMPLE retirement account described in section 408(p).” |
| Section 501(c)(18) trust | “A trust described in section 501(c)(18).” |
| Government plan | “A plan for federal, state, or local government employees or by an agency or instrumentality thereof (other than a section 457(b) plan).” |
The instructions add a specific exclusion: “Do not check this box for contributions made to a nonqualified or section 457(b) plan.” Nonqualified deferred compensation has its own box, box 11, which is covered on the box 11 page.
What active participant means
The instructions define the phrase this way: “Generally, an employee is an active participant if covered by (a) a defined benefit plan for any tax year that they are eligible to participate in, or (b) a defined contribution plan (for example, a section 401(k) plan) for any tax year that employer or employee contributions (or forfeitures) are added to their account.”
Two practical points follow from the text. First, a defined contribution plan such as a 401(k) counts you as an active participant for a year in which contributions or forfeitures are added to your account. Second, for a defined benefit plan the test is eligibility to participate. For help with a specific plan, the instructions say: “For additional information on employees who are eligible to participate in a plan, contact your plan administrator.”
What the form tells the employee
The Instructions for Employee on the back of the form are short: “special limits may apply to the amount of traditional IRA contributions you may deduct. See Pub. 590-A.” The sentence begins by describing the checked box, and it sends you to Publication 590-A for the rules. It is a heads-up about a possible limit, not a statement that your deduction is reduced.
This page does not work out any deduction limit, because the form itself does not give one. The limits on what you can put into an employer plan are separate, and they are on the 401(k) contribution limits page, the 403(b) page and the 457(b) page. The way pre-tax and Roth deferrals show up in your paycheck is on the Roth vs pre-tax 401(k) paycheck page.
Reading the checkbox with the rest of your W-2
The checkbox sits in the same row as the other two box 13 indicators, and it is easy to skip past because it carries no amount. If you contribute to a workplace plan, compare it with the box 12 entries and your pay stubs: the checkbox and a box 12 code for contributions are separate pieces of reporting. If the box is blank when you expected it to be checked, or checked when you had no plan, ask the payroll department which plan they treated you as participating in.
Edition and box numbers
The primary read for this page is the 2025 edition of Form W-2, the one an employee receives in early 2026 for tax year 2025, together with the 2025 General Instructions for Forms W-2 and W-3 and the Notice to Employee and Instructions for Employee printed on the form. The 2026 edition was the one irs.gov served as current on October 17, 2026; the 2025 files come from the IRS prior-year archive. The retirement plan checkbox text is the same in the 2026 edition of the General Instructions, which still says “Do not check this box for contributions made to a nonqualified or section 457(b) plan.” The 2026 form’s Instructions for Employee repeat the box 13 note: “special limits may apply to the amount of traditional IRA contributions you may deduct”. The box number is 13 in both editions. Check the tax year printed on the form you received, because the box layout can change from one year to the next.
Common mistakes
- Reading the checkbox as a contribution amount. The instructions describe an active participant test, “(for any part of the year) in any of the following”, and the dollar amounts are reported elsewhere.
- Assuming a deferred compensation plan sets the box. The instructions say “Do not check this box for contributions made to a nonqualified or section 457(b) plan.”
- Assuming a checked box means your IRA deduction is gone. The form says only that “special limits may apply to the amount of traditional IRA contributions you may deduct”, and sends you to Pub. 590-A.
Related: the box 12 codes page, the 401(k) contribution limits page, the 403(b) page, the Roth vs pre-tax 401(k) paycheck page, and the 457(b) page.
Sources
- General Instructions for Forms W-2 and W-3 (2025): IRS archived PDF (irs.gov)
- Form W-2, Wage and Tax Statement (2025), with the Notice to Employee and Instructions for Employee: IRS archived PDF (irs.gov)
- General Instructions for Forms W-2 and W-3 (2026): https://www.irs.gov/pub/irs-pdf/iw2w3.pdf
- Form W-2, Wage and Tax Statement (2026), with the Notice to Employee and Instructions for Employee: https://www.irs.gov/pub/irs-pdf/fw2.pdf
Read from the IRS documents linked above on October 17, 2026. General information, not tax advice. Your own facts decide the outcome, and a preparer, the account provider or the IRS is the right place to confirm anything consequential.