What Is Box 13 on a W-2? Statutory, Retirement, Sick Pay

Box 13 on a W-2 is a set of three checkboxes — Statutory Employee, Retirement Plan, and Third-Party Sick Pay — that flag special tax situations to the IRS. Each one changes how your income is taxed or what deductions you can claim, so a single wrong checkmark can cost you money at filing time. None of the boxes has a dollar amount attached; the mark itself is the information.

Statutory Employee

This box is checked when you fall into a narrow group of workers who aren’t traditional employees under common-law rules but are treated as employees for Social Security and Medicare tax purposes. Your employer withheld those payroll taxes from your pay, but you file your income taxes differently than a regular W-2 worker would.

Only four categories of workers qualify under 26 U.S.C. § 3121(d)(3): delivery drivers who distribute food, beverages, or laundry on commission; full-time life insurance salespeople; home workers who use materials supplied by the company they work for; and full-time traveling salespeople who take orders from wholesalers or retailers for a principal.¹ Two extra conditions apply: you must perform the services personally rather than subcontract them, and you can’t have a major investment in the equipment or facilities you use, other than a vehicle.

When the box is correctly checked, your income from that job goes on Schedule C instead of line 1 of Form 1040. That lets you deduct business expenses directly against the income, which lowers what you’re taxed on.² If it should be checked and isn’t, you lose access to those deductions. If it’s checked when it shouldn’t be, you may end up reporting income on the wrong form entirely.

Retirement Plan

A mark in this box tells the IRS you were an “active participant” in an employer-sponsored retirement plan during the tax year. That single checkmark directly controls whether you can deduct contributions to a traditional IRA on your personal return.

You count as an active participant if your employer made any contribution to a defined contribution plan on your behalf, or if you made elective deferrals yourself into a plan like a 401(k), 403(b), SEP, or SIMPLE IRA. For a traditional pension (defined benefit plan), you’re considered an active participant just by being eligible for employer funding, even if you’ll never collect from it.² The threshold is low. A single dollar of employer matching, or one voluntary contribution from you, triggers the designation for the whole year.

What It Does to Your IRA Deduction

When the Retirement Plan box is checked, your ability to deduct traditional IRA contributions phases out based on your modified adjusted gross income. For 2026:

Single filers covered by a workplace plan: deduction phases out between $81,000 and $91,000 of MAGI. Below $81,000 you get the full deduction; above $91,000 you get none.
Married filing jointly, contributing spouse covered: phase-out range is $129,000 to $149,000.
Married filing jointly, contributing spouse not covered but the other spouse is: phase-out range is $242,000 to $252,000.

Those thresholds matter more than most filers realize.³ A wrongly checked box can cause you to skip an IRA deduction you were entitled to. A wrongly unchecked box can let you claim a deduction you’ll owe back with interest after an IRS review.

Cross-Checking With Box 12

You can sanity-check the Retirement Plan mark by looking at Box 12 on the same W-2. Certain letter codes there represent elective deferrals to plans that require the Box 13 indicator: Code D (401(k)), Code E (403(b)), Code F (SEP salary reduction), Code S (SIMPLE IRA), Code AA (Roth 401(k)), and Code BB (Roth 403(b)).⁴

One frequent error involves 457(b) deferred compensation plans, which use Box 12 Code G or Code EE. A 457(b) does not make you an active participant for IRA deduction purposes, so if that’s the only plan your employer offers, the Retirement Plan box should not be checked.⁴ If it is, that error could needlessly limit your IRA deduction.

Third-Party Sick Pay

This box is marked when disability or illness benefits were paid to you by an outside source, usually a commercial insurance carrier, rather than from your employer’s own payroll. It shows up most often when the employer reports the insurance-paid income on the W-2 instead of the insurer issuing a separate form.

The checkbox exists to keep the IRS from double-counting the same dollars if both the employer and the insurer report the income. Marking it signals which party handled the reporting so the numbers reconcile.² For most recipients, the practical effect is limited to making sure you don’t accidentally report the sick pay twice on your return.

If a Box 13 Checkbox Is Wrong

Fixing an error starts with your employer. Contact payroll or human resources and explain which checkbox is incorrect. Bring supporting documentation: retirement account statements if the Retirement Plan box is the problem, or your employment contract if the Statutory Employee designation looks off. Your employer then files Form W-2c with the Social Security Administration and gives you a corrected copy.⁵

If your employer hasn’t responded by the end of February, you can call the IRS at 800-829-1040 and ask a representative to open a W-2 complaint. The IRS will contact the employer directly, which usually speeds things up.⁶

If a corrected form still hasn’t arrived by your filing deadline, use Form 4852 as a substitute W-2. On it, you estimate your wages, withholdings, and the correct Box 13 status, and explain how you arrived at those figures using pay stubs, retirement statements, or similar records.⁷ Filing with Form 4852 is better than filing late, though using estimates can invite additional IRS scrutiny. Once the W-2c arrives, compare it to what you reported. If the numbers differ, amend your return with Form 1040-X.

1
Office of the Law Revision Counsel. 26 USC 3121 – Definitions
2
Internal Revenue Service. General Instructions for Forms W-2 and W-3 (2026)
3
Internal Revenue Service. 401(k) Limit Increases to $24,500 for 2026, IRA Limit Increases to $7,500
4
Internal Revenue Service. Common Errors on Form W-2 Codes for Retirement Plans
5
Internal Revenue Service. About Form W-2 C, Corrected Wage and Tax Statements
6
Internal Revenue Service. W-2 – Additional, Incorrect, Lost, Non-Receipt, Omitted
7
Internal Revenue Service. Form 4852 – Substitute for Form W-2, Wage and Tax Statement