W-2 Box 13 — Statutory employee · Retirement plan · Third-party sick pay

What Box 13 means

Statutory employee means you're a common-law independent contractor whom Congress decided to treat as an employee for Social Security and Medicare purposes only — not for income tax reporting. IRC §3121(d)(3) limits this to four narrow categories: certain agent- or commission-drivers distributing food, beverages, laundry, or dry cleaning; full-time life insurance sales agents; home workers who perform work to your specifications on materials you furnish; and full-time traveling or city salespeople who sell on your behalf to wholesalers, retailers, or similar businesses. If this box is checked, your Box 1 wages go on Schedule C, Line 1, instead of Form 1040, Line 1a — letting you deduct related business expenses the way a self-employed person would.

Retirement plan means you were an 'active participant' in an employer-sponsored pension, profit-sharing, 401(k), SEP, or SIMPLE plan for any part of the year — even a single day of coverage triggers the box, regardless of whether you actually contributed. IRS Publication 590-A treats this box as the official record of your active-participant status and directs you to check it to determine whether the traditional IRA deduction phase-out under IRC §219(g) applies to you. If your spouse is covered but you are not, you still get a phase-out range — a much higher one than an active participant gets — rather than losing the deduction outright.

Third-party sick pay means some or all of your wages were disability or sick pay paid by an insurance company rather than your employer directly. Depending on the arrangement, either the insurer issues its own W-2 for that pay, or it reports the amounts back to your employer to include on your regular W-2 with this box checked. Federal income tax withholding on third-party sick pay is voluntary when the payer isn't acting as your employer's agent — you have to file Form W-4S with the payer to have anything withheld — so it's common to owe federal tax on this income even though it arrives on a W-2 that looks like an ordinary paycheck.

The three boxes are independent of each other and of everything else on the form — a statutory employee can also be an active retirement plan participant, and a third-party sick pay recipient can have either of the other two boxes checked as well. Because each box routes to a different form with a different tax consequence, confirm with HR or your plan administrator which boxes should legitimately apply to you rather than assuming a checked box is a payroll error.

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