Non-Taxable Sick Pay on W-2: Box 12, FICA, and Filing

Non-taxable sick pay on a W-2 shows up in Box 12 with Code J. It represents third-party sick pay or disability benefits that are excluded from your taxable income because you personally paid the insurance premiums with after-tax dollars. The amount is already left out of Box 1 wages, so it won’t raise your tax bill, but the IRS still requires it to be disclosed on the form so the numbers reconcile.

Why Some Sick Pay Is Non-Taxable

The rule turns almost entirely on who paid for the underlying insurance. If you paid the premiums yourself with after-tax money, the benefits are generally excluded from gross income under Section 104(a)(3) of the Internal Revenue Code.¹ You already paid tax on the dollars that bought the coverage, so the benefits are treated as a return on that investment.

If your employer paid the premiums, the benefits you receive are taxable and belong in Box 1 with the rest of your wages. When you and your employer split the cost, only the share of benefits tied to your employer’s contribution is taxable; the portion tied to your after-tax contributions stays non-taxable.²

Sick pay your employer hands you directly from its own payroll, rather than through an insurance policy, is always fully taxable and treated like regular wages.

Where Non-Taxable Sick Pay Appears on Your W-2

If your sick pay qualifies as non-taxable, your W-2 handles it in a specific way across several boxes.

Box 1 (Wages, tips, other compensation). The non-taxable sick pay is excluded. Your Box 1 total reflects only actual taxable wages.
Box 3 (Social Security wages) and Box 5 (Medicare wages). Non-taxable sick pay received after the six-month FICA window has closed is also excluded here. Payments received during that six-month window still appear because FICA applied at the time.
Box 12, Code J. The full amount of non-taxable sick pay is reported here. Code J identifies sick pay from a third-party plan that isn’t includible in income because the employee contributed to the plan’s cost.³
Box 13 (Third-party sick pay checkbox). This box is checked when a third-party payer files a W-2 for an insured employee, or when an employer reports sick pay payments made by a third party.³

The Code J figure explains why Box 1 is lower than the total payments you received during the year. You don’t owe tax on the money, but it still has to be disclosed so the reporting reconciles.

The Cafeteria Plan Trap

This is where employees are most often surprised. If your disability insurance premiums are paid through a Section 125 cafeteria plan on a pre-tax basis, the IRS treats those premiums as if your employer paid them, even though the money came out of your paycheck. Benefits under that policy are then fully taxable, and Code J won’t appear.²

To keep non-taxable status, you have to irrevocably elect before the start of the plan year to include the disability premiums in your taxable income, meaning you pay them with after-tax dollars. The election locks in for the full plan year and can only be changed before the next plan year begins. If you become eligible mid-year, the election can be made prospectively for the rest of that year. The same rules apply to both short-term and long-term disability coverage.

The difference between checking “pre-tax” and “after-tax” on a single line during open enrollment can decide whether thousands of dollars in future disability benefits pass through tax-free or arrive as taxable wages.

Why FICA May Still Apply to Non-Taxable Sick Pay

Non-taxable for income tax purposes doesn’t automatically mean non-taxable for Social Security and Medicare. Third-party sick pay stays subject to FICA taxes for the first six calendar months after the last calendar month in which you worked.⁴ Only after that six-month window closes do the payments become exempt from FICA and Federal Unemployment Tax.

The IRS counts full calendar months, not days. If your last day of work was December 5, 2025, your last calendar month of work was December 2025. The six months run January through June 2026, so any sick pay you receive after June 30, 2026, is free of Social Security, Medicare, and FUTA.⁵

One detail catches people off guard. If you return to work for even a single day during your absence, the six-month clock resets based on the new last month you worked. The IRS’s own example: work one day on February 6, 2026, and the new last month becomes February, so FICA exemption doesn’t start until after August 31, 2026.⁵

That’s why your W-2 can show Code J non-taxable sick pay while Boxes 3 and 5 still include some of it. Payments made inside the six-month window count as Social Security and Medicare wages; payments after it don’t.

What to Do on Your Tax Return

Non-taxable sick pay reported with Code J is already excluded from Box 1, so you don’t subtract it again or report it separately on Form 1040. Your Box 1 wages flow to the wages line as usual, and the Code J amount is informational.⁶

Taxable sick pay works the opposite way. It’s already included in Box 1 and flows through with the rest of your wages. If your employer paid the premiums, the full benefit sits on the wages line alongside your salary.²

Keep your third-party payer statements next to your W-2. If your W-2 doesn’t match the payments you actually received, or Code J is missing when you believe your sick pay should be non-taxable, contact your employer or the third-party payer before filing.

Fixing a W-2 That Reports Sick Pay Incorrectly

If non-taxable sick pay ended up in Box 1, or Code J is missing, your employer or the third-party payer needs to file a corrected Form W-2c along with a transmittal Form W-3c. The IRS and Social Security Administration instruct filers to issue corrections as soon as possible after discovering the mistake and to give you a copy promptly.⁷

Don’t file using numbers you know are wrong. If you can’t get a corrected W-2 before the filing deadline, you can file using the correct figures and attach a statement explaining the discrepancy, though getting the W-2c issued protects your Social Security earnings record downstream.

State Paid Family and Medical Leave in 2026

State-run paid family and medical leave benefits sit outside the standard Code J picture and are worth flagging because searchers often lump them together. The IRS concluded in Revenue Ruling 2025-4 that the portion of state medical leave benefits tied to employer contributions counts as gross income and is treated as third-party sick pay for federal tax purposes.⁸

The IRS then extended a transition period through all of calendar year 2026 for the employer-contribution portion of these benefits. During the transition, states and employers aren’t required to follow the income tax withholding and reporting rules that normally apply to third-party sick pay, and no penalties apply for not doing so.⁸ Your 2026 W-2 may not reflect these state-program payments at all, even if they’re technically taxable. The relief doesn’t extend to amounts an employer voluntarily picks up on your behalf for your share of the state contribution; those still get reported as wages.

Some state programs report benefits on Form 1099-G rather than a W-2. California’s Family Temporary Disability Insurance payments, for example, are reported as unemployment compensation in Box 1 of Form 1099-G.⁹ Check both your W-2s and any 1099-G forms you receive to see the full picture of your sick pay and leave income for the year.

1
Office of the Law Revision Counsel. 26 U.S. Code 104 – Compensation for Injuries or Sickness
2
Internal Revenue Service. Life Insurance and Disability Insurance Proceeds
3
Internal Revenue Service. 2026 General Instructions for Forms W-2 and W-3
4
Internal Revenue Service. Publication 15-A, Employer’s Supplemental Tax Guide
5
Internal Revenue Service. Publication 15-A, Employer’s Supplemental Tax Guide
6
Internal Revenue Service. About Form 1040, U.S. Individual Income Tax Return
7
Social Security Administration. Helpful Hints to Forms W-2c/W-3c Filing
8
Internal Revenue Service. Extension of Transition Period to Calendar Year 2026 for Certain Requirements in Revenue Ruling 2025-4
9
Internal Revenue Service. Instructions for Form 1099-G