SUB pay for unemployment is a supplemental unemployment benefit: a private, employer-funded payment that tops up your state unemployment check so your income during a layoff comes closer to what you used to earn. The payments arrive on a recurring schedule, usually matching your state benefit cycle, and the amount is calculated to fill part or all of the gap between your state check and your former weekly pay. When the employer’s plan meets IRS design rules, those payments are not subject to Social Security, Medicare, or federal unemployment tax, though federal income tax still applies.
How SUB Pay Is Different From Severance
Severance is usually a lump sum or a short run of payments based on years of service, and you get it whether or not you file for unemployment. SUB pay works the opposite way. It only pays out while you are actually collecting state unemployment insurance, the dollar amount is pegged to the difference between that state check and your prior wages, and it cannot be paid as a lump sum.
That structure is what unlocks the tax treatment. The Supreme Court held in 2014 that severance counts as wages for FICA purposes, so it carries the full payroll tax load.1Justia Law. United States v. Quality Stores, Inc., 572 U.S. 141 (2014) SUB pay can sit outside that rule, but only when the plan is built to specification. Calling a severance package “SUB pay” without changing how it is paid does not change the tax result.
Who Qualifies for SUB Pay
The Internal Revenue Code defines these benefits as payments made because of an involuntary separation from a reduction in force, a plant or operation shutdown, or similar conditions.2Office of the Law Revision Counsel. 26 U.S. Code 3402 – Income Tax Collected at Source Workers who quit voluntarily or are fired for cause do not qualify. Individual plans then layer their own conditions on top, which might include minimum tenure, full-time status, or participation in a job search program.
The ongoing eligibility rule that matters most: you must be receiving state unemployment insurance to receive SUB pay. If the state disqualifies you for any reason, the SUB payments stop with it. Common reasons include refusing a suitable job offer, not conducting an active job search, or missing a scheduled appointment with the state unemployment office. New employment ends both streams at once, because the plan exists to bridge unemployment, not to reward past service.
How SUB Pay Works With Your State Unemployment Check
Most states treat properly structured SUB payments as separate from wages when they calculate your weekly unemployment benefit. Because the payments are not remuneration for services, receiving them generally does not reduce your state check. You collect both, and the combined total pushes you back toward your former take-home pay. That dual-receipt feature is the point of the plan.
States are not uniform, though. Some state labor departments look closely at the plan documents to confirm the payments really function as a supplement rather than disguised wages. If a state agency decides the payments look like wages, it can offset them against your state benefit dollar for dollar, and the arrangement loses its value. If you are unsure how your state treats a specific plan, ask the state unemployment office or check the plan summary the employer provides.
Taxes on SUB Pay
What You Save
When the plan qualifies, SUB payments are excluded from wages for Social Security tax (6.2%), Medicare tax (1.45%), and federal unemployment tax.3Internal Revenue Service. 2026 Publication 15-A, Employer’s Supplemental Tax Guide For you, that means roughly 7.65% more of each payment stays in your pocket compared to the same dollar amount paid as regular wages. The employer also skips its matching 6.2% and 1.45% shares and its FUTA obligation, which is usually why the plan exists.
What You Still Owe
Federal income tax still applies. The Internal Revenue Code treats SUB payments as if they were wages for withholding.2Office of the Law Revision Counsel. 26 U.S. Code 3402 – Income Tax Collected at Source Because SUB pay is classified as supplemental wages, your employer can withhold at the 22% flat rate rather than using your W-4 allowances.4Internal Revenue Service. 2026 Publication 15-T, Federal Income Tax Withholding Methods If your actual tax bracket is lower or higher than 22%, expect to reconcile the difference when you file.
State income tax rules vary. Check with your state revenue department for how it handles supplemental wages.
How SUB Pay Shows Up on Your W-2
Employers report SUB payments in Box 1 of Form W-2 alongside regular wages.5Internal Revenue Service. General Instructions for Forms W-2 and W-3 (2026) Because the payments are excluded from Social Security and Medicare wages when the plan qualifies, the amounts in Boxes 3 and 5 should not include the SUB pay.
A quick check if you received both regular wages and SUB pay in the same year: Box 1 should be higher than Boxes 3 and 5 by roughly the SUB total. If the numbers do not line up that way, either FICA taxes were withheld that should not have been, or the plan did not actually qualify for the exclusion. Either situation is worth raising with the payroll department.
You report the Box 1 figure on your federal return as ordinary income. There is no special line or schedule for SUB pay. It flows onto your return the same way wages do.
What Happens When Your State Benefits Run Out
State unemployment benefits typically last 26 weeks, and some states offer fewer. Once you exhaust your state benefits, any SUB payments made after that point lose their tax-favored status and become wages subject to FICA.6Internal Revenue Service. IRS Memorandum The plan is not required to stop paying, but Social Security and Medicare withholding starts on those post-exhaustion checks, and the employer owes its share too.
Most well-designed plans cap benefits at the same duration as your state eligibility to avoid this problem. If yours keeps paying past that point, your net check will shrink when FICA withholding kicks in, and your W-2 will reflect the change in Boxes 3 and 5. The tax-favored portion of the plan simply has a shelf life tied to your state benefit weeks.