Long-Term Disability Insurance and Section 125: Why the Tax Picture Changes Mid-Claim

• IRC Section 105(a) makes an LTD benefit taxable whenever the premium was employer-paid or paid pre-tax, and tax-free only when the employee paid with after-tax dollars.
• IRC Section 3121(a)(4) excludes disability payments from FICA wages after six calendar months following the employee's last month of work, so a multi-year LTD claim is FICA-taxable for only a fraction of its length.
• Most group LTD policies reduce the monthly benefit dollar-for-dollar by any SSDI award for the same disability, per the policy's own integration clause.
• Bureau of Labor Statistics data from March 2025 shows only 21% of workers at establishments under 50 employees have access to employer-sponsored LTD coverage, versus 64% at establishments of 500 or more.
• Form 8922 reconciles which party, insurer or employer, withheld FICA on the benefit, and a single long-term claim can require that reconciliation across more than one filing year.

A 60-employee accounting firm in Richmond, Virginia pre-taxed its long-term disability premium through its Section 125 plan for a decade without a single claim. Then a senior associate was diagnosed with a condition that kept her out of work for three years, and payroll discovered the mechanics were nothing like short-term disability. The first six months of her benefit check came out of gross pay with full Social Security and Medicare tax on top of income tax withholding, exactly as expected. Every month after that, the FICA line item simply disappeared from the pay stub, while the income tax withholding never stopped, for two and a half more years. Here is why a long-term disability claim's tax treatment changes shape partway through, why that matters far more than it does for a short-term claim, and how an employer sets up the plan document and the enrollment conversation so nobody on payroll has to figure this out for the first time during an actual claim.

Is long-term disability insurance taxable?

Long-term disability benefits are taxable to the employee to the extent the premium behind that coverage was paid by the employer, or by the employee with pre-tax dollars, under Internal Revenue Code Section 105(a). The rule looks at who bore the economic cost of the premium, not at how the policy was marketed at open enrollment. A benefit check funded by a premium the employee never paid income tax on is itself taxable income when it arrives, whether the claim lasts six weeks or six years. Only a premium paid with genuine after-tax dollars, outside any pre-tax salary reduction, produces a benefit that stays free of federal income tax.

How does Section 125 affect LTD benefit taxation?

Running a long-term disability premium through a Section 125 cafeteria plan makes the future benefit fully taxable, the same result a pre-tax election produces for short-term disability→. The IRS treats a Section 125 salary reduction as an employer-paid premium under IRC Section 105(a), because the employee's premium dollar skipped both income tax and FICA tax on the way in. That tradeoff carries more weight for LTD than STD purely because of duration. A short-term claim usually resolves within weeks. A long-term disability claim can pay out for two years, five years, or until the employee reaches a policy-defined age, and every one of those monthly checks is taxable income for as long as the pre-tax premium funded the coverage.

Why does the six-month FICA rule matter more for LTD than STD?

Internal Revenue Code Section 3121(a)(4) excludes disability payments from FICA wages after the expiration of six calendar months following the last calendar month the employee actually worked, regardless of who funded the premium. This rule applies to short-term and long-term disability alike, but the practical effect is completely different depending on how long the claim runs. A short-term claim that resolves in eight or twelve weeks never leaves the six-month FICA window, so Social Security and Medicare tax applies to the entire benefit period. A long-term claim that pays out for two or three years is subject to FICA tax for only the first six months of that span. Every payment after that point still owes federal income tax if the premium was pre-tax, but it owes zero FICA tax, on either the employee or employer side.

How this differs from short-term disability's FICA timeline

A short-term disability claim and a long-term disability claim start under the identical rule, but a long claim eventually runs past the six-month mark while most short claims never do. That means the employer's own FICA cost on an LTD claim, 7.65% on top of whatever the plan pays out, is largely a first-six-months problem rather than a whole-of-claim problem. An employer that budgets LTD claim costs as if FICA applies for the full duration is overstating the employer-side tax exposure on any claim that runs past six months, which is most genuinely long-term claims by definition.

We built our claims reserve assuming payroll tax applied the whole time, the way it does for our short-term disability claims. Finding out the FICA line item stops after six months, while the income tax withholding never does, meant we had been overestimating the employer cost side for years.

How does the SSDI offset change an LTD benefit check?

Most group long-term disability policies reduce the monthly LTD benefit dollar-for-dollar by any Social Security Disability Insurance award the employee receives for the same disability, under the policy's own integration clause rather than under tax law. An employee approved for $1,200 a month in SSDI under a policy that pays $4,250 a month in gross LTD benefits collects a combined $4,250, not $5,450, with the insurer covering only the $3,050 difference. The SSDI offset does not change how the LTD portion is taxed. It changes which party pays which piece and how each piece gets reported. The insurer's portion still follows the pre-tax versus after-tax rule under IRC Section 105(a). The SSDI portion is a separate federal benefit, and up to 85% of Social Security disability benefits can be taxable depending on the employee's combined income, under the rules in IRS Publication 915.

What is "own occupation" vs. "any occupation" coverage?

Most group long-term disability policies use one definition of disability for the first 24 months of a claim and a stricter one after that, a plan-design detail rather than a tax rule, but one that directly affects how long an employee keeps receiving the benefit HR described at enrollment. During the initial period, most policies pay benefits under an "own occupation" standard, meaning the employee qualifies if they cannot perform the material duties of their specific job, even if they could work in a different field entirely. After that period, most policies switch to an "any occupation" standard, under which the employee must be unable to perform any job reasonably suited to their education, training, and experience to keep collecting benefits. The 24-month switch is unrelated to the six-month FICA cutoff described above, and it is a common point where an employee loses a benefit they assumed was permanent, which is why the distinction belongs in the enrollment conversation, not just the plan document.

How common is employer-sponsored LTD coverage at a small business?

Access to employer-sponsored long-term disability coverage rises sharply with employer size. The Bureau of Labor Statistics National Compensation Survey, released September 25, 2025 with March 2025 reference data, found that 21% of private industry workers at establishments with fewer than 50 employees had access to long-term disability coverage, compared with 64% at establishments of 500 or more employees, a wider gap than the survey found for short-term disability access over the same size bands. A small or midsize employer that offers LTD coverage at all, and structures it correctly inside a Section 125 plan, is offering a benefit most of its size peers do not, which is worth stating plainly in recruiting and retention conversations rather than treating LTD as a minor line item on the benefits menu.

Does Form 8922 apply to long-term disability benefits?

Yes, the same way it applies to short-term disability. Form 8922, Third-Party Sick Pay Recap, reconciles the wages and taxes reported on Form W-2 with what a third-party insurer actually withheld and remitted whenever that insurer pays the benefit directly and FICA liability is transferred between the employer and the insurer. Because a long-term disability claim can span more than one calendar year, an employer may need to coordinate Form 8922 reporting with its insurer across multiple filing cycles for a single, ongoing claim, which is not usually an issue for a short-term claim that resolves inside one plan year. Employers should confirm with their carrier or third-party administrator which entity files Form 8922 for every year a long-term claim stays open.

How should an employer structure LTD premiums in a Section 125 plan?

An employer does not need to pull LTD out of the Section 125 plan to get this right, since the pre-tax option is legitimate and still produces a real, if modest, FICA savings on the premium itself. The fix is disclosure and documentation. Employers should confirm in writing with the carrier who withholds and deposits FICA during the six-month window, communicate the realistic tax picture across a full claim, not just the first paycheck, and revisit the funding structure and the own-occupation deadline at every renewal, since a carrier change can quietly shift either one without anyone updating what employees are told at enrollment.

1. Confirm the current premium funding source. Pull the plan document and payroll deduction codes to verify whether LTD premiums are employer-paid, pre-tax, or after-tax today.
2. Offer the annual pre-tax versus after-tax election. Structure it prospectively under Revenue Ruling 2004-55, locked before the plan year starts.
3. Get FICA withholding responsibility in writing. Confirm with the insurer whether the carrier or the employer withholds and deposits FICA during the first six months under IRC Section 3121(a)(4).
4. Document how the SSDI offset is calculated. Confirm the policy's integration clause and make sure payroll understands the insurer's payment, not the combined benefit, is what gets reported and withheld.
5. File Form 8922 for every year a claim stays open. A multi-year LTD claim can require this reconciliation more than once.
6. Show employees the full-claim tax picture, not just month one. Communicate that FICA stops after six months but income tax withholding does not, and that "own occupation" coverage can change to "any occupation" at month 24.

Worked example: FICA cost over a full claim

A 60-employee accounting firm offers a 60%-of-salary LTD benefit funded through pre-tax payroll deduction. A senior associate earning $85,000 a year, or $7,083.33 gross per month, is approved for a claim that runs 36 months and receives 60% of that figure, or $4,250 gross per month. Because the premium was pre-tax, that $4,250 is fully subject to federal income tax withholding for the entire 36-month claim. FICA tax applies only to the first six months of payments under IRC Section 3121(a)(4), then stops completely for the remaining 30 months, even though the benefit keeps paying out and income tax withholding continues unchanged.