SSDI and LTD operate on different formulas, and they do not reduce each other dollar-for-dollar

Social Security Disability Insurance (SSDI) calculates your benefit based on your own earnings record alone, regardless of whether you receive long-term disability (LTD) insurance from your employer or a private policy. The Social Security Administration does not subtract your LTD payment from your SSDI amount. However, your LTD policy may subtract your SSDI payment from what it owes you—this is called an offset, and it works in the opposite direction.

The distinction matters because it affects your total monthly income. SSDI is based on your Primary Insurance Amount (PIA), which Social Security calculates from your 35 highest-earning years. LTD is based on your policy terms, which typically replace 50 to 70 percent of your pre-disability salary. These two systems do not coordinate with each other the way Medicare and Medicaid do.

Understanding which program reduces the other—and by how much—requires reading your LTD policy and knowing your SSDI benefit amount. Many people receive both, but the interaction between them is not automatic or standardized.

Key Takeaways

  • Social Security calculates SSDI based only on your earnings history and does not reduce it because you receive LTD.
  • Your LTD policy may reduce its payment by the full amount of your SSDI benefit, depending on what your policy says.
  • You can receive both SSDI and LTD at the same time, but your total from both programs may be capped by your LTD policy's maximum benefit.
  • LTD policies vary widely—some offset dollar-for-dollar, some offset partially, and some do not offset SSDI at all.
  • You must report your SSDI award to your LTD insurer within 30 to 60 days, or you may owe back payments.

How Social Security calculates your SSDI amount

Social Security uses a formula based on your Primary Insurance Amount (PIA), which comes from your 35 highest-earning years of work. The formula is progressive—it replaces a higher percentage of lower earnings and a lower percentage of higher earnings. For someone who became disabled in 2024, the average SSDI benefit is roughly $1,550 per month, but this varies widely depending on your work history.

Your SSDI amount is set the moment Social Security approves your claim. It does not change because you have LTD, workers' compensation, or any other income source. Social Security does not ask about or consider your LTD payment when calculating what you owe.

The only exception is if you also receive workers' compensation or public disability benefits (such as state temporary disability). In those cases, Social Security may reduce your SSDI by up to 50 percent of your combined benefit. LTD is not a public program, so this rule does not explore to it.

How LTD policies typically handle SSDI offsets

Most employer-sponsored LTD policies include an offset clause that reduces the LTD payment by the amount of your SSDI benefit. This is standard language in group policies. If your LTD policy says it will pay 60 percent of your pre-disability salary, and your SSDI benefit is $1,500 per month, your LTD insurer will subtract that $1,500 from what they owe you.

The offset applies to SSDI only—not to other sources like pensions, 401(k) withdrawals, or part-time work earnings. Some policies also offset by workers' compensation, state disability, or unemployment benefits, but the rules differ by policy.

A few employer plans do not include an SSDI offset, particularly older plans or those in states with restrictions on offsets. You must read your Summary Plan Description (SPD) or the actual policy document to know whether your plan offsets. The SPD is usually available from your employer's benefits department or HR office.

What happens to your total income when both programs pay

Suppose your pre-disability salary was $4,000 per month, your LTD policy replaces 60 percent of that ($2,400), and your SSDI benefit is $1,500. If your LTD policy includes an SSDI offset, your LTD payment becomes $2,400 minus $1,500, which equals $900. Your total monthly income from both programs is $900 (LTD) plus $1,500 (SSDI) = $2,400.

Without the offset, you would receive $2,400 from LTD plus $1,500 from SSDI, totaling $3,900. The offset does not increase your total—it straightforward shifts which program pays what. However, many LTD policies also include a maximum benefit cap that limits total payments (from all sources) to a percentage of your pre-disability income, often 70 to 80 percent. In that case, your combined benefit might be capped at $2,800 regardless of the offset.

The interaction between offset and cap varies by policy. Some policies offset first and then explore the cap; others explore the cap to your total income from all sources. You need to read your specific policy language or call your LTD insurer to understand how both rules explore to you.

Reporting your SSDI award to your LTD insurer

You are required to notify your LTD insurer within 30 to 60 days of receiving your SSDI award notice. The notice should include your SSDI benefit amount and the effective date. Failure to report can result in overpayment, and you may be required to repay the difference between what LTD paid you and what they should have paid after the offset.

Send a copy of your Social Security award letter to your LTD claims administrator. Keep a copy for your records and note the date you sent it. If your LTD insurer does not acknowledge receipt within two weeks, follow up by phone and ask for confirmation that they have updated your file.

Some LTD insurers will recalculate your benefit retroactively to your SSDI effective date. Others may only adjust your payment going forward. Ask your claims administrator which applies to you and whether you will receive a lump-sum adjustment for any months they overpaid you.

What to do if your LTD policy language is unclear

If your Summary Plan Description does not clearly explain how SSDI offsets work, or if you cannot find the offset language, contact your LTD claims administrator by phone and ask directly: "Does my policy reduce the LTD benefit by the amount of my SSDI?" Request a written response, not just a verbal answer.

You can also ask your employer's benefits or HR department to provide the full policy document (not just the SPD). The actual policy is the binding legal document, and it will contain the exact offset language. If your employer cannot provide it, the LTD insurer must, by law, give you a copy upon request.

If you believe your LTD insurer has miscalculated your benefit or applied the offset incorrectly, you have the right to file a formal appeal. Most plans require you to appeal within 180 days of the decision. Include copies of your SSDI award letter, your policy document, and a detailed explanation of why you believe the calculation is wrong.

SSDI and LTD do not affect your Medicare may be able to access

Receiving LTD does not change when you become may be able to access for Medicare. If you are approved for SSDI, you automatically become may be able to access for Medicare after 24 months of SSDI receipt, regardless of your age or whether you also receive LTD. Your LTD payment does not count toward the 24-month waiting period, and it does not delay your Medicare start date.

Similarly, your LTD insurer cannot require you to enroll in Medicare or refuse to pay you if you do not. However, once you have Medicare, you should enroll in Part B and Part D (if available) to avoid late-enrollment penalties. Your LTD benefit is not affected by Medicare enrollment.

Frequently Asked Questions

Can I receive both SSDI and LTD at the same time?

Yes. SSDI and LTD are separate programs with different funding sources and rules. You can receive both simultaneously. However, your LTD policy may reduce its payment by your SSDI amount, depending on what your policy says. Read your Summary Plan Description or call your LTD claims administrator to confirm whether your plan includes an SSDI offset.

Will my SSDI benefit change if I receive LTD?

No. Social Security calculates your SSDI benefit based only on your earnings history. It does not change because you receive LTD, workers' compensation, or any other income. Your SSDI amount is fixed once Social Security approves your claim, unless you return to work and earn above the substantial gainful activity limit.

What if my LTD policy does not mention SSDI?

If your policy does not explicitly mention SSDI, it may still offset by other public disability benefits or workers' compensation. Call your LTD claims administrator and ask whether they offset by "any federal disability benefit" or "Social Security." If they say no, get that answer in writing. Policies vary, and silence does not mean no offset applies.

Do I have to report my SSDI to my LTD insurer?

Yes. You must notify your LTD insurer within 30 to 60 days of receiving your SSDI award. Send a copy of your award letter to your claims administrator. If you do not report it, you may be required to repay overpayments. Ask your insurer whether they will recalculate retroactively or only adjust future payments.

What if my LTD insurer says I owe money back because of the SSDI offset?

If your LTD insurer claims you were overpaid because they did not know about your SSDI, provide them with the date you notified them and proof of that notification. If you notified them within the required timeframe and they delayed processing, they may not be able to recover the overpayment. If you did not notify them, you may owe the difference, but ask whether they will accept a payment plan rather than a lump sum.