You can collect LTD and SSDI at the same time, and most people who qualify for one qualify for the other. What almost no one realizes going in is that your Long-Term Disability insurer will subtract your Social Security Disability Insurance payment from your LTD check, dollar for dollar. So collecting both usually keeps your total monthly income the same rather than doubling it. The real value of stacking the two benefits shows up elsewhere: Medicare eligibility, protection if your LTD claim is later terminated, and a stable income floor backed by federal law rather than a private contract.
The Offset Is Where the Money Goes
Nearly every LTD policy contains an offset clause. If your policy pays $3,000 a month and SSDI approves you for $1,200, your LTD check drops to $1,800. Total disability income: still $3,000.
The offset exists because LTD policies are written to replace a set percentage of your pre-disability income, not to stack on top of other benefits. That is also why your LTD insurer will push hard for you to file for SSDI as quickly as possible. Every dollar SSDI pays you is a dollar the insurer doesn’t have to.
Family Benefits May Get Swept In Too
When SSDI approves your claim, your spouse and minor children may qualify for auxiliary benefits based on your work record. Many LTD policies offset those payments as well, subtracting them from your LTD check even though the money is paid to your family members rather than to you. Some policies only offset benefits paid directly to you. Others reach every dollar Social Security pays because of your disability. The offset language in your policy is worth reading closely on this point.
What Happens to the SSDI Cost-of-Living Increase
SSDI benefits receive an annual cost-of-living adjustment; for 2026 it is 2.8%.1Social Security Administration. Social Security Announces 2.8 Percent Benefit Increase for 2026 Whether you actually keep that raise depends on your policy. Some LTD policies freeze the offset at your original SSDI amount, letting future COLA increases flow to you as extra income. Others recalculate the offset every year, so each SSDI raise just shrinks your LTD payment by the same amount. Over a multi-year claim, that difference can run into the thousands.
Why the Insurer Requires You to File for SSDI
Most LTD policies require you to apply for SSDI as a condition of continuing benefits. This isn’t a suggestion. If you refuse or delay, the insurer can reduce or suspend your LTD payments. Some policies apply an “estimated SSDI offset,” deducting what the insurer thinks Social Security would pay you even if you haven’t filed yet. That phantom offset gives you a strong reason to file promptly.
Because your SSDI approval directly saves the insurer money, many will offer help with the application, including referrals to disability attorneys. The help is real, but the referral serves the insurer’s interest in getting SSDI approved quickly. You are not obligated to use their recommended representative.
An SSDI denial does not automatically end your LTD benefits. The two programs use different definitions of disability, and it is possible to qualify under your policy while failing the SSA’s stricter standard. A denial can, however, prompt the insurer to scrutinize your claim more aggressively, so appealing the SSDI decision matters.
The Retroactive SSDI Check and What You Owe Back
SSDI applications often take months or years to approve. During that time your LTD insurer has been paying the full benefit with no offset. Once SSDI approves you, the SSA issues a lump-sum back payment covering the months since your disability onset, minus a five-month waiting period.
Your insurer will want most of that lump sum. The logic: for every month SSDI covered retroactively, the insurer overpaid you by the SSDI amount. Most insurers require you to sign a reimbursement agreement before LTD payments even start, obligating you to return the overlapping portion of the back pay, typically within 30 days of receiving it. Miss the repayment and the insurer can suspend your LTD benefits until the overpayment is recovered, or sue on the reimbursement agreement as a contract.
One calculation detail matters. Most SSDI attorneys work on contingency, and their fee is capped at the lesser of 25% of your past-due benefits or a maximum set by the Commissioner, currently $9,200.2Social Security Administration. Fee Agreements – Representing SSA Claimants That fee comes out of your back pay before you receive it. Your insurer’s overpayment reclaim should be based on the net you actually received, not the gross award. If SSDI paid $18,000 in back pay and $4,500 went to your attorney, the insurer’s maximum reimbursement should be calculated from $13,500. Verify the math yourself. Errors consistently favor the insurer.
The Five-Month SSDI Waiting Period
Even after the SSA finds you disabled, SSDI benefits do not start immediately. Federal law imposes a five-month waiting period from your disability onset date, with your first payment arriving in the sixth full month.3Social Security Administration. Approval Process – Disability Benefits The waiting period is written into the statute itself.4Office of the Law Revision Counsel. 42 USC 423 – Disability Insurance Benefit Payments Disability from ALS is the one exception; the waiting period is waived.
For most people collecting both benefits, LTD covers this gap. During those first five months there is no SSDI to offset, so the insurer pays the full LTD benefit. The offset kicks in only when SSDI payments actually begin.
The 24-Month Definition Change in Your LTD Policy
More LTD claims end here than at any other point, and it directly affects how long you will be collecting both benefits. Most employer-sponsored LTD policies define disability as the inability to perform your own occupation for the first 24 months. After that, the definition switches to the inability to perform any occupation for which you are reasonably qualified by education, training, or experience. A surgeon who cannot operate but could teach can lose LTD benefits at that mark under the broader standard.
Some policies make the switch at 12 months, others at 36 or 48, but 24 is by far the most common. If you are approaching the transition, expect the insurer to re-evaluate. Updated medical evidence and, when appropriate, a vocational assessment showing you cannot perform other work becomes critical well before the definition changes. SSDI, by contrast, continues on its own standard regardless of what your LTD policy says, which is one reason having both benefits matters: if LTD terminates at the definition change, SSDI does not disappear with it.
Medicare Kicks In After 24 Months of SSDI
SSDI comes with something LTD does not: automatic Medicare eligibility. After 24 months of receiving SSDI benefits, you qualify for Medicare regardless of your age.5Social Security Administration. Medicare Information For anyone whose employer health coverage ended when they stopped working, or whose COBRA has run out, this is often the most valuable part of collecting SSDI.
The 24-month clock starts from your first month of SSDI entitlement, not from when you filed or were approved. Previous periods of disability may count toward the requirement. And if you later attempt to return to work, Medicare continues for at least 93 months after your trial work period ends, provided you still have a disabling condition.5Social Security Administration. Medicare Information
How Taxes Work When You Have Both
LTD and SSDI follow different tax rules, and together they can produce a larger tax bill than people expect.
For LTD, taxability depends on who paid the premiums. If your employer paid with pre-tax dollars, the most common setup, your LTD benefits are taxable. If you paid premiums yourself with after-tax money, the benefits are tax-free. Some employers deliberately structure premiums as after-tax deductions so future benefits will not be taxed. Your pay stubs or HR department can confirm which arrangement applies.
For SSDI, federal tax depends on your combined income: half your annual Social Security benefit, plus other taxable income, plus tax-exempt interest. Above $25,000 for a single filer or $32,000 for married couples filing jointly, up to 50% of your SSDI becomes taxable. Above $34,000 single or $44,000 joint, up to 85% is taxable.6Internal Revenue Service. Social Security and Equivalent Railroad Retirement Benefits Below the lower threshold, none of your SSDI is taxed.
A retroactive SSDI lump sum can be especially rough, since it may push your combined income into a higher taxability bracket for the year you receive it. The IRS allows you to calculate the tax on lump-sum back payments using either the current year or the year the payment should have been received. IRS Publication 915 walks through both methods.6Internal Revenue Service. Social Security and Equivalent Railroad Retirement Benefits
If Your LTD Claim Is Denied: The ERISA Deadline
If your LTD coverage came through your employer, it is almost certainly governed by the Employee Retirement Income Security Act. Under federal law, the plan must give you written notice of any denial with reasons explained clearly enough for you to understand.7Office of the Law Revision Counsel. 29 U.S. Code 1133 – Claims Procedure
You generally have 180 days from the denial date to file an internal appeal. Miss that window and you lose the right to appeal. Without completing the internal appeal, a court will almost certainly dismiss any lawsuit you try to file afterward. The internal appeal is the only door into the courthouse.
The other trap: the administrative record is typically closed after the appeal. Whatever medical evidence, vocational assessments, and supporting documents you submit during the appeal are usually all a court can consider if you later sue. Treat the appeal as your trial. Submit updated doctor’s opinions, test results, and evidence that you cannot perform the work the insurer claims you can.
Individually purchased LTD policies generally are not governed by ERISA. They fall under state insurance law, which often gives claimants more flexibility in court. A disability attorney can confirm which set of rules applies to your policy based on how you obtained the coverage.