Making Sense of Your
"Date Last Insured"
An applicant’s Date Last Insured (DLI) is a key factor in determining eligibility for Social Security Disability Insurance (SSDI). While you are working, you pay Social Security (FICA) taxes, which act like premiums and provide coverage for disability benefits through the Social Security Administration.
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If a worker later becomes disabled and can no longer work, they may apply for SSDI and potentially receive monthly cash benefits. However, SSDI coverage does not last forever once someone stops working. Instead, eligibility continues for only a limited period of time—typically a few years—after work activity ends.
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The Date Last Insured is the date when that disability coverage expires. To qualify for SSDI, you must prove that you became disabled on or before your Date Last Insured.
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Still confused? Keep reading below for examples and further explanation.
Calculating Your Date Last Insured
The SSA calculates the date last insured for applicants based on the date they stop working and the number of work credits they have. To estimate their date last insured for themselves, applicants may count back 20 quarters from when they last worked and then count forward 40 quarters from that date. The date they land upon is their estimated date last insured; however, they will receive official notice of the date their benefit eligibility ends from Social Security.
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Earning Enough Work Credits
Applicants for SSDI must have worked recently enough and long enough to qualify for benefits. Based on total wages or self-employment income, workers earn up to four credits per year for coverage. The amount needed to earn a work credit changes each year. For 2026, a worker earns one work credit for approximately every $1,510 in earnings. After earning about $6,040 in covered wages, a worker will reach the maximum of four credits for the year.
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The number of work credits required to qualify for SSDI depends on the applicant’s age at the time of disability. With few exceptions, most applicants need a total of 40 work credits to be eligible for SSDI. Of those 40 credits, at least 20 usually must have been earned within the 10 years immediately before the onset of disability.
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Establishing the Disability Onset Date
To determine applicants’ established onset date, Social Security seeks to identify when claimants first met the medical and non-medical requirements to qualify for disability. When applying for SSDI benefits, applicants must provide the date on which they became disabled. Based on a review of their submitted medical evidence, the SSA decides whether it agrees with the alleged onset date as the correct date for the onset of applicants’ disabilities. The dates Social Security determines as the onset dates for applicants’ conditions is called the established onset date. For some, the SSA may determine the established onset dates fall on the same day as their alleged onset dates. In other cases, Social Security may determine the established onset dates to be before or after the dates that applicants claim to have suffered a disability. For instance, the SSA may establish a later onset date for applicants who return to work for a period after suffering a disability and applying for benefits.
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In relation to the date last insured, the established onset date may significantly affect applicants’ eligibility for SSDI benefits. Should the SSA give applicants an established onset date after their dates last insured, their eligibility may have terminated and, as a result, they may not qualify for the benefits they need.
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Qualifying for Social Security Disability Benefits and the Date Last Insured
In addition to evaluating an applicant’s medical conditions and limitations, Social Security also looks closely at work history, the date last worked, and when the disability began. To qualify for SSDI, an applicant must prove that their disability began on or before their Date Last Insured (DLI).
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For example, if an applicant stopped working in January 2024 due to a serious injury and Social Security determines their Date Last Insured is January 31, 2026, the applicant may still qualify for SSDI—even if they apply after that date—as long as the evidence shows the disability began before the DLI (i.e. January 2024).
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However, if an applicant’s disability begins after their Date Last Insured, SSDI benefits may be denied, even if the condition is severe. In short, SSDI eligibility depends not only on medical severity, but also on timing—the disability must occur while the applicant is still insured.