Your date last insured, or DLI, is the last day you count as “insured” under Social Security based on your work history. It matters most for Social Security Disability Insurance: if your disabling condition began even one day after your DLI, the claim is denied no matter how long you worked before. Your DLI is personal to you, calculated from your own earnings record, and it moves forward every time you earn new credits and can slide backward once you stop working.
How Credits Build Your Insured Status
Social Security coverage runs on credits, sometimes called quarters of coverage. You earn them by working and paying Social Security taxes. In 2026, one credit equals $1,890 in covered earnings, capped at four credits a year, so earning $7,560 or more in 2026 gives you the full four.1Social Security Administration. Quarter of Coverage You don’t need to work across all four calendar quarters. Earn enough in January and all four count for the year.
Credits do two jobs. They decide whether you are “fully insured” for retirement, survivor, and certain disability benefits, and they decide whether you pass the recent-work test for disability coverage. Once earned, credits never expire. But your insured status for disability can lapse if you stop working long enough that your recent credits fall out of the counting window.
How Your DLI Is Calculated
Social Security works backward from the most recent quarter, checking each one until it finds the last quarter where you still meet the insured-status tests. The final day of that quarter is your DLI.2Social Security Administration. RS 00301.148 – Date Last Insured (DLI)
For most workers age 31 or older, the controlling test is the 20/40 rule. You need at least 20 credits within the 40-quarter (10-year) window ending with the quarter being tested, and you also have to be fully insured. Workers under 31 use a different formula based on the years since they turned 21, and workers who are statutorily blind are tested only on fully insured status.
In practical terms, if you stop working entirely, your DLI usually falls about five years after your last year of four-credit earnings. The 10-year window keeps sliding forward, and old work years eventually slide out the back. The first quarter where you fall below 20 credits inside that window is the quarter after your DLI.
Why DLI Matters for Disability Claims
To qualify for SSDI, you have to prove your disability began on or before your DLI. If the medical onset came after, the claim fails. This is where a lot of work-history denials come from. People assume a long career keeps them covered, then discover that years away from work quietly pushed their DLI into the past.3Social Security Administration. DI 25501.320 – Date Last Insured and the Established Onset Date
Two work-history tests sit behind the DLI, and both have to be satisfied for the quarter of onset.
The Recent Work Test
This test checks whether you worked recently enough before the disability began. The rules shift by age at onset:
- Under age 24: at least 6 credits in the three-year period ending when the disability started.
- Ages 24 through 30: credits for at least half the time between age 21 and onset. Someone disabled at 27, for example, needs three years of work (12 credits) in the six years since turning 21.
- Age 31 or older: at least 20 credits in the 10 years before onset, the 20/40 rule.
These are the same tests Social Security uses to set your DLI, so the two ideas are linked. A quarter you can’t pass the recent-work test for is a quarter past your DLI.4Social Security Administration. Social Security Credits and Benefit Eligibility
The Duration of Work Test
You also need enough total lifetime credits, and the requirement grows with age at onset. It ranges from about 1.5 years of work if you become disabled before age 28 up to 9.5 years at age 60. No one ever needs more than 10 years (40 credits) to meet the duration test.4Social Security Administration. Social Security Credits and Benefit Eligibility
Special Rule if You Are Statutorily Blind
If you meet Social Security’s definition of legal blindness, the DLI rules are much more forgiving. The 20/40 recent-work test does not apply. Your DLI turns only on whether you are fully insured, meaning you have enough total lifetime credits.2Social Security Administration. RS 00301.148 – Date Last Insured (DLI) Credits you earn after becoming blind still count toward that requirement.5Social Security Administration. If You’re Blind or Have Low Vision — How We Can Help The result is a DLI that extends well beyond what the standard rules would allow.
How the Disability Freeze Protects Your DLI
When SSDI is approved, Social Security typically grants a “disability freeze,” formally a period of disability. It does two things. The years you earned little or nothing because of the disability are excluded from the calculation of your future benefit amount, so your payment reflects your pre-disability earnings. And the freeze preserves your insured status, keeping your DLI from sliding forward while you cannot work.6Social Security Administration. DI 10105.005 – Eligibility for Disability Insurance Benefits (DIB) or the Disability Freeze
The freeze matters most when an onset date sits several years in the past. Without it, someone who became disabled years ago but is only now applying might find their insured status had already lapsed. The freeze locks the insured status as of onset, which lets current payments be based on the older claim. If you recover and return to work, the freeze ends and you accumulate new credits normally.
How to Check Your DLI
The simplest way to find your DLI is through your Social Security Statement. It lists your earnings and credits by year. You can view it online by creating an account at ssa.gov/myaccount, and if you’re 60 or older and don’t have an online account, Social Security mails a statement three months before your birthday.7Social Security Administration. Get Your Social Security Statement You can also request one by mail using Form SSA-7004.8Social Security Administration. Request for a Social Security Statement (SSA-7004)
Your statement won’t print the words “Date Last Insured,” but the year-by-year earnings and credit totals give you what you need. If you have stopped working, or you are thinking about a long career break, count the credits inside the most recent 10-year window. When that number falls below 20, your disability-insured status has lapsed. Return to work and new credits can push your DLI forward again, but the disability itself has to begin during a quarter when you are insured. Reviewing your statement while you’re healthy is the easiest way to avoid a surprise later.