What Is My Disability Onset Date?

You may have heard the term “established onset date” (EOD) before. This date affects when you can start receiving benefits. 

When you apply for Social Security Disability Insurance (SSDI) benefits, you’ll need to meet the eligibility factors. The SSA will check that you have enough work credits to qualify for the program. If you’ve applied for the Supplemental Security Income (SSI) program, the SSA will ensure you have limited income to qualify. 

This article discusses disability benefit applications and how the SSA determines your EOD. If you need help with applying for benefits, a disability law attorney can guide you through the process.

Established Onset Date vs. Alleged Onset Date

SSA decision-makers look first to your alleged onset date (AOD) to determine your EOD. Your AOD is when you think you became unable to engage in work activity due to physical or mental impairment(s). The AOD is usually not the same as your application date.

Your monthly benefits may be affected if the SSA finds your EOD is later than your AOD. For example, your benefits, such as back pay or retroactive benefits, may be reduced.

But suppose your AOD is consistent with the evidence and you meet the eligibility requirements. In that case, the decision-makers find that the date (your AOD) is your EOD.

At the initial and reconsideration levels, the Disability Determination Services (DDS), a state agency, determines your EOD. While the decision-makers at the DDS have discretion, the EOD cannot conflict with the medical evidence.

How To Figure Out Your Onset Date

To establish the EOD, decision-makers use some of the following evidence and factors:

• Claimant’s statements: The SSA considers your statements about your medical condition. These statements include when you think your disabling condition began. These statements are included on the application and the Adult Disability Report, Form SSA-3368-BK.
• Work history: The SSA also considers the date you stopped working at substantial gainful activity (SGA) levels. This monthly amount is $1,690 in 2026 for non-blind individuals and $2,830 for blind individuals. Your EOD is generally after you stop working at SGA levels.
• Medical and related evidence: You should submit to the SSA all available and relevant medical records. Sometimes, a decision-maker can’t decide based on your medical history and other evidence. In those cases, the decision-maker may infer an EOD. At the Administrative Law Judge (ALJ) level, the ALJ may ask a medical expert to assist with inferring an EOD.

For disabilities of a traumatic origin, the EOD is generally the day of the injury, even if you worked that day. The evidence must also show you met the definition of disability on that day. For example, a car accident on the way home from work caused a severe spinal cord injury, resulting in paralysis. Hospital records from that night can provide evidence. The date of the accident would likely be the EOD.

Special Cases in Disability Benefit Applications

Sometimes it takes more work to determine your EOD. You may consider speaking with a Social Security disability lawyer if you have a unique circumstance. Below are a few examples when the onset date may be more difficult to determine.

Childhood Disability Onset Date

One way the SSA pays Childhood Disability Benefits (CDB) is under the SSI program. The child must be younger than 18 and meet eligibility requirements.

Once the child turns 18, they are reevaluated by the SSA under the adult standard of disability. At this point, the now-adult child may lose benefits.

Also, suppose an adult child has a parent with a qualifying work record and receives Social Security benefits. In that case, the claimant may receive CBD when they turn 18. However, the claimant’s EOD must be before age 22, and the claimant must be unmarried and dependent on the wage earner.

Blindness Onset Date

The EOD is generally when the claimant meets the legal definition of statutory blindness and non-medical requirements. Sometimes, a claimant may meet both but continues to engage in SGA. Then, later, the claimant becomes unable to continue working. The SSA will identify that later date as the date of the entitlement to disability payments.

Intermittent Work

Certain conditions, such as chronic illnesses and degenerative diseases, can also complicate the onset date. Eventually, the illness may progress to the point of qualifying as a disability, but the exact inflection point can be murky.

In the meantime, a claimant might try to work despite the difficulty. Generally, the onset date is when their substantial gainful activity stops and they have medical evidence of the condition.

The SSA can excuse unsuccessful work attempts (UWAs) if you meet the following criteria:

• You were unable to work for at least 30 days or your condition forced you to change jobs prior to your work attempt’s start date.
• The job lasted six months or less at SGA levels. Jobs that last longer can also qualify as unsuccessful if they failed to meet SGA levels for more than six months.
• The condition was the reason you could no longer continue the job.

Imagine you accepted a job that would provide SGA income. You believe you might be able to meet the demands of the job despite your medical condition. Yet after a few weeks, you aren’t able to keep working after all. This job would likely be an unsuccessful work attempt. Because of this exception, your onset date for a disability claim could be earlier than when you started the short-term job.

Later, after you begin receiving benefits, you can also consider the Ticket to Work program. A trial work period can allow you to test whether your condition will allow you to return to work.

Can I Change My AOD on My Disability Application?

You may be able to amend your AOD if you do so before the date of the DDS decision. You may amend your AOD to a date of onset earlier or later than you originally said you first became disabled.

It might be a good idea to amend your AOD if you become aware of specific criteria the SSA uses in deciding the EOD. These are criteria you hadn’t considered when filing your benefits application.

When Will My Disability Benefits Start?

There is a five-month waiting period before the SSA will pay out benefits for a disability claim. The waiting period begins on the first full month after the EOD.

There is an exception for claimants with amyotrophic lateral sclerosis (ALS). In 2019, the ALS Disability Insurance Act removed this waiting period. Benefits can begin immediately after the SSA approves the ALS disability claim.

Get an Attorney’s Advice for Your SSDI Claim

Sometimes it’s complicated to figure out your AOD on your disability claim. An attorney can ensure you pick an appropriate AOD on your SSDI application or SSI application. Contact a Social Security disability attorney near you today to ensure you get the SSDI benefits or SSI benefits you deserve.