Alleged Onset Date: How to Choose the Right Start Date

TL;DR: Your alleged onset date (AOD) is when you claim your disability began. It affects your backpay amount, the evidence the SSA reviews, and sometimes whether you qualify at all. Generally, your AOD should be the date you stopped working or the date your condition became severe enough to prevent SGA-level work. Setting it too early without supporting evidence hurts your credibility. Setting it too late costs you backpay. SSDI backpay can only go 12 months before your application date.

Your onset date is one of the most strategically important decisions in your SSDI application. It determines how far back your benefits can be calculated, what medical evidence is relevant, and in some cases, whether you meet the DLI requirement at all.

What the Onset Date Means

The alleged onset date is the date you claim you became unable to work due to your disability. The SSA may accept your alleged date, or they may establish a different date based on the medical evidence.

Your onset date determines:

When the 5-month waiting period starts. Benefits begin in the sixth full month after onset.
How much backpay you receive. The further back the onset, the more retroactive benefits.
What evidence is relevant. The SSA focuses on your condition at and after the onset date.
Whether you meet DLI. Your onset must be before your Date Last Insured.

How to Choose Your Onset Date

Common Options

Option	When to Use
Last day of work	You stopped working specifically because of your condition
Date of injury/diagnosis	Sudden event (accident, stroke, diagnosis of serious illness)
Date symptoms became disabling	Gradual onset condition that worsened over time
12 months before application	Strategic choice for maximum retroactive benefits

The 12-Month Retroactive Limit

SSDI backpay can only go back 12 months before your application date (after accounting for the 5-month waiting period). So even if your onset was 3 years before you applied, your first payable month is 12 months before your filing date. Setting an onset date more than 17 months before your application date doesn't increase your backpay.

Exception: if you need an earlier onset to prove disability before your DLI, the earlier date matters even if it doesn't increase backpay.

Risks of Choosing Wrong

Onset Too Early

If you allege an onset date of 2020 but your medical records from 2020-2022 show minimal treatment and no significant limitations, the SSA will question your credibility. They may deny your entire claim or establish a later onset date that costs you backpay.

Onset Too Late

Setting an unnecessarily late onset date means leaving backpay on the table. If you stopped working 18 months ago because of your condition, don't allege an onset of last month.

Amended Onset Date

If you're at an ALJ hearing and the judge suggests a later onset date than what you alleged, your representative may agree to an "amended onset date." This is a strategic move: accepting a later onset can get you approved when the judge has concerns about the earlier date. You lose some backpay but gain approval.

ClaimPath helps you identify the optimal onset date based on your work history, medical timeline, and DLI. $79 flat fee.

Start your application with ClaimPath

Frequently Asked Questions

What is the process for alleged onset date: how to choose the right start date?

TL;DR: Your alleged onset date (AOD) is when you claim your disability began. It affects your backpay amount, the evidence the SSA reviews, and sometimes whether you qualify at all. Generally, your AOD should be the date you stopped working or the date your condition became severe enough to prevent SGA-level work.

Alleged Onset Date: How to Choose the Right Start Date