1. Applying Without Enough Medical Evidence

One of the most frequent mistakes is submitting an application before you’ve gathered adequate medical documentation. The Social Security Administration (SSA) relies heavily on treatment records, test results, and physician statements. Without clear, consistent evidence linking your condition to your inability to work, your claim may be denied.

2. Missing Application Deadlines

Illinois SSDI applicants must meet strict deadlines for both the initial filing and any appeals. Missing even one date can force you to restart the process, costing valuable time and potentially losing eligibility for back pay.

3. Providing Inconsistent or Inaccurate Information

Your SSDI application, work history, and medical records must align. Discrepancies — even unintentional ones — can raise red flags and lead the SSA to question your credibility. Always double-check dates, job details, and medical history entries.

4. Continuing to Work Above the Earnings Limit

If you earn more than the SSA’s Substantial Gainful Activity (SGA) threshold while applying, the SSA may assume you can still work and deny your claim. Even part-time work that exceeds the limit can harm your case.

5. Ignoring Treatment Recommendations

Failing to follow prescribed treatments — such as attending therapy sessions, taking medications, or undergoing recommended tests — can make it seem like your condition isn’t serious or that you’re not trying to improve.

6. Waiting Too Long to Appeal a Denial

Many people give up after receiving a denial, but appealing is often the best path to approval. In Illinois, you have a limited window to request reconsideration or a hearing. Delaying can cause you to lose your appeal rights.

7. Not Seeking Professional Help

While it’s possible to file for SSDI on your own, many applicants benefit from an experienced SSDI attorney or advocate who understands Illinois-specific procedures, knows how to gather the right evidence, and can represent you in hearings.