Eighteen Months on the Clock: The Service Rule That Can Make or Break an OPM Disability Claim

You have been a federal employee for a little over a year when an injury or a diagnosis changes everything. Doing your job now feels impossible, and one question keeps nagging at you: is your short time in government enough to qualify for disability retirement? For many employees under the Federal Employees Retirement System (FERS), the answer comes down to a single number.

What the 18 Month Rule Actually Says

Under 5 U.S.C. § 8451(a)(1)(A), a FERS employee who completes at least 18 months of civilian service creditable under 5 U.S.C. § 8411 and has become disabled can be retired on disability. The Office of Personnel Management (OPM) lists the same threshold on its FERS eligibility page and notes that it applies at any age. That is unusual, since most other FERS retirement benefits depend on a minimum age or many more years on the job.

Eighteen months gets you in the door, but it does not win the claim. You must also show that disease or injury keeps you from giving useful and efficient service in your position, that the condition is expected to last at least a year, and that your agency cannot accommodate you or reassign you.

What Counts Toward Your 18 Months

Section 8411 measures creditable service in full years and twelfths of a year, and any fraction of a month is dropped. A few details trip people up:

• The statute speaks of civilian service, so military time does not help you reach the 18 month mark.
• A break in service longer than three calendar days cannot be credited (5 U.S.C. § 8411(a)(2)).
• Leave without pay can chip away at your total. Credit is not allowed for more than six months of it in a calendar year, though leave for military duty or while receiving federal workers’ compensation is treated differently (5 U.S.C. § 8411(d)).
• Some earlier federal service may count, but certain periods require a deposit before they are credited (5 U.S.C. § 8411(b) and (f)).

If you are close to the line, it is worth pulling your service history and confirming the math before you decide anything.

The Filing Clock Matters Just as Much

Having enough service does not help if the application is late. Under 5 C.F.R. § 844.201(a)(1), a disability retirement application is timely only if it is filed before you separate from service or within one year afterward. OPM may waive that deadline if you were mentally incompetent on your separation date or within the following year, but the application must then be filed within one year after competency is restored or a court appoints a fiduciary, whichever comes first (5 C.F.R. § 844.201(a)(4)). You will also need to show OPM that you applied for Social Security disability benefits, or that you are not insured for them (5 C.F.R. § 844.201(b)(1)).

Short Tenure Is Not the Same as No Case

A new federal employee can still qualify, and a missed deadline or a miscounted month is a mistake that cannot always be fixed later. If your service time is borderline, get the numbers checked first.

If you are weighing next steps, our national OPM disability retirement attorneys at the Law Offices of Stephen Barszcz can review your service history, your medical evidence, and your timeline. We also represent federal workers well beyond Pinellas Park, so call us for a free evaluation wherever you are located, and ask us whether you meet the 18 month rule.

Source:
opm.gov/retirement-center/fers-information/eligibility/