FERS Disability Retirement: Eligibility, Benefit Calculation, and What Happens to Your TSP

FERS disability retirement is a separate retirement pathway for federal employees who become unable to perform their job due to illness or injury — and unlike voluntarily leaving federal service, it doesn't require reaching your Minimum Retirement Age. You can be 35 years old with just 18 months of service and qualify. But the financial picture is more complex than a regular FERS annuity: the benefit formula has three distinct phases, Social Security disability reduces what you actually receive, your TSP has different access rules, and everything converts to a regular FERS pension at age 62.

Eligibility Requirements

To qualify for FERS disability retirement, you must meet all of the following:¹

• Minimum service: At least 18 months of creditable civilian service under FERS. This is a notably low bar — you don't need 5 years or 10 years, just 18 months.
• Disabled while employed: You became disabled due to disease or injury while working in a FERS-covered position.
• Expected duration: The disability is expected to last at least one year.
• Agency accommodation: Your agency certified it cannot accommodate your medical condition in your current position and considered you for comparable vacant positions.
• SSDI application: If you are under age 62, you must show that you have applied for Social Security disability benefits. You do not have to be approved — but you must show you filed.
• Application timing: You must file your OPM application before separation or within one year after your last day of federal employment. OPM cannot waive this deadline except in cases of mental incompetency.

The disability standard OPM uses is whether you can perform your specific position — not whether you are unable to work at all. This is a lower standard than Social Security's "substantial gainful activity" test, which is why you can qualify for FERS disability retirement but still be denied SSDI.

How the Benefit Is Calculated

The FERS disability annuity has three distinct phases. In each phase, the formula produces a gross benefit — then OPM subtracts a portion of any SSDI you actually receive to determine your net monthly check.²

Phase 1: First 12 Months

Gross benefit = 60% × High-3 average salary
Net benefit = Gross − 100% of SSDI monthly benefit

A federal employee with a $100,000 High-3 salary who is also receiving $2,000/month in SSDI:

• Gross annual: 60% × $100,000 = $60,000 → $5,000/month
• SSDI offset (100%): − $2,000/month
• Net: $3,000/month from OPM (plus the $2,000 SSDI = $5,000 total)

Note that if your SSDI hasn't been approved yet in month 1, OPM pays the full $5,000 gross. When SSDI is eventually awarded with backpay, OPM will retroactively apply the 100% offset and collect the overpayment.

Also note: COLAs are not payable during the first 12 months of disability annuity entitlement.³

Phase 2: After 12 Months Until Age 62

Gross benefit = 40% × High-3 average salary
Net benefit = Gross − 60% of SSDI monthly benefit

Same employee, now in year 2:

• Gross annual: 40% × $100,000 = $40,000 → $3,333/month
• SSDI offset (60%): − $1,200/month (60% of $2,000)
• Net: $2,133/month from OPM (plus $2,000 SSDI = $4,133 total)

FERS COLAs apply during this period — the 40% base grows each year with the same COLA formula as regular FERS annuities (full CPI if ≤2%; flat 2% if CPI between 2–3%; CPI minus 1pp if CPI ≥3%).³

The Earned Annuity Floor

There's an important protection: if your regular FERS earned annuity (1% × High-3 × years of actual service) is larger than either the 60% or 40% formula result, you receive the earned annuity instead.² This protects long-tenured employees who would otherwise lose ground by being forced onto the disability formula.

Example: a 30-year federal employee with a $120,000 High-3 whose earned annuity is $36,000/year is better off with the earned annuity ($36,000) than the 40% disability formula ($48,000 gross... but wait, $48,000 is actually higher in this case). The floor matters most for Phase 1 (60% formula) for employees already near retirement with high earned annuities.

Phase 3: At Age 62

When you turn 62, OPM automatically recomputes your annuity using the regular FERS formula:²

Age-62 annuity = 1% (or 1.1%) × High-3 at disability retirement × (actual service + years spent on disability)

The years you spent receiving disability annuity count as creditable service for this recomputation — you accumulate service credit while on disability. If you received disability at age 42 and reach 62, those 20 years on disability add to your original service years. The High-3 salary is frozen at your disability retirement date (not updated to 62).

The 1.1% enhanced multiplier applies if you have 20+ actual service years and the computed age-62 annuity puts you at 62+. The SSDI offset does not apply at 62 — the disability formula ends and you receive the full regular FERS annuity going forward.

FERS Disability Benefit Estimator

Enter your details to estimate your disability annuity across all three phases. The estimator shows gross OPM payments and net OPM payments (after SSDI offset), plus your estimated age-62 regular FERS annuity.

TSP Withdrawal Rules Under Disability Retirement

This is where many federal employees get surprised. FERS disability retirement does not automatically give you penalty-free access to your TSP. The 10% early withdrawal penalty for TSP follows IRC §72(t) rules, which depend on your age at separation — not your disability status.

The Rule of 55

If you separate from federal service (for any reason, including disability) in the calendar year you turn 55 or older (50 or older for law enforcement officers, firefighters, and air traffic controllers), you can withdraw from your TSP without the 10% penalty.⁴ This applies regardless of whether you used a disability retirement or a regular retirement.

If You Separate Before 55

If your disability forces you out before the year you turn 55, the Rule of 55 does not apply. You have two options for penalty-free TSP access:

1. IRC §72(t)(2)(A)(iii) — Total and Permanent Disability: The IRS provides a penalty exception for individuals who are "totally and permanently disabled" as defined by §72(m)(7) — unable to engage in substantial gainful activity. However, the OPM disability standard (unable to perform your specific position) is lower than this IRS standard. FERS disability approval alone does not guarantee you qualify under §72(m)(7). If you are also approved for SSDI, that strengthens the case significantly. Consult a tax advisor before taking distributions and claiming this exception.
2. 72(t) Substantially Equal Periodic Payments (SEPP): You can set up a series of substantially equal periodic payments from your TSP under IRC §72(t)(2)(A)(iv). This locks in a withdrawal schedule for at least 5 years or until age 59½, whichever is later — and modifying the schedule before the period ends triggers retroactive penalties plus interest on all prior distributions.

FEHB in Disability Retirement

You can continue your Federal Employees Health Benefits (FEHB) coverage in disability retirement — but the same 5-year eligibility rule applies as for regular FERS retirement.⁵ You must have been continuously enrolled in FEHB for the five years immediately before your retirement date (or since your first opportunity to enroll, if that was less than five years ago).

If you meet the 5-year requirement, FEHB premiums in retirement are the same as for active employees — OPM continues to pay the government's share. This is one of the most valuable benefits of federal employment, and disability retirement preserves it (assuming you meet the 5-year threshold).

Once you turn 65 and become eligible for Medicare, the same Part B decision applies as for any federal retiree — whether to enroll in Part B alongside FEHB, and how your TSP withdrawals and any Roth conversions affect IRMAA surcharges.

Survivor Annuity Election

Disability retirees must make the same survivor annuity election as regular FERS retirees. If you are married, you must elect either the full survivor annuity (reduces your annuity by 10%), the partial survivor annuity, or no survivor coverage (requires your spouse's notarized consent).⁵

This election is irrevocable after the initial 18-month window post-retirement except in limited circumstances (divorce, spouse's death). The stakes are high: electing none saves you the 10% reduction, but your spouse loses all FEHB coverage at your death — a significant risk if your disability leaves you uncertain about life expectancy.

Return-to-Work Rules

OPM periodically asks disability retirees to submit to medical examinations to verify continued disability. You must comply unless you are 60 or older or have received the disability annuity for at least 5 years.¹

Separately, OPM monitors earnings. If in any calendar year your earnings from employment exceed 80% of the current pay rate for the position you held at retirement, OPM can terminate your disability annuity on the grounds that you are no longer disabled. This is called the "restored earnings capacity" rule — it applies regardless of what you're earning money doing. Part-time consulting, self-employment, or a completely different career all count toward this 80% threshold.

If your annuity is terminated under this rule, you have the right to be reinstated into federal service, although the process is complex.

Application Process

You must file two forms — either with your agency (if you're still employed or separated within 31 days) or directly with OPM:¹

• SF 3107 — Application for Immediate Retirement
• SF 3112 — Documentation in Support of Disability Retirement (your medical evidence, doctor's statements, and your narrative)

Simultaneously, you must submit a claim for Social Security disability benefits to your local SSA office and provide OPM with documentation showing you filed.

OPM reviews disability applications administratively — no hearing is required. The process typically takes several months. During review, OPM may pay an interim annuity to bridge the gap. If OPM denies the application, you can appeal to the Merit Systems Protection Board (MSPB).

COLA: When It Starts and What It Covers

FERS disability retirees receive COLAs on a different schedule than their regular counterparts:³

The 2026 FERS COLA was 2.0%, which means disability annuitants in phase 2 received a 2% increase on their 40% base. The SSDI offset is applied to the fixed dollar SSDI amount, not to the growing FERS base — so COLAs steadily improve the net payment over time.

How Disability Retirement Compares to Regular FERS Retirement

To put it in concrete terms, here's how the paths diverge for a federal employee who is 48 years old with 12 years of service and a $95,000 High-3:

The disability route provides substantially more income in the early years (60%/40% vs 1% × service), while the age-62 recomputed annuity ends up competitive with what a healthy peer would receive if they continued working.