Federal Employee Medical Retirement Calculator
Estimate a FERS disability retirement benefit using your high-3 salary, service time, age, and expected Social Security disability amount. This interactive tool is designed for federal employees who need a fast, practical estimate before filing or planning a separation.
Calculator Inputs
Enter your annual high-3 average salary before retirement.
Use total creditable civilian service for retirement computation.
Your age on the date disability retirement begins.
Enter your monthly Social Security Disability Insurance estimate.
Included here for future age-62 earned annuity estimation.
Used to estimate age-62 recomputation only.
FERS disability: first year is generally 60% of high-3 minus 100% of SSDI, then 40% of high-3 minus 60% of SSDI until age 62. Regular annuity uses the standard FERS multiplier.
Results
Enter your information and click calculate to view estimated monthly and annual retirement figures.
How to Use a Federal Employee Medical Retirement Calculator
A federal employee medical retirement calculator helps estimate the income a federal worker may receive after leaving service because a medical condition prevents useful and efficient performance. In practice, most people searching this phrase are trying to estimate a FERS disability retirement benefit. That matters because the formula is not the same as a standard immediate voluntary retirement. It also interacts with Social Security Disability Insurance, usually called SSDI.
This page is designed to give you a practical estimate, not a final Office of Personnel Management adjudication. OPM makes the formal determination, reviews eligibility, and calculates the official annuity. Still, a calculator is extremely valuable because it helps you answer the questions that matter most: what might I receive in the first year, what may I receive after the first year, how does SSDI affect the payment, and how could the benefit be recomputed at age 62?
For many employees, medical retirement planning is not only about replacing wages. It is also about preserving family cash flow, evaluating whether private disability insurance is necessary, understanding FEHB continuation options, and deciding whether a resignation, OWCP claim, postponed retirement, or disability retirement application makes the most financial sense. A good calculator is the first step in that analysis.
What counts as federal employee medical retirement?
In common conversation, people often say “medical retirement” when they mean disability retirement under the Federal Employees Retirement System. Under FERS, an employee generally must have at least 18 months of creditable civilian service and a medical condition expected to last at least one year, with the condition preventing useful and efficient service in the current position. The employing agency also must be unable to accommodate the condition in the current job and unable to reassign the employee to a vacant position at the same grade or pay level within the commuting area.
That is why this calculator asks for your high-3 salary, years of service, age, and SSDI estimate. Those are the major figures needed to build a meaningful estimate under the standard FERS disability rules. If you are in CSRS, a special category, or a law enforcement or firefighter retirement system, the rules can differ and you should confirm your exact computation basis before relying on any estimate.
The core FERS disability retirement formula
For most approved FERS disability retirees who are under age 62, the widely cited OPM calculation works like this:
- First 12 months: 60% of your high-3 average salary minus 100% of your Social Security disability benefit.
- After the first 12 months until age 62: 40% of your high-3 average salary minus 60% of your Social Security disability benefit.
- At age 62: the annuity is generally recomputed as if you had continued working until age 62, with service credit added and your high-3 adjusted by applicable cost-of-living increases.
The important takeaway is that the first-year benefit is usually higher than the later pre-age-62 benefit, and SSDI creates a substantial offset. That is why a calculator is useful. A retirement estimate that ignores SSDI can be dramatically overstated. A calculator that ignores the age-62 recomputation can also understate long-term value.
| Benefit stage | Base percentage of high-3 | SSDI offset applied | General planning implication |
|---|---|---|---|
| First 12 months of FERS disability retirement | 60% | 100% of SSDI benefit | Usually the strongest cash flow period before the annuity steps down. |
| After first year and before age 62 | 40% | 60% of SSDI benefit | Often the most important phase for long-term household budgeting. |
| Regular FERS annuity age 62 or older with under 20 years | 1.0% x high-3 x years | None in standard annuity formula | Useful as a comparison point when weighing disability versus earned retirement. |
| Regular FERS annuity age 62 or older with 20 or more years | 1.1% x high-3 x years | None in standard annuity formula | Shows why age and service length matter in planning. |
Why high-3 salary matters so much
Your high-3 average salary is the average of your highest paid consecutive 36 months of basic pay. It usually includes locality pay and shift differentials that count as basic pay, but not overtime, bonuses, or most allowances. Because the formula is built directly on the high-3, even a small change in this number can create a meaningful annuity change. If your earnings rose sharply in the last few years, verify whether your top three years are the latest three calendar years or a different 36-month period.
Many applicants make a simple planning mistake: they use their current salary rather than their actual high-3. That can produce an unrealistic estimate. The more precise the high-3 number, the more useful the calculator becomes.
How SSDI changes the estimate
One of the biggest sources of confusion is the relationship between SSDI and FERS disability retirement. The disability annuity and SSDI are not simply added together. Instead, the federal annuity is reduced by a statutory offset. During the first year, the offset is larger because the formula subtracts 100% of the SSDI benefit. After that, the offset drops to 60% of SSDI. This means a claimant with a high SSDI award can see a noticeably smaller FERS payment than expected.
For that reason, this calculator uses your expected monthly SSDI figure and converts it into an annual amount. If you have not applied for SSDI yet, you can still model scenarios with a low, medium, and high estimate. That is often the best way to test your income risk.
Sample comparison table using the statutory FERS disability formula
The examples below use the actual statutory percentages used in FERS disability planning. They are illustrations only, but they show how sharply outcomes can differ depending on salary and SSDI.
| High-3 salary | Monthly SSDI | Estimated first-year annual annuity | Estimated annual annuity after first year | Estimated monthly annuity after first year |
|---|---|---|---|---|
| $70,000 | $1,200 | $27,600 | $19,360 | $1,613 |
| $90,000 | $1,400 | $37,200 | $27,920 | $2,327 |
| $120,000 | $1,800 | $50,400 | $35,040 | $2,920 |
These sample figures come straight from the standard computation logic: first-year annual annuity equals 60% of high-3 minus annual SSDI, and the later annual annuity equals 40% of high-3 minus 60% of annual SSDI. They are not promises of payment, but they are strong planning examples because they reflect the real percentages used in the FERS disability framework.
What happens at age 62
Age 62 is a major milestone in disability retirement planning. OPM generally recomputes the disability annuity as though you had continued working until age 62. For many employees, this is where long-term value emerges. Service credit is generally added for the disability period, and the high-3 may be adjusted by cost-of-living changes for recomputation purposes. This is why some employees compare the short-term step-down after the first year with the long-term possibility of a stronger annuity later.
The calculator on this page includes an estimated age-62 projection using an assumed COLA growth rate and additional service time. It is an estimate only, but it helps frame the strategic question: is the disability retirement path preserving future annuity value in a way that a simple separation would not?
When a regular earned annuity may be a better benchmark
Some federal workers are already close to an optional retirement threshold. If you are near age 62 or have substantial creditable service, it can be useful to compare a disability estimate with a regular earned annuity estimate. That is why this tool includes a regular FERS annuity mode. In that mode, the estimate uses the standard multiplier of 1.0% of high-3 per year of service, or 1.1% if you are age 62 or older with at least 20 years of service.
This comparison does not tell you which path is legally available, but it does help you compare cash flow. If the earned annuity is close to the disability annuity, your strategic decision may depend more on health insurance continuation, work capacity, SSDI timing, and legal eligibility than on the raw monthly number alone.
Step-by-step guide to using the calculator effectively
- Gather your latest retirement estimate, SF-50 information, and payroll records.
- Confirm your approximate high-3 average salary rather than guessing from current pay.
- Enter your total creditable years of service.
- Enter your age at retirement because age affects both comparisons and the age-62 recomputation horizon.
- Estimate your SSDI amount carefully. If uncertain, run multiple scenarios.
- Use the FERS disability mode first, then compare with earned annuity mode if you are near regular retirement eligibility.
- Review the chart and result cards for first-year, after-first-year, and projected age-62 values.
Common mistakes people make when estimating federal medical retirement
- Using gross current salary instead of high-3 average salary.
- Ignoring the SSDI offset and therefore overstating net annuity.
- Assuming the first-year annuity continues unchanged after month 12.
- Failing to compare the disability estimate to a regular earned annuity.
- Ignoring age-62 recomputation and future service credit effects.
- Assuming all forms of pay count toward the high-3 calculation.
- Relying on informal forum posts instead of OPM and SSA guidance.
Authoritative sources you should review
If you are making a real retirement decision, read the official source materials. Start with the U.S. Office of Personnel Management retirement guidance, then review Social Security disability information, and if needed consult your agency HR office or a qualified federal retirement professional.
- OPM: FERS types of retirement
- OPM: FERS annuity computation
- Social Security Administration: Disability benefits
Planning issues beyond the calculator
A calculator gives you the number, but a retirement decision involves much more than the formula. Federal employees should also examine FEHB continuation, survivor election costs, tax treatment, workers’ compensation interactions, Thrift Savings Plan withdrawal strategy, and whether a spouse’s health coverage can reduce pressure on retirement timing. If your medical condition may improve, think about reemployment rules and ongoing medical review requirements. If your condition is permanent and severe, a more conservative budget model may be appropriate.
It is also smart to plan around timing. A difference of a few months can affect service credit, leave balances, paperwork readiness, and the exact high-3 period. If your salary is scheduled to rise soon, the benefit impact may be meaningful. Likewise, if your SSDI claim is pending, your household income may be volatile for a period, so emergency savings and temporary work restrictions should be mapped out in advance.
Bottom line
A federal employee medical retirement calculator is best understood as a decision-support tool. It helps estimate likely FERS disability retirement income, compare the first-year and later formulas, account for the SSDI offset, and preview the age-62 recomputation concept. Used properly, it can help you ask better questions before you file and can reduce the risk of retirement planning based on assumptions rather than math.
The calculator above is especially useful for scenario testing. Change the high-3 salary, adjust the SSDI amount, compare disability mode to earned annuity mode, and review the chart. That process often reveals the most important planning insight: the right retirement strategy depends not just on eligibility, but on how the annuity behaves over time.