Your FERS pension may look like a benefit that’s simply calculated for you when you retire. But several decisions you make during your federal career can affect the amount of that monthly payment for the rest of your life. A promotion can change your high-3. Another year of service can increase both your service credit and, in some cases, the percentage used to calculate your annuity. Military service may count if you make the required deposit. And unused sick leave can add additional service credit to your pension calculation.
The important question isn’t simply whether you can increase your pension. It’s whether a particular decision is worth what it costs you in time, money, or flexibility. To see how those decisions can affect the numbers, we’ll follow a hypothetical federal employee named Maria. Her figures are illustrative only, but you can use the same approach with your own retirement estimate.
First, Know the FERS Pension Calculation Formula
For most employees covered by FERS, the basic pension calculation starts with three variables:
| Variable | What It Means |
|---|---|
| High-3 average salary | Your highest average basic pay during any three consecutive years of creditable service |
| Creditable service | Your years and full months of service used in the annuity calculation, including certain additional service credit when applicable |
| Multiplier | Generally 1%, or 1.1% if you retire at age 62 or older with at least 20 years of service |
According to the Office of Personnel Management’s FERS computation rules, the general formula is:
High-3 average salary × years of creditable service × applicable multiplier = annual basic annuity
Suppose Maria is 60 years old, has 25 years of creditable service and a $92,000 high-3. If she retires now under the regular 1% formula, her basic calculation would be:
$92,000 × 25 × 1% = $23,000 per year
That’s our starting point. Now consider five decisions that could change it.
Decision 1: Have You Maximized Your High-3?
Your high-3 is not automatically your final three calendar years of employment. OPM defines it as your highest average basic pay earned during any three consecutive years of creditable service. For many career employees, that will be near the end of their careers because their pay has generally risen over time. But that’s not a requirement. Basic pay for this purpose generally includes the pay from which retirement deductions are taken, including locality payments. It does not generally include bonuses or ordinary overtime pay. Certain employees and types of premium pay are subject to special rules, so don’t assume every item on your earnings statement belongs in the high-3 calculation.
That makes promotions, step increases and changes in locality potentially important late in a career.
Suppose Maria’s career plans already include taking a higher-paying position, and holding that position long enough raises her eventual high-3 from $92,000 to $105,000. With 25 years of service and the regular 1% multiplier, the difference would be:
$105,000 × 25 × 1% = $26,250 per year
Compared with her original $23,000 calculation, that’s $3,250 more per year.
But timing matters. A higher salary doesn’t replace all three years of your high-3 the moment you receive it. If you receive a raise shortly before retiring, only the period during which you earned that higher rate becomes part of the average.
That’s why it makes more sense to calculate the effect of a promotion, step increase or locality change than to assume that staying for one additional pay raise will automatically produce a large pension increase.
Decision 2: What Is Another Year of Federal Service Worth?
Working another year affects more than your retirement date. It ordinarily adds another year to the service portion of the FERS formula and may also increase your high-3 if your salary rises during that period.
Using Maria’s original $92,000 high-3 and the 1% multiplier, one additional year of service by itself is worth approximately:
$92,000 × 1 × 1% = $920 more per year
If her high-3 also rises while she works that additional year, the actual increase could be larger.
This gives Maria a useful way to evaluate the decision. Instead of simply saying, “I’ll get a bigger pension if I work another year,” she can put an approximate dollar value on that year and compare it with what delaying retirement means to her.
That becomes especially important as age 62 approaches, because another retirement rule can make the calculation considerably more significant.
Decision 3: Are You Leaving Military Service Credit Out of Your Pension?
Prior active-duty military service can sometimes be credited toward a civilian FERS annuity, but it generally isn’t as simple as adding those military years to your federal career.
In general, active-duty military service performed after 1956 requires a military service deposit to receive credit under FERS. Employees should address the deposit while still employed; if you’re within six months of retirement, OPM instructs you to submit the deposit request with your retirement application. The rules can be more complicated for employees receiving military retired pay, so anyone with prior military service should determine how the rules apply to his or her particular record well before retirement.
OPM provides additional information about creditable service under FERS, and employees who are still working can begin the deposit process with Standard Form 3108, Application to Make Service Credit Payment/FERS.
Suppose Maria has two years of eligible active-duty military service and makes the required deposit so those two years can be included in her annuity computation. Using her original $92,000 high-3 and 1% multiplier, those two years would add approximately:
$92,000 × 2 × 1% = $1,840 per year
Whether making the deposit is financially worthwhile depends on the amount Maria must pay, any applicable interest, when she expects to retire and her individual circumstances. The important planning step is to obtain the deposit calculation early enough to make an informed decision rather than discovering the issue while preparing a retirement application.
Decision 4: Do You Know What Your Unused Sick Leave Will Add?
Unused sick leave can increase the service used to calculate a FERS annuity. But it is important to understand what sick leave can and cannot do.
Unused sick leave generally cannot be used to establish your initial eligibility requirements for retirement. Instead, after you’ve met those requirements, qualifying unused sick leave is added when OPM computes the amount of your annuity.
OPM uses a 2,087-hour work year when converting unused sick leave into additional service credit. The calculation ultimately uses years and full months of service, with a remaining fractional month dropped from the annuity computation.
For planning purposes, that means a large sick leave balance can have real value, but you shouldn’t simply divide your hours by a rough number of hours per month and assume that will be OPM’s final service calculation.
Suppose Maria’s final service calculation includes six additional full months attributable to unused sick leave. At a $92,000 high-3 and a 1% multiplier, that additional half-year would be worth approximately:
$92,000 × 0.5 × 1% = $460 more per year
There is another reason to pay attention to sick leave near age 62. OPM has specifically addressed situations in which an employee is age 62 or older and unused sick leave affects the service used in determining the annuity computation. Although unused sick leave cannot be used to establish eligibility for retirement, once an employee is otherwise eligible for an immediate annuity at age 62 or older, the sick leave is added for computation purposes. If that addition brings the employee’s service to at least 20 years, the 1.1% formula can apply.
Decision 5: Does Waiting Until Age 62 Change the Entire Calculation?
For a regular FERS employee, age 62 can create a particularly important decision point.
Under OPM’s formula, an employee who retires at age 62 or older with at least 20 years of service receives a 1.1% multiplier instead of the standard 1%. Both conditions matter.
| Condition at Retirement | General Multiplier |
|---|---|
| Does not meet both the age-62 and 20-year conditions | 1% |
| Age 62 or older with at least 20 years of service | 1.1% |
The difference between 1% and 1.1% may look tiny, but it’s a 10% increase in the multiplier applied to the applicable high-3 and service calculation.
Suppose Maria doesn’t retire at 60. She continues working until 62. Her 25 years of civilian service therefore becomes 27 years before considering any other service credit.
If her high-3 remained $92,000, the difference between the two multipliers on those 27 years would be:
At 1%: $92,000 × 27 × 1% = $24,840 per year
At 1.1%: $92,000 × 27 × 1.1% = $27,324 per year
Notice that waiting changed Maria’s pension in two ways: she accumulated two additional years of service, and she became eligible for the larger multiplier.
That’s why someone approaching age 62 should compare actual retirement dates rather than looking only at the 10% multiplier increase.
Special-provision employees have different computation rules. For qualifying law enforcement officers, firefighters and certain other special-category employees, OPM generally uses 1.7% of high-3 for qualifying service up to 20 years and 1% for service beyond 20 years. Those employees should use the formula applicable to their particular retirement coverage rather than the regular FERS examples in this article.
What If Maria Combines Several of These Decisions?
Now we can see why retirement planning is more useful than looking at any one factor in isolation.
Start with Maria at age 60:
| Retire at 60 | Illustrative Retire-at-62 Scenario | |
|---|---|---|
| High-3 | $92,000 | $105,000 |
| Civilian service | 25 years | 27 years |
| Military service deposit | None included | 2 years |
| Additional sick leave credit | None included | 6 months |
| Total service used in illustration | 25 years | 29.5 years |
| Multiplier | 1% | 1.1% |
| Illustrative annual pension | $23,000 | $34,073 |
That’s an illustrative difference of about $11,073 per year.
But there’s an important warning hidden inside that number: it would be misleading to attribute the entire increase to a single retirement “strategy.”
Maria worked two additional years. She earned a higher high-3. She included eligible military service after making the required deposit. Her unused sick leave added service for computation purposes. And retiring at 62 with sufficient service changed her multiplier.
Each has its own cost, requirement or tradeoff.
Before You Delay Retirement, Compare the Increase With What You’re Giving Up
A larger pension isn’t automatically a better retirement decision.
If Maria is considering working from 60 to 62, she shouldn’t look only at the higher annual annuity. She also needs to consider two additional years of salary, TSP contributions and potential agency matching, Social Security implications, health coverage, taxes and other financial factors.
But there is another side of the ledger: she is also postponing retirement by two years.
For some employees, the additional financial security will easily justify staying. Others may place greater value on retiring earlier, traveling, spending time with family, pursuing another career or simply having more control over their time.
The useful question isn’t, “How long should a federal employee work?” It’s:
What am I gaining financially by working longer, and is that gain worth delaying retirement to me?
That’s a question you can begin answering with actual numbers.
Checklist and Worksheet: Take the Next Step
Two things can help before you commit to a retirement date. A checklist, to confirm you haven’t missed a lever that’s already available to you. And a worksheet, to compare two possible retirement dates side by side using the same numbers walked through above.
The checklist covers eight steps, from reviewing your SF-50s to confirming your military service deposit and sick leave balance. The worksheet walks through the same eight figures used in Maria’s examples — high-3, years of service, military and sick leave credit, and multiplier — for two retirement dates of your choosing, with a line-by-line explanation of what to fill in.
Both are included in one free, printable PDF: Download the FERS Pension Planning Checklist and Worksheet (PDF).
This is only a planning worksheet. Your agency and OPM ultimately determine your creditable service and retirement benefit under the rules applicable to your individual record.
Frequently Asked Questions
Does unused sick leave count toward my FERS pension?
Yes, but only for the annuity computation, not eligibility. OPM converts unused sick leave to additional service credit using a 2,087-hour work year and adds the resulting credit to your service when calculating your pension amount.
Does military service count toward my FERS pension?
It can. Active-duty military service performed after 1956 generally requires a military service deposit to receive credit under FERS. Employees should address the deposit process before retirement; OPM provides separate instructions for employees who are within six months of retiring.
What is the FERS 1.1% multiplier, and how do I qualify?
The multiplier increases from 1% to 1.1% per year of service if you retire at age 62 or older with at least 20 years of total creditable service. Both conditions must be met together, and the higher rate applies to your entire service history, not just years past 20.
Does sick leave count toward the 20-year threshold for the 1.1% multiplier?
Yes. Although unused sick leave cannot be used to establish your eligibility to retire, OPM has specifically ruled that once you’re otherwise eligible for an immediate annuity at age 62 or older, unused sick leave is added for computation purposes. If that addition brings your service to at least 20 years, the 1.1% formula applies.
Is my high-3 salary always my final three years of service?
Not necessarily. Your high-3 is whichever three consecutive years produced your highest average basic pay, usually, but not always, your final three years. It’s worth checking your SF-50s to confirm rather than assuming.
Is a bigger pension always worth working longer for?
Not automatically. Working longer typically increases your pension, but it also means giving up retirement time and should be weighed against TSP contributions, Social Security timing, health coverage, and how you personally value time versus income.
Bottom Line
You don’t need to chase every possible increase in your FERS pension. You need to know which decisions matter for your situation. Start with your likely high-3 and current service. Check any military service that may be creditable. Understand what your sick leave can add. And if you’re approaching age 62, calculate what happens on both sides of that retirement date. Then compare the additional lifetime income with what it takes to get it. The goal isn’t necessarily to produce the largest pension mathematically possible. It’s to make sure the retirement date you choose gives you the combination of income and time that makes the most sense for you.