FERS High-3 Salary: 3 Costly Mistakes to Avoid

The short answer: Your FERS high-3 salary is the average of your highest 36 consecutive months of basic pay. It sets the size of your pension. Basic pay can include locality pay and shift rates. It excludes overtime, bonuses, awards, and travel pay. Small payroll details may quietly shrink it.

For most federal employees nearing retirement, the FERS high-3 salary is one of two numbers that decide a lifetime annuity. Understanding what counts toward it may help. Knowing what does not count helps too. Together they let you read your benefit estimate with clearer eyes.

What is the FERS high-3 salary?

The FERS high-3 salary is the highest average basic pay you earned during any three consecutive years of service. According to the U.S. Office of Personnel Management, these are usually your final three years of work. They can be an earlier period instead. That applies if your basic pay happened to be higher then.

• It is an average, not your final salary. OPM defines it as your highest average basic pay over any 3 consecutive years of service. A single high year alone does not set it (OPM, FERS Computation).
• Basic pay includes locality pay and shift rates. OPM describes “rate of basic pay” as the rate fixed for your position. That includes a locality rate, but excludes additional pay of any other kind (OPM, Maximum Payable Rate Rule).
• Overtime and bonuses do not count. OPM states basic pay “does not include payments for overtime, bonuses, etc.” So a year of heavy overtime may not lift your high-3 at all.
• The multiplier is usually 1% per year of service. OPM uses 1 percent of your high-3 average salary for each year of service. The factor rises to 1.1 percent if you separate at age 62 or older with at least 20 years of service.
• The highest 3 years need not be your last 3. OPM notes the period can be earlier if your pay was higher then. That can matter after a downgrade or a move to part-time hours.

How is the FERS high-3 salary actually calculated?

To find the FERS high-3 salary, you average your basic pay across the highest 36 consecutive months of your career. OPM describes it as the highest average basic pay earned during any three consecutive years of service. The months must run consecutively. You cannot cherry-pick scattered high points.

The figure tracks a continuous 36-month window. So the timing of raises, step increases, and locality adjustments can all influence where that window lands. The window does not have to end on your retirement date. If an earlier stretch of your service paid more, OPM indicates that earlier period can serve as the high-3 instead.

What pay counts toward basic pay?

Basic pay is the salary you earn for your position. It includes increases for which retirement deductions are withheld, such as shift rates. OPM also treats a locality rate as part of the rate of basic pay. Several common forms of compensation sit outside that definition.

• Counts: base salary, locality pay, shift differentials, and other amounts subject to retirement deductions.
• Does not count: overtime, bonuses, awards, travel pay, and similar extra payments.

How does the FERS high-3 salary turn into a pension? (A worked example)

Your pension is your FERS high-3 salary multiplied by your years of service and a percentage factor. OPM applies 1 percent of the high-3 for each year of service in most cases. The factor becomes 1.1 percent if you retire at age 62 or older with at least 20 years of service.

Suppose an employee retires with a high-3 average salary of $100,000 and 30 years of creditable service. At the standard 1 percent factor, the annual annuity is $100,000 × 30 × 1% = $30,000 per year. That figure comes before any reductions or survivor elections.

Now imagine the same employee waits and retires at age 63 with those same 30 years. They meet the age 62 plus 20 years condition. So OPM applies the 1.1 percent factor instead: $100,000 × 30 × 1.1% = $33,000 per year. The higher factor reflects a roughly 10 percent larger benefit for the same high-3 and service, as described on OPM’s computation page. The FERS 1.1 percent multiplier rules explain when that boost may apply.

What mistakes can shrink your FERS high-3 salary?

The most common surprises come from misreading what enters basic pay. Late-career changes cause others. None of these are hidden penalties. They simply follow from how OPM defines the average.

Mistake 1: Counting overtime and bonuses as part of the average

Overtime, bonuses, awards, and travel pay can make a final paycheck look large. Yet OPM excludes them from basic pay. An employee who banks heavy overtime in the final years may find their high-3 looks lower than expected. None of that overtime entered the calculation.

Mistake 2: Overlooking a late downgrade or reduced schedule

A voluntary downgrade, a reassignment to a lower-paying position, or a shift to part-time hours late in a career can pull down the most recent 36 months. The high-3 need not be the final three years. So an earlier higher-paid period may sometimes produce a larger average. Employees moving to part-time should also review how part-time FERS service is pro-rated. That affects the benefit separately from the high-3.

Mistake 3: Retiring just before a factor or service milestone

Leaving shortly before reaching age 62 with 20 years of service may mean the 1 percent factor applies rather than 1.1 percent. Separately, retiring early under certain provisions can trigger an age reduction. Under the MRA+10 provision, OPM reduces the benefit by 5 percent for each year you are under age 62 when the annuity begins. Postponing the start date can reduce or remove that cut. The mechanics of the MRA+10 reduction and how postponing works are worth reviewing before choosing a date.

Can you check your own FERS high-3 salary?

You can estimate your FERS high-3 salary yourself. Average your basic pay across your highest 36 consecutive months, using the pay that appears with retirement deductions withheld. Your agency’s human resources office and your benefits estimates generally rely on the same OPM definitions. So comparing your own figure to an official estimate may surface any discrepancies early.

Keeping copies of your SF-50 personnel actions can help. They document your basic pay rate at each step. OPM’s FERS computation guidance remains the primary reference for what does and does not count.

Frequently asked questions

Is the FERS high-3 salary based on my final three years?

Not necessarily. OPM describes the high-3 as your highest average basic pay over any three consecutive years of service. These are usually the final three years. An earlier period may be used if your basic pay was higher then.

Does locality pay count toward the FERS high-3 salary?

Generally yes. OPM treats a locality rate as part of the rate of basic pay, alongside your underlying salary and shift rates. Amounts outside that definition, such as overtime and bonuses, are not included.

Why doesn’t my overtime increase my high-3?

OPM states that basic pay “does not include payments for overtime, bonuses, etc.” The high-3 averages only basic pay. So overtime earnings do not raise the figure, even if they raise your take-home pay.

How does the high-3 connect to my pension amount?

OPM multiplies your high-3 average salary by your years of service and a percentage factor. That factor is typically 1 percent per year. It rises to 1.1 percent if you retire at age 62 or older with at least 20 years of service.

Can a late pay cut lower my FERS high-3 salary?

It can. A downgrade or reduced schedule in your final years may lower the most recent 36-month average. The high-3 can come from an earlier period. So an earlier higher-paid window may sometimes produce a larger average instead.

Where can I confirm these rules myself?

OPM’s FERS computation page and pay administration fact sheets are the primary sources. They define basic pay, the high-3 average, and the 1 percent and 1.1 percent factors used in the annuity formula.

Learn more at a free Fed Pilot workshop

Your FERS high-3 salary deserves a careful look well before you set a retirement date. Small details in your basic pay can make a meaningful difference. Fed Pilot offers free educational workshops for federal employees. There you can explore how the high-3, service time, and the annuity factors fit together. Register for a free Fed Pilot workshop to keep learning at your own pace.