How Much Will My FERS Pension Actually Be?

For most federal employees, the pension is the first number that makes retirement feel real.

You can watch your TSP balance rise and check your Social Security estimate, but the FERS pension feels different. It represents a monthly payment tied directly to your federal career—something you may receive for the rest of your life.

That makes the natural question:

How much will my FERS pension actually be?

At first, the calculation looks simple:

High-3 salary × years of service × pension multiplier

And at its core, that is the formula.

But the amount deposited into your bank account can be very different from the number produced by that first calculation. Your retirement age, service history, sick leave balance, military service, survivor benefit election, taxes, insurance premiums, and retirement category can all affect the final result.

That is why estimating a FERS pension requires more than multiplying salary by years of service.

Let’s walk through the calculation using Sarah, a federal employee preparing to retire after a long career.

Sarah’s Starting Point

Sarah is 57 years old and has 30 years of creditable FERS service.

Her estimated high-3 average salary is $100,000.

Because she is retiring before age 62, her basic FERS multiplier is 1%.

Her starting calculation is:

$100,000 × 1% × 30 years = $30,000 per year

Dividing that by 12 gives her an estimated gross monthly pension of:

$30,000 ÷ 12 = $2,500 per month

That is the number Sarah has been using in her retirement planning.

But it is only the beginning of the calculation.

The Basic FERS Pension Formula

For most regular FERS employees, the pension formula depends on age and years of service at retirement.

If you retire before age 62, or at age 62 or older with fewer than 20 years of service, the standard formula is:

High-3 average salary × 1% × years of creditable service

If you retire at age 62 or older with at least 20 years of service, the formula generally becomes:

High-3 average salary × 1.1% × years of creditable service

OPM calculates the basic annuity using your high-3 average salary and total creditable service. It adds the eligible periods of service and then drops any remaining fraction of a month from the final service total.

This article focuses on regular FERS employees. Different formulas may apply to certain law enforcement officers, firefighters, air traffic controllers, Members of Congress, congressional employees, and employees with a CSRS component.

Step 1: Calculate Your High-3 Average Salary

Your high-3 is not necessarily your salary on the day you retire.

It is the highest average basic pay you earned during any three consecutive years of creditable federal service. For many employees, this is the final three years of their career, but it can be an earlier period if their pay was higher then.

Basic pay generally includes salary amounts on which retirement deductions are withheld. It does not normally include overtime, bonuses, awards, or other types of additional compensation.

Suppose Sarah’s basic pay during her final three years was:

• Year 1: $96,000
• Year 2: $100,000
• Year 3: $104,000

A simplified high-3 estimate would be:

($96,000 + $100,000 + $104,000) ÷ 3 = $100,000

In practice, agencies calculate the high-3 using actual pay rates and the exact dates those rates were in effect. A raise that begins halfway through a year does not receive the same weight as a salary earned for the full year.

That is why your current salary and your high-3 may not be identical.

A Promotion Does Not Instantly Become Your High-3

Imagine that Sarah receives a promotion six months before retiring, increasing her salary from $100,000 to $115,000.

She may be tempted to calculate her pension using $115,000.

But she has not earned that salary for three full years.

The higher rate will improve her high-3, but it will be averaged with the lower salary rates from the rest of the three-year period.

This is an important consideration when comparing retirement dates. Working an additional year after a promotion, step increase, or pay adjustment may increase the high-3 and add another year of service at the same time.

That does not automatically mean working longer is the right decision. It means the value of waiting should be calculated rather than guessed.

Step 2: Determine Your Creditable Service

The next part of the formula is your total creditable service.

For many federal employees, this includes the years and months during which they worked in positions covered by FERS and had retirement deductions withheld from their pay.

But federal careers are not always that simple.

Creditable service may also be affected by:

• Unused sick leave
• Military service
• Temporary or nondeduction service
• Refunded retirement contributions
• Part-time employment
• Breaks in federal service
• Service under another retirement system

OPM adds the creditable periods together and uses completed years and months in the annuity calculation. Any remaining fraction of a month is dropped.

Suppose Sarah’s verified service is:

30 years, 7 months, and 18 days

The 18 days would not be used in the final computation. Her pension would be calculated using:

30 years and 7 months

Seven months can be expressed as:

7 ÷ 12 = 0.5833 years

Sarah’s service factor would therefore be approximately:

30.5833 years

Her estimated pension would become:

$100,000 × 1% × 30.5833 = $30,583 per year

That equals approximately:

$2,549 per month

Those seven additional months add about $49 per month compared with a calculation using exactly 30 years.

Step 3: Use the Correct Multiplier

Most regular FERS employees use either the 1% or 1.1% multiplier.

The 1.1% multiplier generally applies when the employee separates for retirement at age 62 or older with at least 20 years of service. Otherwise, the standard 1% formula generally applies.

This difference looks small.

It is not.

Suppose Sarah retires at 57 with 30 years of service and a $100,000 high-3:

$100,000 × 1% × 30 = $30,000 per year

Now suppose she works until 62 and retires with the same $100,000 high-3 and 35 years of service:

$100,000 × 1.1% × 35 = $38,500 per year

That is:

$8,500 more per year

or approximately:

$708 more per month

The difference comes from three sources:

1. Five additional years of service
2. The higher 1.1% multiplier
3. Potential increases to the high-3, which we intentionally left out of this simplified comparison

Sarah would also avoid five years of drawing retirement income from her TSP.

That does not mean age 62 is automatically the best retirement age. Five additional years of time and freedom have value too.

The purpose of the comparison is to show what the decision costs and what it buys.

The Value of the 1.1% Multiplier by Itself

To isolate the multiplier, assume two employees both retire with a $100,000 high-3 and exactly 30 years of service.

The employee using the 1% formula receives:

$100,000 × 1% × 30 = $30,000 per year

The employee eligible for the 1.1% formula receives:

$100,000 × 1.1% × 30 = $33,000 per year

The 1.1% multiplier adds:

$3,000 per year

or:

$250 per month

That increase generally continues for the life of the pension and becomes part of the base on which future eligible cost-of-living adjustments are calculated.

Step 4: Add Unused Sick Leave

Unused sick leave can increase a FERS pension, but it cannot normally make you eligible to retire.

OPM allows unused FERS sick leave to be added for annuity-computation purposes only. It does not replace the actual years of service needed to satisfy an age-and-service retirement requirement.

For example, an employee who is 57 with 29 years and 6 months of actual service cannot use six months of sick leave to reach MRA+30 eligibility.

But after the employee is otherwise eligible to retire, unused sick leave can increase the service used in the pension calculation.

OPM’s sick-leave conversion table is based on a 2,087-hour work year. Under that table:

• 174 hours is approximately 1 month
• 1,044 hours is 6 months
• 2,087 hours is 1 year

OPM uses 100% of an eligible FERS employee’s unused sick leave in the annuity computation for retirements beginning on or after January 1, 2014.

Suppose Sarah retires with exactly 30 years of actual service and 1,044 hours of unused sick leave.

Her sick leave adds six months to the pension calculation:

30 years + 6 months = 30.5 years

Her pension becomes:

$100,000 × 1% × 30.5 = $30,500 per year

That is:

$2,542 per month

Compared with the pension based on exactly 30 years, the sick leave adds:

$500 per year

or about:

$42 per month

That may not seem dramatic, but it is a lifetime increase. It can also increase the survivor annuity based on the unreduced pension.

Sick Leave Is Valuable, but It Is Not Worth More Than Your Health

Because unused sick leave adds to the pension, employees sometimes become reluctant to use it.

That can go too far.

Sick leave exists to protect employees when they are ill, receiving medical treatment, caring for eligible family members, or dealing with other qualifying circumstances.

Its retirement value is real, but the value of one hour is relatively modest when converted into a pension.

For Sarah, six months of accumulated sick leave added about $42 per month to the gross pension. That is useful, but it should not prevent her from using legitimate sick leave when she needs it.

Step 5: Account for Military Service

Prior military service can significantly increase a FERS pension if the service is eligible and the required deposit is completed.

For post-1956 military service to count in a FERS annuity calculation, the employee generally must make the military service deposit before retiring. OPM advises employees to complete the deposit through their agency before separation.

Consider Mark, another federal employee.

Mark has:

• A $100,000 high-3
• 26 years of civilian FERS service
• 4 years of eligible military service
• A completed military service deposit

Without military credit, Mark’s estimated pension using the 1% formula would be:

$100,000 × 1% × 26 = $26,000 per year

With four years of military service added:

$100,000 × 1% × 30 = $30,000 per year

The military credit increases his pension by:

$4,000 per year

or approximately:

$333 per month

The value of the additional pension can then be compared with the cost of the military deposit.

Employees receiving military retired pay may face additional rules, including situations in which retired pay must be waived before the military service can be used in the civilian annuity calculation. Certain exceptions apply.

Military deposits should be reviewed well before retirement. Waiting until the final months can create unnecessary pressure and processing problems.

Step 6: Account for Part-Time Service

Part-time federal service can count toward retirement eligibility, but the pension calculation may be prorated.

For periods of part-time service after April 6, 1986, OPM generally prorates the annuity to reflect the relationship between the hours actually worked and the hours that would have been worked under a full-time schedule.

This means an employee should not automatically multiply the calendar years of part-time work by the full pension formula and assume every year produces the same benefit as a full-time year.

Part-time retirement computations can become complicated, especially when the employee has a mixture of full-time and part-time service.

Employees with substantial part-time service should request an agency estimate rather than relying only on a basic online formula.

Step 7: Check for an MRA+10 Reduction

An employee can reach Minimum Retirement Age with at least 10 years of service and qualify for an MRA+10 retirement.

But that does not necessarily mean the full calculated pension is payable immediately.

Under MRA+10, the annuity is generally reduced by 5% for each year—or 5/12 of 1% for each full month—the employee is under age 62 when the pension begins. The reduction can be decreased or avoided by postponing the annuity. An employee with at least 20 years can generally avoid the reduction by having the annuity begin at age 60 or later.

Suppose Mark leaves federal service at 57 with:

• A $100,000 high-3
• 20 years of service
• Immediate MRA+10 retirement

His unreduced pension calculation is:

$100,000 × 1% × 20 = $20,000 per year

Because he is five years younger than 62, an immediate pension could be reduced by approximately 25%:

$20,000 × 25% = $5,000 reduction

His reduced pension would be:

$20,000 – $5,000 = $15,000 per year

or:

$1,250 per month

That reduction is generally permanent.

Mark could instead separate at 57 and postpone the pension until age 60. Because he has at least 20 years of service, beginning the annuity at 60 can eliminate the age reduction.

However, he would need another source of income between 57 and 60, and he would need to understand how postponement affects FEHB and FEGLI during that period.

This is why the retirement category must be identified before relying on a pension estimate.

Step 8: Subtract the Survivor Benefit Election

The pension formula produces an unreduced, self-only annuity.

A married federal employee generally must elect the maximum survivor benefit unless the spouse consents to a smaller election.

Under FERS:

• The maximum survivor election reduces the retiree’s annuity by 10% and can provide the surviving spouse with 50% of the unreduced annuity.
• The partial survivor election reduces the retiree’s annuity by 5% and can provide the surviving spouse with 25% of the unreduced annuity.

Return to Sarah’s $30,000 annual pension.

With the maximum survivor election:

$30,000 × 10% = $3,000 annual reduction

Her pension becomes:

$27,000 per year

or:

$2,250 per month

With the partial survivor election:

$30,000 × 5% = $1,500 annual reduction

Her pension becomes:

$28,500 per year

or:

$2,375 per month

With no survivor election, the pension remains $2,500 per month before other deductions, but the spouse would not receive the standard FERS survivor annuity based on Sarah’s retirement election.

This decision should not be made based only on the monthly cost. It may also affect whether a surviving spouse can maintain FEHB coverage after the retiree’s death.

Step 9: Estimate Taxes and Insurance Deductions

Even after calculating the pension and survivor election, Sarah still has not reached her net payment.

All or part of a pension or annuity payment may be taxable. The taxable portion is generally subject to federal income tax withholding, although a portion may be excluded because it represents a recovery of the employee’s previously taxed retirement contributions.

Her payment may also be reduced by:

• FEHB premiums
• FEGLI premiums, if continued
• Dental and vision premiums
• Federal income tax withholding
• State income tax, depending on where she lives
• Other authorized deductions

This is why a $2,500 gross pension should never be entered into a retirement budget as if it were $2,500 of spendable income.

Suppose Sarah elects the maximum survivor benefit, reducing her pension to $2,250 per month.

For illustration, assume another $450 per month is withheld for taxes and insurance.

Her estimated spendable pension becomes:

$2,250 – $450 = $1,800 per month

The $450 is only an example. Sarah’s actual deductions will depend on her tax situation, insurance elections, location, and household income.

But it demonstrates the difference between three important numbers:

Gross unreduced pension: $2,500

Pension after survivor election: $2,250

Illustrative net pension: $1,800

Retirement planning should be built around the third number.

Step 10: Understand How COLAs Affect the Pension

A FERS pension can receive cost-of-living adjustments, but most regular FERS retirees do not begin receiving them until age 62.

Exceptions apply to certain disability retirees, survivor annuitants, and employees retiring under special provisions.

FERS COLAs also do not always match the full increase in inflation.

Under the standard FERS formula:

• If inflation is 2% or less, the COLA generally matches the increase.
• If inflation is more than 2% but no more than 3%, the COLA is generally 2%.
• If inflation is more than 3%, the COLA is generally the inflation increase minus 1 percentage point.

For an employee retiring at 57, that can create a five-year period without regular pension COLAs.

Sarah’s $2,250 pension after the survivor election may remain at the same gross amount until she becomes eligible for a COLA at 62, while groceries, utilities, insurance, travel, and other expenses may rise.

That does not make early retirement a bad decision.

It means the plan should include an inflation bridge.

What the FERS Pension Does Not Include

The FERS basic pension is only one part of federal retirement income.

It does not include:

• TSP withdrawals
• Social Security
• The FERS Special Retirement Supplement
• A spouse’s pension or Social Security
• Investment income
• Rental income
• Part-time employment
• Cash savings

Those income sources should be planned together, but they should not be blended into the pension estimate itself.

For example, Sarah may receive a $2,250 monthly pension after her survivor election and also qualify for an estimated FERS supplement until age 62.

That does not make the pension larger.

It means she has two separate income sources, with different rules and different end dates.

Keeping those sources separate makes it easier to see what changes at age 62, when the supplement generally ends and Social Security becomes available.

Why Your Agency Estimate May Differ From Your Estimate

A personal estimate can be extremely useful, but it may not match the final agency or OPM calculation exactly.

Differences can result from:

• The exact dates and salary rates used in the high-3
• Partial months of service
• Sick leave conversion
• Part-time service proration
• Military deposits
• Refunded retirement deductions
• Deposit or redeposit service
• CSRS component service
• Court orders
• Survivor benefit elections
• An MRA+10 age reduction
• Service records that are incomplete or corrected later

The purpose of a personal estimate is not to replace OPM’s final calculation.

It is to help you understand what drives the number, compare retirement dates, identify missing information, and recognize when an estimate does not make sense.

A Simple FERS Pension Calculation Checklist

To estimate your own pension, gather:

1. Your planned retirement age
2. Your expected retirement date
3. Your high-3 average salary
4. Your actual creditable years and months of service
5. Your unused sick leave balance
6. Any military service and deposit information
7. Any part-time or refunded service
8. The correct 1% or 1.1% multiplier
9. Any MRA+10 reduction
10. Your planned survivor election
11. Estimated tax and insurance deductions

Then calculate the pension in stages:

Stage 1: Unreduced annual pension

High-3 × multiplier × creditable service

Stage 2: Monthly gross pension

Annual pension ÷ 12

Stage 3: Pension after retirement reductions

Subtract any MRA+10 or survivor-benefit reduction

Stage 4: Estimated spendable pension

Subtract taxes, insurance, and other deductions

This staged approach prevents the most common mistake: comparing your monthly expenses to an unreduced annual estimate.

Sarah’s Final Estimate

Sarah began with a simple number:

$2,500 per month

After reviewing the details, she determined:

• High-3: $100,000
• Actual service: 30 years
• Unused sick leave: 1,044 hours, adding 6 months
• Multiplier: 1%
• Pension service: 30.5 years
• Unreduced annual pension: $30,500
• Unreduced monthly pension: approximately $2,542
• Maximum survivor reduction: approximately $254 per month
• Pension after survivor election: approximately $2,288 per month
• Illustrative taxes and insurance: $450 per month
• Estimated spendable pension: approximately $1,838 per month

Her sick leave increased the pension, but the survivor election, taxes, and insurance reduced the amount available for spending.

Sarah’s original $2,500 estimate was not completely wrong.

It was incomplete.

That is the most important lesson.

Bottom Line

The basic FERS pension formula is straightforward:

High-3 average salary × years of creditable service × pension multiplier

But your actual pension depends on much more than those three inputs.

Your retirement age determines whether the multiplier is 1% or 1.1%. Your exact years and months of service affect the calculation. Sick leave and military credit may increase the pension. Part-time work can require proration. MRA+10 can create a permanent reduction. Survivor protection can reduce the pension by 5% or 10%. Taxes and insurance reduce the amount that reaches your bank account.

The most useful pension estimate is not the biggest number on the page.

It is the amount you can realistically expect to spend each month.

Once you know that number, you can begin coordinating your pension with TSP withdrawals, Social Security, the FERS supplement, savings, and the rest of your retirement plan.

That is when the question changes from:

“How much is my FERS pension?”

to:

“Is my complete retirement income enough to support the life I want?”