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Think You Know Your High-3 Salary? Why Miscalculating It Could Shrink Your Future Pension

Missy E
November 14, 2025

Key Takeaways

Your FERS or CSRS pension relies heavily on an accurate calculation of your High-3 salary average. Small miscalculations can lead to long-term reductions in your retirement income.
Understanding what counts toward your High-3 and what doesn’t—especially in 2025 with evolving compensation structures—is critical to maximizing your pension.

What Is the High-3 Salary Average?

Your High-3 salary average is the cornerstone of your FERS or CSRS pension calculation. It refers to the highest average basic pay you earned during any consecutive three years of federal service. This three-year window doesn’t have to be calendar years or even at the end of your career—but it often is.

Basic pay includes:

Base salary
Special pay (like law enforcement availability pay or firefighter differential)
Within-grade increases

It does not include:

Bonuses
Overtime
Awards
Travel reimbursements
Non-basic allowances

This is why understanding the boundaries of what is and isn’t included in your High-3 is so crucial.

Why It Matters More Than You Think

In 2025, with average annuities for FERS retirees around $1,810 per month and CSRS retirees receiving higher but less common benefits, even a small miscalculation in your High-3 can ripple through your entire retirement.

A $1,000 discrepancy in your annual High-3 salary average could mean losing tens of dollars monthly from your annuity, potentially reducing lifetime income by thousands of dollars—especially if you retire early or live longer than expected.

How Your High-3 Is Used in Pension Calculations

For FERS, the basic formula is:

High-3 Salary Average x Years of Creditable Service x Multiplier

Where the multiplier is typically:

1% for most employees
1.1% if you retire at age 62 or later with at least 20 years of service

For CSRS, the formula is more progressive, with different percentages applied to different ranges of your High-3, generally resulting in a more generous pension for long-time employees.

Common Missteps That Lead to Undervalued High-3 Calculations

1. Assuming Bonuses Count

Bonuses and awards are not considered part of your basic pay, so even if you had a year with a large performance bonus, it won’t count toward your High-3.

2. Ignoring Temporary Promotions

Temporary promotions do count—if they meet certain criteria. If you served in a higher-grade position for an extended period, that pay can be included in your High-3. However, short-term or intermittent promotions may not qualify.

3. Overlooking Part-Time and Intermittent Service

Time spent in part-time roles can significantly affect the calculation. The Office of Personnel Management (OPM) uses a prorated approach to credit service time for part-time work, which can lower your final pension if not properly documented.

4. Misunderstanding Pay Adjustments

Locality pay does count toward your basic pay and therefore influences your High-3. But other extras, like travel stipends or non-taxable housing allowances, do not.

5. Relying on Agency Estimates Without Double-Checking

Agencies often provide unofficial High-3 estimates. Inaccuracies in these figures can linger into retirement if you don’t review them. Always validate your earnings record with your SF-50s and LES (Leave and Earnings Statements).

When to Start Tracking Your High-3

Ideally, start monitoring your pay history and SF-50s five to ten years before your planned retirement date. This allows enough time to:

Clarify which years produce the highest basic pay average
Verify promotions and pay changes are properly documented
Take action if a temporary promotion could push your High-3 higher

In 2025, retirement planning tools have improved, but human error and interpretation still require your careful oversight.

Timing and Its Impact on Your High-3

Let’s say your highest earnings occurred in 2021–2023, but you’re retiring in 2025. You may still use that earlier period for your High-3 calculation if it yields the best result. However, keep in mind:

The three years must be consecutive
They must reflect actual service
Unused sick leave can add to your service time but does not affect the High-3 calculation itself

If you’re delaying retirement to earn a higher High-3, make sure your new salary offsets the months or years it replaces in your earlier high-earning period.

What You Can Do Right Now

In 2025, digital access to earnings data, SF-50s, and official retirement estimates makes it easier than ever to take control. Here’s what you can do:

Request a retirement estimate from your HR office or shared service center
Pull your SF-50s to confirm grade and step history
Track locality and special pay inclusions in your basic pay
Use an OPM-approved calculator to experiment with different retirement dates and salary scenarios
Keep a personal copy of your LES history—even if you’ve left a previous agency

What Happens If Your High-3 Was Calculated Incorrectly?

If you suspect an error after retirement, you can request a recalculation. OPM will review your claim and documentation. If they confirm a higher High-3, your monthly annuity will be adjusted retroactively. However, this process may take several months to a year, depending on documentation and complexity.

It’s far easier—and faster—to ensure accuracy before you retire.

The Role of HR and Your Responsibilities

HR offices are trained to assist, but the ultimate responsibility lies with you. You’re the one who benefits—or loses—based on how accurate your High-3 calculation is. Many retirees only discover miscalculations after their annuity has been finalized.

Being proactive ensures:

Proper service time is credited
Promotions and reassignments are properly reflected
Gaps or breaks in service are accounted for

Don’t Confuse the High-3 With Other Figures

Your High-3 is not your:

Final annual salary
Highest single paycheck
Cumulative average of all earnings over your career

In fact, it’s possible for a retiree to have a lower final salary than their High-3, especially if they accept a lower-paying position near retirement.

High-3 Strategies to Consider in 2025

If you’re planning your exit now, think strategically:

Maximize your grade and step increases several years before retirement
Pursue extended temporary promotions to boost your basic pay
Avoid voluntary demotions unless absolutely necessary
Check how locality pay changes based on location transfers

Also, don’t assume your High-3 is set in stone once you’re in your final year. You can still influence it, even in the short term, with the right actions.

Final Thoughts on Safeguarding Your Pension’s Foundation

Your pension is only as strong as your High-3 calculation is accurate. Misunderstanding what’s included—or failing to review the numbers—can shrink your annuity for life. By starting early, checking your records, and understanding how your pay fits into the bigger picture, you can retire with confidence in the benefit you’ve earned.

Make sure you get professional help if needed. You can connect with a licensed agent listed on this website to get personalized guidance.