High-3 Salary Guide

The High-3 average salary is the average of your highest 36 consecutive months of basic pay during your federal career. It is codified at 5 U.S.C. § 8401(3) for FERS and 5 U.S.C. § 8331(4) for CSRS.

Why does it matter so much? Because a $10,000 difference in your High-3 translates directly into $100 per year of pension (at 1% with 10 years of service) — or $2,000 per year with 20 years of service. Over a 25-year retirement, a $10,000 High-3 gap costs you $50,000 in lifetime pension income.

The High-3 is not your final salary, your highest single year of pay, or your average over your entire career. It is specifically the best rolling 36-month window in your record.

The High-3 is built from basic pay only. The CSRS/FERS Handbook defines basic pay as the rate fixed by applicable law or regulation before any deductions, with specific pay types included or excluded by statute. Many employees are surprised that their large overtime or bonus earnings do not raise their High-3 at all.

You do not have to wait for OPM to tell you your High-3. With your SF-50 history in hand, you can calculate it in 15 minutes. Here is the step-by-step process:

For most employees, the answer is yes — but not always. These scenarios show when the High-3 period may differ from the final 3 calendar years:

The phrase "final 3 years" is often used as shorthand for the High-3, and for most employees it happens to be accurate. But the statute says "highest" — not "final." The difference matters in three situations:

1. Pay cuts late in career

If your basic pay decreases in the final years — because of a voluntary demotion, a move to a lower-paying locality, a reduction to part-time hours, or a reclassification — your actual High-3 may fall in an earlier window. Example: An employee earning $118,000 in the San Francisco locality who transfers to a Rest-of-U.S. position at $95,000 two years before retirement will likely have a High-3 that starts 36 months before the transfer, not 36 months before retirement.

2. Higher-grade temporary assignments

Acting assignments and temporary promotions can raise basic pay during a limited period. If those periods fall within the 36-month window, they raise the High-3. However, unless the temporary assignment lasted long enough to be part of a 36-month continuous period with higher pay, the benefit may be small.

3. End-of-career part-time schedules

Some employees reduce hours near retirement for health, family, or lifestyle reasons. Part-time schedules proportionally reduce basic pay, which can push the High-3 window earlier into the career — before the schedule reduction. If you plan to go part-time in your last year or two, run the numbers first: High-3 Calculator.

The FERS pension formula is simple, and the High-3 is its foundation:

The Dollar Impact of a Higher High-3

Every $10,000 increase in your High-3 adds $100–$330/year to your pension depending on your years of service and multiplier. Over a 25-year retirement, that is $2,500 to $8,250 in additional lifetime income per $10,000 of High-3. This is why the High-3 calculation deserves attention — even a $5,000 error matters.

When you retire, OPM retrieves your Official Personnel Folder from the National Personnel Records Center (NPRC) in St. Louis. Each salary change in your career is documented on an SF-50 (Notification of Personnel Action), which records the effective date, annual rate of basic pay, and pay action type.

OPM's Process

1. Reconstruct salary bands: OPM transcribes every SF-50 into a timeline of pay periods, noting the start date, end date, and daily rate of basic pay for each period.
2. Scan for the highest 36-month window: Starting from the most recent SF-50 and working backward, OPM identifies the 1,095-day window with the highest total basic pay earned.
3. Compute the daily-weighted average: For each candidate window, OPM multiplies each pay rate by the number of days it was in effect, sums the results, and divides by 1,095 to get an average daily rate. The annual High-3 is that daily rate × 365.
4. Document and notify: The computed High-3 appears in your first annuity statement. If you believe it is wrong, you have the right to request reconsideration under 5 C.F.R. Part 841.

Accessing Your eOPF

Federal employees can access their electronic Official Personnel File through their agency's HR portal (usually via MyBiz+ or a similar system). Before you retire, request a printed or electronic copy of all SF-50s and verify the effective dates and salary figures are correct. Correcting an SF-50 error before retirement is far easier than appealing an OPM decision after the fact.

OPM processes hundreds of thousands of retirements per year under significant staffing pressure. Errors happen. The most common High-3 errors fall into five categories: