Your High-3 average salary is the single most important number in your FERS pension calculation. A 10% increase in your High-3 produces a 10% increase in your pension — for the rest of your life. Understanding how it works — and how to maximize it — can be worth tens of thousands of dollars.

What Exactly Is the High-3?

The High-3 is the average of your three highest consecutive years of basic pay received while you were a federal employee. Specifically:

  • It is calculated using the total basic pay earned over 78 consecutive bi-weekly pay periods (3 years)
  • “Basic pay” includes your base salary and locality pay, but generally excludes overtime, bonuses, awards, and allowances
  • The three years do not have to be your final three years — they just need to be consecutive

OPM averages the actual pay you received over the 78-period window, not simply the salary rate, so pay periods matter.

Strategies to Maximize Your High-3

1. Time Promotions Carefully

The most powerful lever is getting a promotion in the final three years before retirement. If you can move from GS-12 to GS-13 at year 28 of a 30-year career, that salary increase is captured in your entire High-3 window.

Example: Moving from GS-12 Step 10 (,338) to GS-13 Step 5 (,029) in year 28 adds ,691/year to salary. Over a 3-year High-3, that adds ~,461 to your High-3 average, which adds ~,115/year to your pension (.01 × 25 years × ,461).

Over a 20-year retirement, that one promotion at the right time generates an additional ,300+ in total pension income.

2. Transfer to a Higher Locality Pay Area

Locality pay is included in your basic pay for High-3 purposes. If you can transfer to a high-locality area for your final three years, your High-3 goes up significantly.

A GS-12 Step 8 earning ,982 in “Rest of US” vs. ,854 in San Francisco — a ,872/year difference. After 25 years of service: ,872 × 25 × 1% = ,218/year more pension from that locality transfer.

3. Don’t Leave Early

Every month that passes while your salary is at its peak adds to the High-3 numerator. Retiring even 6 months earlier than planned can reduce your High-3 if your most recent pay rate was your highest.

4. Consider Whether Overtime Counts

For most positions, overtime and bonuses do NOT count toward the High-3. However, availability pay (for criminal investigators) and certain law enforcement premium pay does count. Know your pay components.

5. Verify Step Increases Before You Go

Make sure all pending step increases are processed before your retirement date. A step increase that processes after you retire won’t affect your High-3.

The Sick Leave Multiplier Effect

While not strictly part of the High-3, unused sick leave increases your years of service in the pension formula. More years × the same High-3 = a higher pension. Every 174 hours of unused sick leave adds one month of service.

If your High-3 is ,000 and you add 6 months of service through sick leave: 0.5 years × ,000 × 1% = /year more pension for life.

The Bottom Line

Maximizing your High-3 is the single highest-ROI thing you can do in the final years of your federal career. Strategic promotions, locality transfers, and staying until the right moment can collectively add thousands of dollars per year to your retirement income — permanently.

Use our FERS Calculator to see how different High-3 amounts affect your pension. Try entering your current salary vs. your projected salary after a promotion to see the difference.