Working overtime can put more money in your pocket today, but it doesn’t necessarily put more money into your future FERS pension.
That’s because FERS generally calculates your retirement annuity using your high-3 average basic pay, not your total compensation. Overtime and many other forms of premium pay typically don’t count toward that calculation.
More Overtime Doesn’t Usually Mean a Higher High-3
Your FERS pension is generally based on your highest three consecutive years of basic pay. The important word here is basic.
Overtime, bonuses, awards and most other types of premium pay generally aren’t included in the basic pay used to calculate your high-3.
That means an employee could work substantial overtime for several years, earn considerably more than their base salary suggests and still see no increase in the salary figure used for their FERS pension calculation.
In other words, a bigger paycheck doesn’t automatically translate into a bigger FERS pension.
Your Social Security Benefit Is Different
This is where overtime can have a different impact.
Social Security looks at your covered earnings rather than your FERS high-3. Your retirement benefit is based on your highest 35 years of indexed earnings.
If overtime pushes your Social Security-covered earnings high enough to replace a lower-earning year in your record, it could increase your eventual Social Security benefit.
But Social Security has an annual taxable maximum. For 2026, that limit is $184,500. Once your covered earnings reach that amount, additional earnings—including overtime—don’t increase the earnings used for Social Security purposes that year.
So the same overtime that does nothing for your FERS pension could potentially improve your Social Security benefit.
What About Special Retirement Categories?
Some federal employees, including qualifying law enforcement officers, firefighters and air traffic controllers, are subject to special FERS retirement rules.
For employees who qualify, the pension formula is generally more generous for their first 20 years of qualifying service, using a 1.7% multiplier rather than the standard 1% or 1.1% formula.
But the higher multiplier doesn’t generally change the underlying rule about overtime: overtime generally isn’t included in the high-3 basic pay calculation.
So, Did Your Overtime Help Your Retirement?
It depends on which benefit you’re looking at.
Your overtime may not have increased your FERS pension at all. But if those additional earnings were subject to Social Security taxes and helped replace a lower-earning year in your 35-year earnings history, they could still have value when it comes to Social Security.
That’s why it’s worth looking at your federal retirement benefits as a whole rather than assuming every dollar of compensation affects every benefit the same way.
Your FERS pension, Social Security, and TSP each follow different rules. A Federal Retirement Consultant (FRC®) can help you understand how those benefits fit together and what they could mean for your retirement income.
