Phased Retirement Sounds Great—Until You Realize It Delays Full Benefit Accrual

Missy E
November 14, 2025

Key Takeaways

Phased retirement can reduce work stress and allow a smoother transition into retirement—but it often delays the full accumulation of benefits like your FERS annuity or TSP growth.
While you still earn partial service credit, your reduced work schedule may impact the high-3 average and slow your total benefit accrual.

What Is Phased Retirement, and Why Do Public Sector Workers Consider It?

Phased retirement allows eligible public sector employees to transition from full-time work to partial retirement by working part-time while beginning to draw a portion of their retirement benefits. As of 2025, federal agencies continue to offer this option for a smoother shift into retirement without the immediate financial and psychological shock of leaving work entirely.

You might consider phased retirement if:

You want to gradually scale back your responsibilities.
You’d like to supplement your income while starting to enjoy retirement.
You aim to mentor junior employees before fully retiring.

While the concept sounds appealing, it comes with trade-offs you must weigh carefully.

Eligibility and Program Structure

Under the current structure, phased retirement is available to certain federal employees covered under FERS or CSRS. To qualify:

You must be eligible for immediate retirement (minimum retirement age with at least 30 years of service, or age 60 with 20 years, under FERS).
You must obtain agency approval.
You must agree to work part-time, generally 50% of your prior full-time schedule.
You must commit to mentoring duties if required by your agency.

Your pay and benefits during phased retirement are based on the part-time work schedule. You receive half of your pension while continuing to accrue additional service credit—albeit at a reduced rate.

The Cost of Delayed Accrual in Your Pension

While you continue to build service credit during phased retirement, it accrues more slowly than if you remained in full-time status. This directly affects your eventual annuity calculation.

For FERS participants, your basic annuity is calculated as: 1% of your high-3 average salary multiplied by your years of service (1.1% if you retire at age 62 or later with at least 20 years of service).

During phased retirement, you:

Receive half of your earned annuity based on service up to the start of phased retirement.
Accrue additional service credit on your part-time hours, not a full-time equivalent.
Face a delayed increase in your total retirement income since part-time service adds less per year.

This means that working part-time for three years under phased retirement could result in the equivalent of only 1.5 years of full-time service credit added to your pension.

The Impact on Your High-3 Average Salary

Another critical consideration is how phased retirement might affect your high-3 average salary—the three consecutive years of highest base pay, used in calculating your annuity.

If your phased retirement earnings fall within your high-3 window, your average may drop:

If your high-3 years haven’t yet occurred, switching to part-time could lower your projected average.
If your high-3 is already locked in from earlier full-time service, the impact is less.

Keep in mind that high-3 is based on base pay, not total compensation, and part-time work can reduce the figures used in this calculation.

Thrift Savings Plan (TSP) Contributions During Phased Retirement

You can still contribute to your TSP account during phased retirement, but your contributions will be based on your reduced salary.

If you reduce to 50% work schedule, your contributions are also halved unless you adjust the percentage manually.
Agency matching continues for FERS employees but is likewise reduced.
The lower your income during phased retirement, the less you’re able to contribute toward your annual IRS contribution limits.

In 2025, the elective deferral limit is $23,500, and the catch-up contribution for those 50 or older is $7,500. Working part-time could make it harder to reach these limits.

Health Benefits and FEHB Continuation

The good news is that you can retain your Federal Employees Health Benefits (FEHB) during phased retirement if you remain eligible:

You must be enrolled in FEHB for the five years preceding retirement.
During phased retirement, you continue to receive the government’s share of the premium.

However, if you choose to extend phased retirement over several years, rising FEHB premiums may consume a larger share of your reduced income.

You’ll also want to consider whether the coordination of FEHB with Medicare Part B will be necessary if you are aged 65 or older during phased retirement. Your costs may increase if you delay Medicare enrollment and later face penalties.

What Happens at Full Retirement?

When you formally end your phased retirement period, your annuity is recalculated to include:

The portion already being paid during phased retirement.
Additional service credit accrued during the part-time work period.
Any increase in your high-3 average salary, if applicable.

The new calculation becomes your full annuity, effective from the day after your separation from phased retirement.

Be aware that the additional annuity from your part-time service is relatively small. A few years of phased retirement won’t significantly boost your total pension compared to working full-time those same years.

Why Some Agencies Are Reluctant to Offer Phased Retirement

Despite being an official program, phased retirement is not mandatory for agencies to offer. Many have yet to implement it or only allow it under specific circumstances.

Reasons include:

Budget constraints
Administrative complexity
Difficulty in redistributing work
Limited interest among managers

Even if you’re eligible, your agency must approve your application. It’s not an automatic right. If your agency doesn’t offer phased retirement, you’ll have to consider alternatives like part-time reemployment after retirement or working under a separate agreement.

Alternatives to Phased Retirement

If phased retirement doesn’t align with your goals—or isn’t offered by your agency—other options can allow you to scale back work without jeopardizing long-term benefits:

Voluntary part-time employment: This doesn’t trigger annuity payments but still allows you to accrue service credit at a prorated rate.
Post-retirement reemployment: You retire fully and return to federal service under a rehire arrangement, though this may affect annuity payments depending on the type of appointment.
Retirement at full eligibility: Some choose to delay retirement entirely until they hit their highest possible benefit thresholds, especially those aiming for the 1.1% FERS multiplier at age 62.

Is Phased Retirement Worth It in 2025?

The decision depends on your financial goals, health, career satisfaction, and retirement timeline.

Phased retirement may be worth considering if:

You want to ease into retirement without a sudden stop.
You’re emotionally ready to step back but still want structured income.
Your agency offers the program and supports your transition.

However, it may not be the best fit if:

You want to maximize your annuity.
Your high-3 average would be diluted by part-time pay.
You need to contribute aggressively to TSP in your final years.

Weighing the Long-Term Impact

Choosing phased retirement isn’t just about working fewer hours—it’s about how those reduced hours affect your retirement income permanently.

Key points to evaluate:

How much service credit you’ll actually gain during phased retirement
Whether your high-3 average could drop
If the additional annuity from your part-time service justifies the time commitment
Whether FEHB costs will strain your part-time income
How it aligns with your TSP savings strategy

If you plan to retire soon after phased retirement begins, the benefit gains may be minimal. But if you extend phased retirement over several years, the delay in reaching your full retirement payout could cost you more than it saves.

How to Think Strategically About Your Retirement Path

Before you agree to phased retirement, take time to map your financial future. Use available tools to project your annuity under full-time versus part-time scenarios. Estimate your TSP growth and model different health coverage costs.

And most importantly—talk to a professional. Getting in touch with a licensed agent listed on this website can help you evaluate whether phased retirement fits into your larger retirement strategy or if you’re better off choosing a more traditional exit from the workforce.