TSP and FEGLI Retirement Planning: Coordinating Withdrawals With Insurance Premiums

The Interaction Nobody Models

Federal retirement income planning usually treats the annuity, TSP, and Social Security as three separate streams. FEGLI premiums are treated as a line item — a cost deducted from the annuity, noted once, then largely ignored.

That's a mistake. FEGLI optional premiums don't stay flat — they escalate in five-year age-band jumps. Meanwhile, your annuity grows only by COLA (2.0% for FERS in 2026, 2.8% for CSRS), and TSP withdrawals are governed by your own strategy until RMDs force a minimum pace starting at age 73 for those born in 1951–1958 (or 75 for those born in 1959 or later). These three components interact in ways that compound over time, and the interaction is most painful in the 70–80+ age range when FEGLI Option B premiums are at their peak.

How Premium Drag Works

"Premium drag" is the percentage of your net monthly annuity consumed by FEGLI premiums. It starts manageable and can become severe:

Take a FERS retiree with a $4,000/month gross annuity and $300,000 of Option B coverage at No Reduction:

At age 80+, nearly half the gross annuity goes to one insurance premium. Add FEHB/PSHB, dental, and taxes, and the usable income from the annuity alone may be negligible. This is where TSP becomes the de facto income source — and where the coordination matters.

TSP Withdrawal Strategy Meets Premium Escalation

Most federal retirees plan TSP withdrawals as income supplementation: take enough to cover the gap between annuity + Social Security and desired spending. FEGLI premiums introduce a moving target into that gap.

Pre-65 (ages 57–64). FEGLI premiums are moderate. The annuity covers them with room to spare for most retirees. TSP withdrawals can follow a conservative drawdown plan.

Ages 65–74. Premium jumps accelerate. If you've elected No Reduction on Option B, your annuity's FEGLI drag is increasing faster than COLA raises your annuity. TSP withdrawals start absorbing part of the premium cost.

Ages 75+. Premium drag reaches critical levels. A retiree who planned their TSP withdrawal rate at age 62 based on their annuity shortfall may find they need to withdraw substantially more by 75 — right when they should be protecting their TSP balance against longevity risk.

The RMD Complication

Under SECURE 2.0, Required Minimum Distributions from traditional TSP balances begin at age 73 (for those born 1951–1958) or 75 (born 1959 or later). These withdrawals are mandatory and fully taxable as ordinary income.

The interaction with FEGLI:

RMDs increase your taxable income. At age 73, when your traditional TSP balance might be $600,000–$1,000,000+, your first RMD could be $22,000–$37,000+. This income, added to your annuity and Social Security, can push you into a higher tax bracket.

Higher income triggers IRMAA. If your modified adjusted gross income exceeds the applicable annual threshold, you pay Income-Related Monthly Adjustment Amounts — surcharges on Medicare Part B and Part D premiums.

The compounding effect. At age 75, you could simultaneously face: Option B premiums of $3.90 per $1,000/month, mandatory RMDs that increase your tax bracket, IRMAA surcharges triggered by the combined income, and COLA-adjusted annuity that hasn't kept pace with any of these costs.

This is the cascade that makes FEGLI premium decisions a TSP planning issue, not just an insurance question.

Roth TSP as a Premium Funding Tool

Roth TSP balances are exempt from lifetime RMDs under SECURE 2.0. Withdrawals of contributions and earnings (after meeting the five-year holding and age-59½ requirements) are tax-free. This makes Roth TSP a useful instrument for absorbing FEGLI premium costs without increasing taxable income.

A retiree who has both traditional and Roth TSP balances can strategically draw from the Roth side to fund FEGLI premiums, keeping taxable income below IRMAA thresholds and minimizing the tax bracket impact. This doesn't change the cost of the premiums — it changes the tax efficiency of paying them.

Note the high-earner Roth catch-up mandate: starting in 2026, federal employees whose prior-year FICA wages exceeded $150,000 must direct all catch-up contributions to Roth TSP. For high-earning employees within five years of retirement, this may actually help build a more tax-efficient premium-funding pool for their post-retirement FEGLI costs.

The Practical Framework

Before completing SF 2818, model these scenarios across your full expected retirement horizon:

1. Calculate your total FEGLI premium at each five-year age band through age 85
2. Project your annuity with COLA adjustments at each age band
3. Subtract FEGLI premiums, FEHB/PSHB, and estimated taxes to get usable annuity income
4. Calculate the TSP withdrawal needed to reach your target spending at each age band
5. Check whether those TSP withdrawals, combined with RMDs, trigger IRMAA

If the numbers show that FEGLI Option B at No Reduction would consume an unsustainable share of your income by 75 or 80, that's critical information to have before you make an irrevocable election.

For the complete premium projection tables and the retirement income coordination framework, the FEGLI Retirement Decision Guide provides the structured analysis tools to run this calculation.

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