Retirement Tax Planning for Federal Employees: Keep More of Your Money

The Retirement Tax Surprise

A typical federal retiree drawing a Federal Employees Retirement System (FERS) annuity, traditional Thrift Savings Plan (TSP) withdrawals, and Social Security will face a marginal federal income tax bracket of 22% or higher, keeping their tax liability at or near their working-years levels. This fact catches many federal employees off guard. The default assumption is that you will automatically drop into a lower bracket once you stop working. For private-sector employees who rely solely on a 401(k), that may be true. For federal employees, it rarely is.

Your retirement benefits consist of three distinct, taxable income streams: your FERS pension, your TSP distributions, and your Social Security benefits. These income streams stack on top of each other. Once you add Required Minimum Distributions (RMDs) and Medicare surcharges, you can easily end up paying as much in taxes as you did during your career.

This is the final post in our eleven-part series on federal retirement. The previous posts analyzed specific pitfalls: early TSP withdrawal tax bracket stacking, survivor benefits, and Social Security timing. This post coordinates those pieces. Understanding how these retirement income streams interact — and taking action while you are still working — is the highest-impact financial move available to you.

How Your Three Income Streams Are Actually Taxed

Your FERS Annuity: Mostly Taxable

Your FERS pension is not tax-free. The vast majority of your monthly check represents ordinary taxable income.

During your career, you paid into FERS using after-tax dollars. You are allowed to recover those specific contributions tax-free in retirement. However, these employee contributions are small compared to the total lifetime value of your pension. FERS employees contributed 0.8%, 3.1%, or 4.4% of their base salary depending on their hire date. Your agency and investment growth funded the rest of the pension. That portion has never been taxed.

The IRS uses the Simplified Method (detailed in IRS Publication 721) to calculate your tax-free recovery. Office of Personnel Management (OPM) divides your lifetime after-tax contributions by a life-expectancy factor based on your retirement age. For most FERS retirees, this yields a tax-free exclusion of only $50 to $200 per month. On a $3,000 monthly annuity, that is a tiny fraction. Once you recover your total contributions (often in just a few years), your annuity becomes 100% taxable.

TSP Traditional Withdrawals: 100% Taxable

If you save in a traditional, pre-tax TSP, every dollar you withdraw is taxed as ordinary income, as governed by IRS Publication 575.

Traditional TSP withdrawals are not taxed in isolation. They stack on top of your FERS annuity. A retiree receiving a $30,000 annuity who withdraws $20,000 from the traditional TSP has $50,000 in gross ordinary income before factoring in Social Security.

• The Roth TSP alternative: If you contribute to the Roth TSP, your qualified distributions are completely tax-free. You pay taxes on the contributions today, but the principal and the compounding growth are yours to keep in retirement without owing a dime to the IRS.

Social Security: Up to 85% Taxable

Many federal employees believe Social Security is tax-free. In reality, if you receive a FERS annuity and TSP withdrawals, up to 85% of your Social Security benefits will be federally taxable (see Social Security Administration (SSA) FAQ and the SSA Actuarial Page).

The IRS uses your "combined income" (or provisional income) to determine how much of your benefit is taxable:

Combined Income = Adjusted Gross Income (excluding Social Security) + Tax-Exempt Interest + 50% of Social Security Benefits

The thresholds are low:

• Single filers: Combined income between $25,000 and $34,000 triggers tax on up to 50% of benefits. Combined income over $34,000 triggers tax on up to 85%.
• Married filing jointly: Combined income between $32,000 and $44,000 triggers tax on up to 50% of benefits. Combined income over $44,000 triggers tax on up to 85%.

These thresholds have not changed since 1994. Because they do not adjust for inflation, they capture almost every federal retiree who has a full career of pension and TSP income.

A Worked Example: The Real Tax Picture

Consider a retiree named Sandra. She retired at age 62 after 28 years of service, with a High-3 average salary of $85,000. Her annual retirement income consists of:

• FERS Annuity (1% × 28 × $85,000): $23,800
• Traditional TSP Distributions: $18,000
• Social Security (claimed at 62): $16,800
• Gross Total: $58,600

Here is how the IRS calculates her taxable income:

• Taxable Annuity: $22,600 (assuming a $1,200 annual tax-free recovery exclusion).
• Taxable TSP: $18,000.
• Combined Income: Sandra's combined income is $49,000 ($22,600 + $18,000 + $8,400). This puts her well past the $34,000 threshold for single filers, meaning 85% of her Social Security ($14,280) is taxable.
• Total Taxable Income: $22,600 + $18,000 + $14,280 = $54,880.

After applying the 2026 single standard deduction of $16,100, Sandra's taxable income is $38,780. This puts her in the 22% marginal federal tax bracket.

Her effective federal tax rate on her gross income is roughly 13% to 15%. However, her marginal rate is 22%. This means every additional dollar Sandra withdraws from her traditional TSP is taxed at 22%. If she had saved in a Roth TSP, she could have taken tax-free withdrawals, kept her combined income lower, and paid less tax on her Social Security.

The Hidden Landmines: Income-Related Monthly Adjustment Amount (IRMAA) and Required Minimum Distributions

Medicare IRMAA Surcharges

Federal retirees who keep their Federal Employees Health Benefits (FEHB) and enroll in Medicare Part B at 65 face a base premium of $202.90 per month in 2026 (see Medicare.gov's 2026 Medicare Costs booklet). If your income exceeds specific thresholds, you must pay the Income-Related Monthly Adjustment Amount (IRMAA) surcharge (see our guide on IRMAA medicare tax brackets).

In 2026, IRMAA surcharges begin at $109,000 for single filers and $218,000 for married joint filers. These surcharges increase your Part B and Part D premiums based on your Modified Adjusted Gross Income (MAGI) from two years prior. A large TSP withdrawal or Roth conversion today can raise your Medicare premiums two years from now.

Required Minimum Distributions (RMDs)

Under federal law, you must begin taking annual RMDs from your traditional TSP and IRAs. This requirement begins on April 1 of the year after you turn 73 (or age 75 if you were born in 1960 or later), as outlined in the IRS Required Minimum Distribution (RMD) FAQs.

The IRS forces you to withdraw a percentage of your pre-tax accounts each year based on your life expectancy. For example, at age 73, you must withdraw roughly 3.8% of your balance.

If you have a $600,000 traditional TSP, your first mandatory distribution will be about $22,640. This is taxable income. It sits on top of your annuity and Social Security, potentially pushing you into a higher tax bracket and triggering Medicare IRMAA surcharges.

The Widow's Tax Penalty

A tax plan that works for a married couple can fail when the first spouse passes away. The surviving spouse faces a combination of reduced income and higher tax rates.

Upon the death of a spouse:

• One Social Security check is lost. The survivor keeps only the larger of the two benefits.
• The FERS annuity decreases. Depending on your retirement election, the survivor receives only 50% or 25% of the retiree's annuity.
• Filing status changes to Single. The standard deduction drops from $32,300 (2026 married filing jointly) to $16,150. The tax brackets compress. Income that was safely in the 12% bracket for a couple can jump into the 22% bracket for a single filer.
• IRMAA thresholds are cut in half. The single IRMAA limit is $109,000 compared to $218,000 for a married couple.
• TSP withdrawal pressure rises. To replace the lost Social Security and pension income, the survivor must take larger TSP withdrawals, which increases taxable income.

You must model your tax plan for both joint life and survivor scenarios. Building Roth assets and choosing spousal survivor benefits help protect the surviving spouse from this penalty.

Withholding Coordination: Avoiding the April Surprise

Federal retirees receive income from multiple sources. Each source withholds taxes independently, which often leads to underwithholding.

• OPM Annuity: OPM withholds taxes based on the instructions you provide at retirement. You can adjust this withholding online.
• TSP Distributions: The TSP withholds a flat 10% on monthly withdrawals and 20% on rollovers. This rarely reflects your actual tax bracket.
• Social Security: The Social Security Administration withholds zero taxes by default. You must submit Form W-4V to request withholding.
• State Taxes: The TSP does not withhold state taxes. If your state taxes TSP distributions, you must make estimated payments.

To avoid penalties and large tax bills in April, calculate your total tax liability and adjust your OPM and Social Security withholding to cover the difference.

State Taxes: The Final Layer

Your tax planning is incomplete if you ignore state taxes. Some states exempt public pensions entirely, while others tax them as ordinary income. TSP distributions may be treated as ordinary income even in states that exempt FERS pensions.

If you are considering relocating, analyze the tax rules of your destination state first. Moving to a tax-friendly state can save you thousands of dollars annually on the exact same FERS pension check. Read our guide on state tax treatment of federal pensions for details.

Four Strategies to Lower Your Retirement Tax Bill

1. Start Contributing to the Roth TSP Now

The simplest way to reduce your retirement tax bill is to use the Roth TSP. The 2026 elective deferral limit is $24,500, plus an $8,000 catch-up contribution for employees aged 50 and older.

Paying tax on your contributions today allows the principal and compounding interest to grow tax-free. Roth TSP withdrawals do not count toward your Adjusted Gross Income (AGI). This means they will not increase your Social Security taxes, raise your Medicare premiums, or trigger RMDs.

2. Execute Roth Conversions in the "Gap Years"

The years between your retirement and the start of your RMDs (age 73) and Social Security represent a tax planning window. If your income drops temporarily, you can convert traditional TSP funds to a Roth account at lower tax rates.

Beginning in January 2026, the TSP allows in-plan Roth conversions. You can convert traditional TSP balances to Roth balances directly inside the plan, up to 26 times per year, without rolling the funds to an IRA.

Convert just enough traditional funds each year to fill your current marginal tax bracket without crossing into the next tier. Pay the conversion tax using cash outside your retirement accounts to keep as much money as possible in the tax-free Roth account.

3. Tax-Efficient Withdrawal Sequencing

Draw down your accounts in a sequence that minimizes your lifetime tax liability:

1. First: Spend taxable brokerage accounts (which enjoy lower capital gains tax rates).

2. Second: Withdraw from traditional TSP and IRAs (ordinary income, which you can control).

3. Last: Use Roth TSP and Roth IRAs (which compound tax-free and have no RMDs).

4. Qualified Charitable Distributions (QCDs)

If you are 70½ or older, a Qualified Charitable Distribution (QCD) allows you to send up to $111,000 directly from an IRA to a qualified charity in 2026. This distribution is excluded from your AGI.

A QCD satisfies your RMD requirements without increasing your taxable income, preserving your Social Security benefits and protecting you from IRMAA.

Note that you cannot execute a QCD directly from the TSP. You must first roll your traditional TSP funds into a traditional IRA, then instruct the custodian to send the check directly to the charity.

Frequently Asked Questions

Is my FERS annuity fully taxable?

Almost entirely. OPM calculates a small tax-free monthly exclusion under the Simplified Method to return your after-tax contributions. This exclusion is typically less than $200 per month. Once you recover your contributions, your pension is fully taxable.

When do TSP withdrawals become taxable?

Traditional TSP withdrawals are taxable in the year you receive them. Roth TSP distributions are completely tax-free if you meet the age and holding-period requirements.

How much of my Social Security will be taxed in retirement?

Most career federal employees will pay taxes on 85% of their Social Security benefits. This happens because your annuity and TSP withdrawals push your combined income past the $34,000 (single) or $44,000 (married) tax thresholds.

What is IRMAA and how can I avoid it?

IRMAA is a Medicare premium surcharge for higher-income retirees. In 2026, it begins at $109,000 for single filers and $218,000 for married joint filers. You can avoid or reduce IRMAA by using Roth accounts, utilizing QCDs, and managing the timing of your TSP withdrawals.

When do I have to start taking RMDs from my TSP?

If you were born between 1951 and 1959, you must begin taking RMDs by April 1 of the year following your 73rd birthday. If you were born in 1960 or later, RMDs begin at age 75. Failure to take your RMD results in a 25% excise tax on the amount you did not withdraw.

Plan While You Are Still Working

Strategies like Roth TSP contributions, gap-year conversions, and withdrawal sequencing are far more effective when started before you retire. Planning early can save you $50,000 to $100,000 in lifetime taxes.

Your federal benefits are generous, but the tax burden is real. The retirees who keep the most of their income are those who understand the tax code and adjust their savings strategy while they still have time to act.

Start Your Tax Plan Today — With a Free PSR Report

We design the Pay Stub Review (PSR) to serve as the starting point for every serious federal retirement tax plan. We translate your OPM records, TSP balance, Social Security estimate, and FEHB coverage into a clear, side-by-side picture of what your retirement actually looks like — including what you will owe.

It is free and personalized. For most federal employees, it is the first time they have ever seen their full retirement income picture on a single page.

Contact us today to schedule your free PSR. Our team is based in North Augusta, SC and specializes exclusively in federal employee benefits. We provide this with no obligation — just clarity, before it is too late to do anything about it.

📞 (706) 407-2744

🌐 www.FederalBenefitsExchange.com

📍 332 Edgefield Rd, North Augusta, SC 29841

This article is provided for educational and informational purposes only. It does not constitute tax advice, legal advice, or financial planning advice. Tax laws and benefit rules are subject to change. Federal employees should consult a qualified tax professional, CPA, or financial advisor regarding their individual circumstances before making decisions about retirement income, TSP contributions, Roth conversions, or any other tax-related strategy. Federal Benefits Exchange is an insurance and benefits education company and does not provide tax or legal services.