Understanding the Taxation of Your Federal Retirement Income

You spent decades building a federal retirement package that most workers would envy (a pension, a TSP, Social Security, and a FEHB health plan that follows you into retirement). What a lot of federal employees don't fully reckon with, though, is that the IRS is going to take a meaningful piece of that income.

Understanding how your retirement income is taxed isn't just an academic exercise. It determines how much you actually take home, whether you face unpleasant surprises at tax time, and how much of your own money you actually get to keep. Here's a clear breakdown of how each stream of your federal retirement income is taxed, and what you can do about it.

Your FERS Pension: Mostly Taxable, With One Nuance

Your FERS pension is subject to federal income tax. OPM (the Office of Personnel Management) will withhold federal taxes from your annuity payment each month, similar to how your agency withheld taxes from your paycheck during your working years.

There is one wrinkle worth understanding. Throughout your federal career, you contributed a small percentage of your salary to your FERS pension on an after-tax basis, meaning those contributions were taxed before they went in. That means a very small portion of each pension check represents a return of your already-taxed contributions, not new income. Under what the IRS calls the Simplified Method, OPM calculates this exclusion ratio for you, and a tiny slice of each payment is treated as tax-free. In practice, this exclusion is small, often just a few dollars per month. but it does mean your pension isn't 100% taxable income.

For practical planning purposes, treat your full pension as taxable and let the exclusion be a minor pleasant footnote, not a centerpiece of your tax strategy.

When you retire, you'll file Form W-4P with OPM to set your federal withholding on pension payments. Take this seriously, as under-withholding means a tax bill in April, while over-withholding means you've given the IRS an interest-free loan all year.

CSRS retirees should note that their contributions to the civil service retirement fund were larger. As such, the tax-free exclusion is proportionally more significant. It may be worth running the numbers with a tax professional.

TSP Withdrawals: It Depends on Which Account You Used

Your TSP taxation depends entirely on whether your contributions went into a Traditional (pre-tax) account or a Roth account, and many federal employees have both.

Traditional TSP withdrawals are fully taxable as ordinary income. You deferred the taxes when you contributed and will need to pay them when you take the money out. Every dollar you withdraw from your Traditional TSP in retirement whether as a monthly payment, a partial withdrawal, or a required minimum distribution gets added to your taxable income for that year and taxed at your ordinary income rate.

Roth TSP withdrawals are the opposite. You paid taxes on those contributions up front, so qualified withdrawals in retirement (both the contributions and the earnings) are completely tax-free. To be 'qualified' (and thus tax-free), your Roth TSP must be at least five years old and you must be at least 59½. Meet those two conditions, and that money is yours, free and clear of federal income tax.

When you retire, the TSP will treat any withdrawal as coming proportionally from both your Traditional and Roth balances, unless you roll them into separate IRAs first. Rolling your Traditional TSP into a Traditional IRA and your Roth TSP into a Roth IRA, gives you cleaner control over which dollars you pull and when. This matters a great deal for managing your taxable income and your tax bracket year-to-year.

Also, don't forget Required Minimum Distributions. Once you turn 73 (or 75 depending on when you were born) the IRS requires you to begin withdrawing a minimum amount from your Traditional TSP (and Traditional IRA) each year, whether you need the money or not. These RMDs are taxable income, and ignoring them carries steep penalties. Planning your withdrawals strategically before RMDs kick in, particularly in the years between retirement and age 73(or 75), can meaningfully reduce your lifetime tax bill.

Social Security is Taxed on a Sliding Scale

A lot of retirees are genuinely surprised to learn that Social Security benefits can be taxable. Up to 85% of your benefit can be included in your federal taxable income if you exceed the established thresholds. The exact percentage depends on your 'combined income,' which the IRS defines as your adjusted gross income, plus any non-taxable interest, plus half of your Social Security benefit.

For most federal retirees receiving a pension plus TSP withdrawals, combined income will almost certainly exceed the threshold, meaning up to 85% of Social Security benefits are taxable. To be clear, that doesn't mean you pay 85% tax on your benefit. It means 85% of the benefit is included in your taxable income and taxed at your marginal rate. The distinction matters significantly.

This is another reason that managing your TSP withdrawal strategy thoughtfully is so valuable. Pulling heavily from your Traditional TSP in any given year raises your combined income, which can push more of your Social Security into taxable territory. The result is a compounding effect that careful planning can soften.

State Tax Can Vary Wildly and It’s Worth Your Attention

Federal taxes are one thing. State taxes are another story entirely and can vary so dramatically that geography alone can change your effective retirement tax rate by several percentage points.

A handful of states have no income tax at all. Florida, Texas, Nevada, Washington, Wyoming, South Dakota, Tennessee, and New Hampshire (on earned income) are all on this list. Retiring in any of these states means your pension, TSP withdrawals, and Social Security are not touched by state income tax.

Many other states offer meaningful exemptions for federal retirement income specifically. Some exclude federal pension income entirely. Some exempt a portion of the federal pension income. Other states tax it in full, but have low rates. States with notable federal pension exemptions or favorable treatment include Illinois, Pennsylvania, Mississippi, and Alabama, among others. Several states also offer partial exemptions on Social Security income or exclude it entirely.

On the other end of the spectrum, some states offer little to no special treatment for retirement income and apply their standard income tax rate to everything. If you live in one of these states, your state tax burden in retirement could add several thousand dollars to your annual tax bill.

I’ve included a few practical steps for state tax planning below.

• Check your state's current treatment of federal pension income. Rules change and several states have modified their exemptions in recent years.

• If you're considering relocating in retirement, don't just look at income taxes. Factor in property taxes, sales taxes, and the cost of living as a complete picture.

• If you live in a state that taxes your pension, confirm whether withholding is being taken at the state level through OPM, or whether you'll need to make estimated state tax payments.

The Bigger Picture: Tax Planning Is Retirement Planning

The core insight here is that your gross retirement income and your net retirement income are two very different numbers. Further, the gap between them is largely determined by decisions you make before and during retirement, not just by how much you saved.

Understanding that your pension is mostly taxable, that your Traditional TSP withdrawals are fully taxable, that Social Security can be up to 85% taxable, and that your state may take its own cut, puts you in a position to plan rather than just react. The federal employees who retire most comfortably aren't always the ones who saved the most, but the ones who understood the rules well enough to keep more of what they built.

If you don't have a tax-aware retirement plan that accounts for all four of these income streams, that's the place to start. Contact your Corbett Road Wealth Manager to discuss this further.

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IMPORTANT DISCLOSURES

This post was created with the assistance of AI tools for research and drafting.  It was reviewed, edited, and fact-checked by Will Cunningham before publication.  Please verify any critical information.

These materials are provided for general information and educational purposes based upon publicly available information from sources believed to be reliable—we cannot assure the accuracy or completeness of these materials. The information in these materials may change at any time and without notice.

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