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Missing These Retirement Tax Rules Could Leave Public Sector Workers With Unexpected IRS Bills

Missy E
November 14, 2025

Key Takeaways

Failing to understand the tax rules that apply to your public sector retirement benefits in 2025 could result in steep, unexpected IRS penalties.
Required Minimum Distributions (RMDs), TSP withdrawals, pension taxation, and Roth conversions all come with unique timelines and rules—each requiring strategic planning to avoid excess taxes.

The Tax Landscape for Retiring Public Sector Workers in 2025

in retirement don’t disappear. In fact, they often become more complicated—especially for public sector workers who rely on multiple sources of income such as pensions, the Thrift Savings Plan (TSP), and Social Security. Overlooking these tax rules in 2025 can lead to unintended tax bills, IRS penalties, or reduced net retirement income.

Let’s explore the most common tax pitfalls and what you need to do now to protect your future income.

Your Pension Is Taxable—But Not All At Once

If you’re a FERS or CSRS retiree, your monthly annuity is generally taxable as ordinary income. However, only the portion representing your employer’s contribution and any interest earnings is taxed.

FERS Pension: The employee contributions are made post-tax, so a small portion of your monthly check is non-taxable. The rest is taxable.
CSRS Pension: You likely contributed more of your own after-tax dollars, meaning a greater share of your annuity is non-taxable compared to FERS.

Key Rule: Use the IRS Simplified Method to determine the taxable portion of your annuity. Failure to calculate this properly could result in overpayment of taxes or scrutiny in an IRS audit.

Required Minimum Distributions Are Now at Age 73

As of 2025, if you turned 73 this year or earlier and have a traditional TSP or other pre-tax retirement account, you must start taking Required Minimum Distributions (RMDs). This is mandatory and enforced with severe penalties.

Deadline: Your first RMD must be taken by April 1 of the year after you turn 73. Subsequent RMDs are due by December 31 every year after.
Penalty: Missing an RMD results in a 25% excise tax on the amount you failed to withdraw. This drops to 10% only if corrected within two years.

Even if you don’t need the money, you must take the withdrawal and report it as taxable income for the year it’s received.

Your TSP Withdrawals Are Fully Taxable

Withdrawals from a traditional TSP account are subject to ordinary income tax, as none of the contributions or earnings were taxed when they went in. Many retirees underestimate how much these distributions can bump them into a higher tax bracket.

Strategies to Consider:

Withdraw strategically: Spread out your TSP withdrawals over time to manage tax brackets.
Use Roth conversions early: Before RMDs begin, convert part of your traditional TSP to a Roth IRA to create future tax-free income (but more on this below).

Social Security Could Be Taxable Based on Your Income

Many public sector retirees are surprised to learn that their Social Security benefits may be taxed—especially if they also draw a pension and take TSP distributions.

Thresholds in 2025: If your combined income (including 50% of Social Security plus other income) exceeds $25,000 for single filers or $32,000 for joint filers, up to 85% of your benefits may be taxable.
GPO Still Applies: If you’re receiving a CSRS pension and applying for Social Security spousal or survivor benefits, the Government Pension Offset (GPO) can reduce or eliminate those benefits.

Roth Conversions Require Timing and Precision

Roth IRA conversions can reduce future tax burdens, but in 2025, they require careful attention to income levels, Medicare premiums, and RMD deadlines.

No RMDs for Roth IRAs: Unlike traditional TSPs or IRAs, Roth IRAs are not subject to RMDs, making them attractive long-term.
Taxable Event: The year you convert is the year you must report the full amount as income.
IRMAA Thresholds: If a Roth conversion increases your income, it could raise your Medicare premiums for two years, depending on your Modified Adjusted Gross Income (MAGI).

Best Time: Consider conversions between retirement and age 73 (before RMDs start), when your income may be temporarily lower.

Watch Out for State Tax Rules Too

Federal taxes are only part of the story. Many states tax public pensions and TSP withdrawals differently.

Some states exempt public pensions entirely.
Others provide partial exemptions.
A few states tax all retirement income without exception.

Review your current or planned state of residence’s tax treatment for:

FERS and CSRS annuities
TSP distributions
Social Security benefits

This can significantly affect your net income and relocation decisions.

Lump-Sum Payments and Annual Leave Payouts

If you retire mid-year, you may receive a lump-sum payout for unused annual leave. This is considered income in the year it is paid—even if it technically covers time after your retirement date.

What to Know:

A large lump-sum payout can push you into a higher tax bracket.
You may also owe more in Medicare IRMAA or lose eligibility for certain deductions or credits.

Plan your retirement date carefully to avoid having a large payout occur in the same year as a pension or Roth conversion.

Timing of Withdrawals Can Affect Health Coverage

If you coordinate your health coverage with Medicare and FEHB or PSHB, your taxable income may impact your healthcare costs. Specifically:

Higher income could increase your Medicare Part B premiums due to IRMAA.
Some PSHB plans offer Part B premium reimbursements—but only if you meet eligibility criteria, including Medicare enrollment.

Keep these thresholds in mind when planning TSP withdrawals or conversions:

IRMAA kicks in at: $103,000 for individuals and $206,000 for married couples filing jointly in 2025.

Survivor Benefits and Tax Considerations

If you elect a survivor benefit for your spouse as part of your pension, it reduces your monthly annuity but provides continued income to your surviving spouse.

Taxable to the survivor: Your spouse will pay income tax on survivor benefits they receive.
Planning ahead: Make sure your spouse understands the tax implications so there are no surprises if they outlive you.

Additionally, life insurance proceeds from FEGLI are generally not taxable, but interest earned on delayed payouts may be.

Charitable Giving Can Help Offset Taxes

For retirees subject to RMDs, using a Qualified Charitable Distribution (QCD) strategy can reduce taxable income. QCDs allow you to transfer up to $100,000 per year directly from an IRA to a qualified charity.

QCDs count toward your RMD.
The amount is excluded from your taxable income.
You must be at least 70½ at the time of the distribution.

TSP participants must first roll funds into a traditional IRA to use this strategy, as TSP doesn’t allow QCDs directly.

Get Ahead of IRS Mistakes Before They Happen

Public sector retirees are often managing multiple streams of income: annuity, TSP, Social Security, taxable brokerage accounts, and more. The IRS doesn’t do the coordination for you. You’re responsible for:

Withholding the correct tax amount from each source
Making estimated tax payments if needed (especially if you delay Social Security)
Reporting all distributions and conversions correctly on your tax return

Failing to plan ahead can cause underpayment penalties, especially if you underestimate your annual tax liability.

Strategic Tax Planning Protects What You’ve Earned

You’ve worked for decades earning your pension, saving in the TSP, and qualifying for federal benefits. But the IRS won’t give you a pass if you don’t follow the rules. That’s why understanding these retirement tax obligations in 2025 is not optional—it’s essential.

Make sure your withdrawal plans, conversion strategies, and survivor elections are reviewed yearly.

If you’re unsure where to start or want help reviewing your situation, get in touch with a licensed agent listed on this website for personalized guidance and tax-smart retirement planning.