If You’re Not Strategizing Taxes in Retirement, You Could Be Handing More to the IRS Than Necessary

Missy E
November 14, 2025

Key Takeaways

Without a proactive tax strategy, your retirement income could be reduced by thousands annually due to avoidable taxation on pensions, Social Security, and investment withdrawals.
Public sector retirees must carefully coordinate FERS, TSP, and Social Security distributions to stay within favorable tax brackets and avoid costly penalties.

The Overlooked Tax Burden in Retirement

You may assume that taxes become simpler in retirement—fewer forms, fewer surprises, and fewer obligations. Unfortunately, that assumption can lead to real financial setbacks. In 2025, public sector retirees like you are facing increasingly complex tax challenges, especially as retirement income comes from multiple sources.

Federal pensions, Thrift Savings Plan (TSP) withdrawals, Social Security benefits, and even part-time income can combine in ways that unexpectedly push you into higher tax brackets. If you’re not accounting for how these income streams interact, you could be handing over more to the IRS than necessary.

Let’s walk through what you need to know to stay tax-efficient in retirement.

How Retirement Income Is Taxed

Understanding how your income sources are taxed is the foundation of any good strategy. Here’s how the most common streams break down in 2025:

FERS Pension

Your annuity is fully taxable at the federal level, assuming your contributions were made with pre-tax dollars.
State tax treatment varies. Some states exempt a portion or all of your pension.

Thrift Savings Plan (TSP)

Traditional TSP withdrawals are fully taxable as ordinary income.
Roth TSP withdrawals are tax-free if you’re at least age 59½ and the account has been open for at least 5 years.
Required Minimum Distributions (RMDs) begin at age 73 for most retirees.

Social Security

Up to 85% of your benefits may be taxable depending on your combined income.
Combined income = Adjusted Gross Income (AGI) + nontaxable interest + ½ of your Social Security benefits.

Other Income

Part-time work, rental income, and taxable investment gains must also be included when calculating your total tax liability.

The Risk of Tax Bracket Creep

The federal income tax system is progressive, which means your income is taxed in segments. But when multiple retirement income sources are stacked in the same year, your effective tax rate can climb quickly.

In 2025, the IRS tax brackets for married couples filing jointly start at 10% and go up to 37%. If your pension alone puts you close to a bracket threshold, even a small TSP withdrawal or Social Security activation could tip you over the edge.

That’s why the order and timing of how you draw from different accounts matter.

Strategies to Reduce Retirement Tax Exposure

A smart tax strategy is not just about what you earn—it’s about when and how you take your income. Here are several ways you can limit what you owe.

1. Delay Social Security Strategically

Delaying Social Security past your Full Retirement Age (FRA) increases your benefit amount by 8% per year until age 70. But it can also help keep your taxable income lower during early retirement years, especially if you are drawing from tax-deferred accounts like the TSP.

This delay gives you a window to draw down traditional TSP balances while your income is otherwise lower, minimizing the tax impact.

2. Take Advantage of the Roth TSP

If you contributed to the Roth TSP during your working years, you may benefit from tax-free withdrawals in retirement. Using Roth distributions strategically can help you manage taxable income and stay below key thresholds.

In 2025, this is especially useful to avoid:

The 3.8% Medicare surtax on investment income
Higher Medicare Part B and D premiums, which are income-indexed

3. Use the “Tax Planning Window” Between Retirement and RMD Age

If you retire before RMDs begin at age 73, you have a powerful window to convert traditional TSP assets into Roth accounts at a controlled tax cost.

This strategy, called a Roth conversion, allows you to fill up the lower tax brackets in those gap years.
Done right, it can reduce future RMDs and lower your taxable income in your 70s and beyond.

4. Coordinate With Spousal Income

If your spouse is also retired or plans to retire soon, your joint income needs to be carefully coordinated. For example:

Two pensions could easily push you into a higher bracket.
Coordinated Roth withdrawals between spouses can keep total taxable income within a lower threshold.

Carefully planned spousal income strategies can reduce your marginal tax rate and help optimize deductions.

5. Minimize Provisional Income

Because Social Security taxation is based on provisional income, you can lower your tax liability by managing income that counts toward this calculation.

This might include:

Prioritizing Roth or after-tax savings for discretionary expenses
Timing capital gains for tax years where you’re below key thresholds

The Medicare IRMAA Surprise

One overlooked consequence of higher taxable income is the potential for increased Medicare premiums. The Income-Related Monthly Adjustment Amount (IRMAA) applies when your modified adjusted gross income (MAGI) crosses specific thresholds.

In 2025:

The IRMAA kicks in for individuals with MAGI above $106,000 and couples above $212,000 (based on your 2023 tax return).
This can increase your monthly Medicare Part B premium by hundreds of dollars.

Even a one-time large TSP withdrawal or Roth conversion could trigger these higher premiums for a full calendar year. That’s why timing is essential.

Understanding RMD Penalties

Required Minimum Distributions (RMDs) are mandatory after age 73 and are subject to strict IRS oversight.

If you miss an RMD or don’t take the full amount, you could face a penalty of 25% of the amount not withdrawn.
You can request a reduction to 10% if corrected promptly, but it’s not guaranteed.

To avoid this, keep a withdrawal calendar and work with a professional to confirm calculations. If you have multiple traditional retirement accounts, each one may have its own RMD rules unless consolidated.

Timing Your Withdrawals Wisely

The sequence in which you tap your retirement accounts can significantly affect your taxes.

General sequencing rule:

Taxable accounts (brokerage, interest, dividends)
Tax-deferred accounts (traditional TSP, IRA)
Tax-free accounts (Roth TSP, Roth IRA)

This order allows tax-advantaged accounts to grow longer and helps control annual taxable income. However, deviations may be necessary depending on your bracket, income needs, and health expenses.

For example:

If you retire at 62, begin with taxable assets and small TSP withdrawals.
Delay Social Security until 67–70 to allow for Roth conversions during lower-income years.

The Role of State Taxes

Federal tax efficiency is only part of the picture. Where you live in retirement can make a significant difference. Some states:

Fully tax pensions and TSP income
Partially exempt them
Don’t tax retirement income at all

Evaluate not only state income taxes, but also:

Property taxes
Sales taxes
Taxation of Social Security

Relocating solely for tax reasons isn’t always advisable, but if you’re on the fence, it’s worth factoring in.

Common Pitfalls to Avoid

Being aware of these common mistakes can help you take proactive control:

Activating Social Security too early: This can permanently reduce your monthly benefit and lead to higher taxes.
Failing to adjust withholding: Retirees often forget to adjust tax withholding on their pension or TSP withdrawals, leading to large bills at tax time.
Overlooking Medicare implications: Not factoring in IRMAA costs or timing can make healthcare more expensive.
Ignoring Roth conversion limits: Converting too much in one year can bump you into a higher bracket and backfire.
Missing RMD deadlines: As mentioned, these penalties are steep and avoidable.

Taking a Proactive Approach Pays Off

You worked hard to earn your pension, contribute to your TSP, and qualify for Social Security. Now it’s time to make those savings work for you—not for the IRS.

Tax-efficient retirement planning isn’t about beating the system; it’s about understanding it. A well-structured withdrawal plan, strategic use of Roth accounts, and timing your income sources wisely can significantly reduce your long-term tax burden.

This kind of planning doesn’t happen automatically. It requires ongoing review and updates, especially when tax laws or your financial circumstances change.

To build a retirement income plan that keeps more in your pocket, get in touch with a licensed agent on this website for professional advice tailored to your situation.