TSP Mistakes Retirees Make Without Realizing—And How to Stop Making Them

Missy E
November 14, 2025

Key Takeaways

Even small missteps with your TSP can lead to substantial financial consequences in retirement, especially when it comes to withdrawal timing, taxes, and investment choices.
You can avoid many of the most common mistakes by reviewing your TSP strategy annually, understanding RMD rules, and consulting with a licensed professional listed on this website.

The TSP Is Powerful—But It Doesn’t Run on Autopilot

If you’re like many public sector employees, the Thrift Savings Plan (TSP) forms the backbone of your retirement. It likely grew quietly in the background over the years, funded by consistent payroll deductions and government contributions. But now that you’re approaching retirement or already there, the way you manage that account matters more than ever.

TSP isn’t just a savings vehicle—it becomes an income source. The transition from accumulation to distribution is where costly errors often surface. Fortunately, you can sidestep many of these issues once you know what to watch for.

1. Delaying Required Minimum Distributions (RMDs) or Ignoring Them Altogether

You are required to start taking RMDs from your TSP account beginning April 1 following the year you turn 73 (for those reaching 72 after January 1, 2023). Waiting too long or missing an RMD can lead to a steep penalty: 25% of the amount that should have been withdrawn.

What to do now:

Keep track of your birthday and monitor your TSP dashboard or IRS communications.
Work with a licensed professional to coordinate RMDs across your TSP and other retirement accounts.

2. Taking Withdrawals Without a Tax Plan

TSP distributions are subject to federal income tax unless they’re from a Roth balance. Without proper planning, your withdrawals can push you into a higher tax bracket, increase Medicare premiums, and even affect your Social Security taxation.

Avoid this trap by:

Creating a withdrawal strategy that spreads taxable income over several years.
Considering partial Roth conversions before RMDs begin.
Factoring in Medicare IRMAA thresholds when planning withdrawals.

3. Relying Too Heavily on the G Fund in Retirement

The G Fund is often praised for its safety. But relying on it too much in retirement can actually expose you to inflation risk. Its low returns may not keep up with the cost of living over time, eroding your purchasing power.

Instead, aim for:

A diversified mix of TSP funds that match your risk tolerance and time horizon.
Reviewing your asset allocation annually, especially in light of changes to your income needs and inflation.

4. Withdrawing Too Much, Too Soon

Some retirees mistakenly treat their TSP like a checking account, withdrawing large amounts early in retirement. But without pacing withdrawals, you risk draining your account faster than expected.

To protect your longevity risk:

Use the 4% rule or a more conservative withdrawal rate based on current inflation and life expectancy.
Set a written retirement income plan with built-in guardrails for market volatility.

5. Failing to Update TSP Beneficiaries After Major Life Events

Divorce, marriage, or the death of a spouse should prompt immediate updates to your TSP beneficiary designation. Otherwise, your account could end up in the wrong hands, regardless of what your will says.

Stay current by:

Reviewing and updating your beneficiary form after any major personal change.
Logging into your TSP account regularly to confirm that the information on file matches your intentions.

6. Overlooking Roth TSP Withdrawal Rules

While Roth TSP contributions can offer tax-free withdrawals, they only qualify if your first Roth contribution was made at least five years ago and you’re at least age 59½.

To avoid unintended taxes:

Ensure both the age and 5-year rule are satisfied before tapping into Roth balances.
Track your contribution history through TSP statements and tax returns.

7. Assuming TSP Fees Are Always Lower Than Alternatives

TSP is known for its low fees. However, that doesn’t mean it’s always the best place for your money in retirement. Depending on your goals, other accounts may offer greater flexibility or broader investment choices.

Review whether to stay or roll over by evaluating:

Your need for lifetime income options, like annuities or systematic withdrawals.
The investment flexibility and withdrawal rules of IRAs compared to TSP.

8. Ignoring Market Conditions When Planning Withdrawals

If you continue investing in C, S, or I Funds during retirement, withdrawing funds in a down market can lead to sequence of returns risk—which means losses early in retirement can have a compounding negative effect.

Combat this risk by:

Keeping at least one to two years of expenses in stable funds (G or F Fund).
Avoiding large withdrawals from equities during bear markets when possible.

9. Not Using the Installment Option Strategically

TSP allows you to set up automatic monthly, quarterly, or annual withdrawals. However, many retirees choose amounts arbitrarily or too high. Without thoughtful planning, you could erode your principal too quickly or pay unnecessary taxes.

Set up your installments by considering:

Your other sources of income (Social Security, FERS annuity, etc.).
Life expectancy and the required pace of spending.
Whether you should switch from fixed-dollar to life-expectancy-based installments.

10. Forgetting About Inflation

If your withdrawals remain the same year after year, you’ll slowly lose purchasing power. TSP does not automatically adjust installments for inflation unless you change them yourself.

You can offset inflation by:

Periodically increasing your withdrawals to match inflation, especially if your basic needs are covered.
Including inflation-sensitive assets (like equities or TIPS) in your portfolio.

11. Rolling Over TSP Without Considering Loss of Benefits

Rolling over your TSP to an IRA can provide more investment flexibility, but it also means forfeiting features like ultra-low fees, G Fund access, and strong creditor protections.

Make a careful decision by weighing:

The benefits and limitations of TSP versus the receiving account.
Whether you value simplicity, cost-efficiency, and security over broader investment options.

12. Not Reviewing Your Strategy Annually

Life changes. So does inflation, tax policy, and your personal goals. Sticking with a “set it and forget it” approach to TSP withdrawals can result in missed opportunities or growing financial inefficiencies.

Build a routine to:

Revisit your TSP withdrawal strategy once a year.
Adjust for life events, new tax brackets, or market shifts.
Confirm your TSP is still aligned with your long-term retirement income needs.

A Smarter TSP Plan Starts With Awareness

Retirement doesn’t mean your financial work is done. The TSP remains a critical part of your income, tax planning, and long-term financial security. Every decision you make about it—from withdrawals and investments to beneficiaries and RMDs—carries consequences.

Make this the year you review your entire TSP strategy. Get help where needed. And most importantly, stay proactive.

For tailored retirement income planning advice, reach out to a licensed professional listed on this website who understands how public sector benefits interact with your TSP.