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The G Fund Seems Stable—But Relying on It Alone Could Leave You Vulnerable Later

Missy E
November 14, 2025

Key Takeaways

The G Fund offers capital preservation, but its low returns may not keep up with inflation in retirement.
Relying solely on the G Fund could increase the risk of outliving your savings, especially during a long retirement.

Why the G Fund Holds Appeal in 2025

If you’re a government employee participating in the Thrift Savings Plan (TSP), you’ve likely heard of the G Fund. In 2025, it continues to attract investors with its promise of safety and stability. It’s the only TSP fund that guarantees the preservation of capital, backed by the U.S. government. It doesn’t lose value, even in a market downturn.

That makes it sound like the perfect solution for a retirement portfolio—but only at first glance.

The G Fund invests in short-term U.S. Treasury securities specially issued to the TSP. It earns a rate of interest similar to long-term Treasury bonds without any risk to principal. However, the trade-off is lower growth, which becomes more evident the longer your retirement lasts.

What the G Fund Delivers—and What It Doesn’t

You may be tempted to shift more of your savings into the G Fund as retirement nears, and for good reason:

No market risk: Your account value won’t fall due to a recession or market volatility.
Government-backed: Securities in the G Fund are backed by the full faith and credit of the U.S. government.
Daily liquidity: You can move money in and out of the G Fund on any business day.

However, here’s what it does not deliver:

Growth potential: Long-term returns from the G Fund tend to be the lowest among the TSP options.
Inflation protection: G Fund earnings often fall below the annual rate of inflation.
Diversification: Solely relying on the G Fund leaves your portfolio unbalanced and heavily conservative.

The Inflation Risk You Might Be Ignoring

In 2025, inflation has moderated compared to the spikes seen in 2022 and 2023, but it’s still a factor you must plan for. If inflation averages 2.5% per year, and your G Fund only earns around 2%, your purchasing power shrinks slowly over time. Over a 20- to 30-year retirement, that can be devastating.

For example:

A 2% return on your savings, with 2.5% inflation, results in a negative real return.
Over 25 years, your money could lose roughly 12% to 15% of its purchasing power.

What looks like a secure investment today could be silently eroding your financial stability tomorrow.

You Could Be Trading One Risk for Another

Many government retirees use the G Fund to avoid market volatility—but doing so exposes them to longevity risk: the possibility of outliving their money. This trade-off is especially dangerous if you’re counting on your TSP to cover a significant portion of your retirement expenses.

While the G Fund avoids short-term losses, it can’t help your account grow fast enough to meet long-term needs. Inflation-adjusted returns over the past decade have hovered just above zero, and in some years dipped below. That’s not enough to support a 25- or 30-year retirement.

When the G Fund Might Still Make Sense

To be clear, the G Fund isn’t bad. It plays a useful role in certain situations:

As a short-term parking place: If you’re within 1-2 years of a major purchase or required minimum distribution (RMD), the G Fund offers a safe place to hold those funds.
For emergency reserves: A portion of your TSP in the G Fund can provide a buffer in market downturns, giving your stock investments time to recover.
For rebalancing strategies: It helps stabilize more aggressive allocations by acting as a fixed-income anchor.

In each of these cases, the G Fund works best as part of a broader allocation, not as your only investment.

What a Balanced Approach Looks Like in 2025

If you’re nearing retirement, consider how you can use the G Fund in combination with other TSP funds. A well-diversified portfolio could look like this:

C Fund (Common Stock Index Investment Fund): For exposure to large U.S. companies.
S Fund (Small Cap Stock Index Investment Fund): For growth from smaller companies.
I Fund (International Stock Index Investment Fund): For international diversification.
F Fund (Fixed Income Investment Fund): For bond market exposure.
G Fund: For capital protection.

By blending these together, you reduce the risk of relying on one type of investment. You create a cushion that can absorb short-term shocks and still grow over the long haul.

Sequence of Returns Risk: A Hidden Threat

One of the biggest dangers in retirement is sequence of returns risk—the risk that a market downturn early in your retirement will impact your ability to sustain withdrawals. The G Fund can help offset this risk if used properly.

Here’s how:

By holding 2–5 years’ worth of withdrawals in the G Fund, you give your riskier investments time to recover during market slumps.
During strong markets, you can refill the G Fund portion using gains from equities.

This strategy preserves your retirement balance and reduces the chance of selling stocks at a loss.

How Relying Solely on the G Fund Can Undermine Your Retirement

Let’s say you’re 62 and planning to retire this year. If you move your entire TSP into the G Fund because you’re afraid of a downturn, several problems arise:

Your account growth may stall: Earnings might not keep up with inflation.
You may need to withdraw more each year: Because your balance isn’t growing, your withdrawals put a bigger dent in your savings.
You could run out of money: Especially if you live into your 80s or 90s.

In short, the G Fund might preserve your money today, but it could jeopardize your security tomorrow.

Managing G Fund Use Through Required Minimum Distributions

In 2025, required minimum distributions (RMDs) from the TSP begin at age 73 for those born in 1951 or later. If you’re managing withdrawals, the G Fund can support your RMD strategy by providing:

Liquidity for annual distributions
A safe option to preserve cash equivalents

However, don’t let RMDs drive your entire allocation. They’re just one piece of the retirement income puzzle. While it’s smart to prepare RMD funds in advance using the G Fund, the rest of your account should still aim for long-term growth.

What to Ask Yourself Before Going All-In on the G Fund

Before defaulting to the G Fund as your primary or only investment, consider these questions:

Have I accounted for 25–30 years of retirement spending?
Am I confident that G Fund returns will outpace inflation?
Do I understand the risks of not including any equity exposure?
Can I manage market volatility with a balanced allocation?

Answering these honestly may shift your thinking. Safety and stability are important, but so is the ability to adapt and grow with rising costs and longer lifespans.

Building Resilience Through TSP Diversification

In 2025, the investment environment still includes unpredictability—elections, global events, inflation surprises, and more. The best way to prepare isn’t hiding from risk but spreading it across different asset classes. That’s where a diversified TSP strategy helps.

The G Fund gives you predictability. Other funds give you growth. Combining both can help you:

Maintain purchasing power
Provide steady income
Weather market downturns
Sustain your account through a longer retirement

Working with a licensed agent can help you evaluate which mix best fits your needs based on your age, goals, and timeline.

A Long Retirement Needs More Than Just Safety

Relying solely on the G Fund might feel comfortable, but comfort isn’t the same as security. A secure retirement balances risk, adapts to inflation, and supports your lifestyle—not just for the next five years, but potentially for the next thirty.

Make sure your plan can evolve as life does. Get professional help if needed. And remember: Your retirement deserves more than short-term safety.

For help reviewing your investment strategy and TSP allocation, consider reaching out to a licensed agent listed on this website for personalized advice tailored to your retirement plan.