Proposed Changes to the TSP G Fund Could Affect Millions—Including Conservative Federal Retirees

Missy E
November 14, 2025

Key Takeaways

In 2025, lawmakers are actively considering proposals that would alter the structure and yield calculation of the TSP G Fund, which has long been the most conservative investment option for federal employees and retirees.
If implemented, these changes could reduce the interest earnings of millions of public sector participants, particularly those who rely on the G Fund for low-risk, retirement-stage stability.

What the G Fund Is—and Why It Matters in 2025

The G Fund remains one of the most widely used investment options in the Thrift Savings Plan (TSP). It offers a unique benefit: a government-backed security that provides a rate of return similar to long-term Treasury bonds without the risk of loss in principal.

In 2025, the G Fund continues to be an essential piece of retirement planning for public sector employees, especially those nearing or in retirement. Its stability and interest accrual, even in volatile markets, make it a favorite among conservative investors.

But that stability might not be guaranteed moving forward. Proposed legislation in 2025 could fundamentally change how the G Fund operates—and it could cost conservative retirees significantly over time.

How the G Fund Works Today

As of now, the G Fund invests in non-marketable U.S. Treasury securities specially issued to the TSP. These securities are backed by the full faith and credit of the U.S. government. What makes the G Fund unique is that it earns a long-term interest rate (based on the weighted average of Treasury bonds with maturities of 4 years or more) while carrying no risk of loss in principal.

Key features include:

Daily interest accrual
No risk of loss due to market fluctuations
Historically higher yield than short-term T-bills despite no volatility

This combination makes the G Fund attractive not just to retirees, but also to risk-averse employees who are accumulating retirement savings.

The Proposed Change in 2025: What’s on the Table

A bill introduced in early 2025 is seeking to change the yield calculation method of the G Fund. Instead of linking the return to the average yield of medium- to long-term Treasuries, the proposal would peg it to the returns of short-term (typically 90-day) Treasury bills.

If this legislation passes:

The G Fund would mimic the returns of a money market fund.
Interest rates would become more sensitive to Federal Reserve policy.
Long-term earning potential for G Fund investors could drop significantly.

While the rationale is to reduce government costs tied to the G Fund’s above-market yields, the consequence would be a major reduction in conservative investors’ retirement income over time.

Who Would Be Most Affected

Federal employees and retirees who:

Allocate a significant portion of their TSP to the G Fund
Are retired or nearing retirement and want to avoid market volatility
Use the G Fund for Required Minimum Distributions (RMDs)
Depend on steady, guaranteed returns to preserve principal

In particular, retirees who shifted most of their TSP into the G Fund to protect against market downturns would see reduced growth in their account balances under the proposed model.

How the G Fund Has Performed Historically

Looking back, the G Fund has consistently offered a positive return—even in years of economic downturn or low interest rates. For example, while money market accounts saw yields near 0% in the years following the 2008 financial crisis, the G Fund still offered annual returns in the 2%–3% range.

In 2024, the G Fund returned over 4%—a strong showing that helped offset inflation and market volatility. That kind of performance has made it a bedrock of conservative retirement portfolios.

Under the proposed change, such performance may not be possible moving forward.

What It Could Mean for Your TSP Strategy

If you’re a conservative investor relying heavily on the G Fund, here are some of the risks you need to consider:

Reduced Compounding Over Time: Lower returns year after year can dramatically impact the long-term growth of your savings, even if the principal remains safe.
Loss of Purchasing Power: With inflation projected around 2.5%–3% in 2025, a G Fund yielding 1%–2% would not keep pace, resulting in a slow erosion of your real income.
Forced Reallocation: Some investors may feel compelled to shift into riskier funds (F, C, S, I, or L Funds) in search of higher returns, potentially undermining their original conservative approach.

Considerations for Retirees Already Drawing from the G Fund

If you’re retired and using G Fund withdrawals to meet living expenses or RMDs, the impact of these changes could be immediate. While your account balance won’t decline from market losses, the lower interest credited each month may not be enough to cover planned expenses over time.

This is especially relevant in 2025, as inflation pressures continue and cost-of-living increases in retirement rise across the board.

You may want to:

Reassess your annual withdrawal strategy
Consider diversifying into a more balanced TSP allocation
Speak to a financial professional to evaluate trade-offs

Could This Change Actually Happen?

As of mid-2025, the legislation is still under discussion in Congress. Similar proposals have surfaced in past years but failed to pass. However, with growing concerns about federal deficits and interest costs, there’s renewed momentum.

Key points to monitor:

Congressional Budget Office analysis: Will the proposed savings to the federal budget justify the impact on retirees?
Union and retiree association lobbying: Groups representing federal employees and retirees are pushing back strongly.
Public comment and media scrutiny: As more federal employees become aware of the change, pressure could mount to delay or amend the bill.

While nothing is finalized yet, it’s critical to stay informed and begin evaluating how your retirement plan might adapt.

What Alternatives Do You Have Within the TSP?

If you’re concerned about potential G Fund changes, consider how the other TSP funds could play a supporting role:

F Fund: Offers exposure to government and corporate bonds. Higher yield potential, but some interest rate risk.
L Income Fund: Designed for those already in retirement. Balances safety and growth across all funds.
C, S, I Funds: These are stock-based and carry higher volatility. They are not ideal substitutes for the G Fund but could complement a broader portfolio.

Also worth considering:

Staggering withdrawals across multiple funds
Maintaining some cash reserves outside the TSP to buffer short-term market shocks

Don’t React in Haste—But Don’t Ignore the Issue Either

G Fund changes won’t happen overnight, and there will likely be notice and transition time if legislation passes. But that doesn’t mean you should delay preparing.

Smart steps to take in 2025 include:

Reviewing your fund allocation quarterly
Using the TSP calculators to estimate long-term returns
Exploring whether annuitizing a portion of your TSP could make sense in your case
Watching for updates from the Federal Retirement Thrift Investment Board

Why This Matters for Future Retirees

If you’re still working but plan to retire in the next 5–10 years, changes to the G Fund could disrupt your current accumulation strategy.

You may need to rethink:

How much you’re contributing to the G Fund now
Whether to incorporate more exposure to fixed-income or lifecycle funds
How your withdrawal schedule will look if returns drop

Even if you’re years away from retirement, these policy changes could shift how you balance growth versus preservation across your entire TSP portfolio.

Staying Proactive with Your Retirement Plan

Being aware of potential legislative changes and adapting accordingly is part of responsible retirement planning. The proposed shift in G Fund yield calculation would primarily affect those who prioritize stability—but its ripple effects could be felt across all TSP investors.

Take this opportunity to:

Revisit your long-term income projections
Evaluate inflation risk against current fund yields
Align your portfolio with your actual risk tolerance and spending needs

And most importantly, keep tabs on the outcome of the proposed legislation. The financial landscape for public sector retirees is evolving, and your strategy should evolve with it.

What You Should Do Next

This proposed change may not be final—but it is real enough to warrant your attention. Whether you’re retired, close to retirement, or still in the accumulation phase, now is the time to get clarity on how reliant you are on the G Fund and whether adjustments are needed.

For tailored guidance based on your unique situation, speak with a licensed agent listed on this website. Professional support can help ensure that your plan remains secure, even if policy shifts.