TSP Participation Is at an All-Time High — Is Your Strategy Keeping Up?

The Thrift Savings Plan just hit an all-time participation high. According to Federal News Network, more federal employees are contributing to their TSP than at any point in the program’s history — with participant satisfaction at nearly 94%.

That’s genuinely good news. But participation is only half the equation. The fund you’re in, the percentage you’re contributing, and how you plan to withdraw in retirement are what actually determine how much you end up with. Here’s what most federal employees get wrong about each one.

First: The TSP Basics Worth Knowing

The Thrift Savings Plan is a defined contribution retirement savings plan for federal employees — essentially the government’s version of a 401(k). Under FERS, it’s the second leg of your three-part retirement income alongside your pension and Social Security.

The government automatically contributes 1% of your base salary whether you contribute or not. If you contribute, the government matches up to an additional 4% — for a total potential match of 5%. If you’re not contributing at least 5%, you’re leaving free money on the table.

The Five Core Funds — What They Are and Who They’re For

G Fund — Government Securities

The safest option — backed by U.S. Treasury securities with no risk of losing principal. The trade-off: returns are low, typically below inflation over long periods. Best for employees within a few years of retirement or those with very low risk tolerance.

F Fund — Fixed Income Index

Tracks the Bloomberg U.S. Aggregate Bond Index. Slightly more return potential than the G Fund with modest risk. Useful as a stabilizer in a diversified portfolio.

C Fund — Common Stock Index

Tracks the S&P 500. Historically the highest-returning TSP fund over long periods, with corresponding volatility. The backbone of most growth-oriented TSP portfolios for employees 10+ years from retirement.

S Fund — Small Cap Stock Index

Tracks smaller U.S. companies outside the S&P 500. Higher growth potential than the C Fund, higher volatility. Often used as a complement to the C Fund.

I Fund — International Stock Index

Tracks international stocks in developed markets. Provides geographic diversification. The I Fund finished 2025 with 12 months of positive returns — one of 12 out of 15 TSP funds that returned more than 11% for the year.

The Lifecycle (L) Funds — Simple, But Not Always Optimal

The L Funds are target-date funds that automatically shift your allocation from aggressive (more stocks) to conservative (more bonds) as you approach your target retirement date. They’re a reasonable default if you don’t want to actively manage your allocation.

The limitation: L Funds are designed for the “average” federal employee. If you have a pension providing stable income in retirement, you may be able to afford more growth exposure in your TSP than the L Fund assumes — meaning a more aggressive allocation may be appropriate longer than the L Fund provides it.

Three TSP Mistakes Federal Employees Make

1. Parking everything in the G Fund out of fear. The G Fund feels safe — and it is, in the short term. But if you’re 15 years from retirement, inflation erodes the real value of low-returning assets over time. Safety has a cost.
2. Not increasing contributions after a raise. Every step increase, promotion, or locality pay adjustment is an opportunity to increase your TSP contribution percentage. Most employees never revisit theirs after initial enrollment.
3. Ignoring the Roth TSP option. Traditional TSP contributions are pre-tax — you pay taxes in retirement. Roth TSP contributions are post-tax — withdrawals in retirement are tax-free. For employees expecting higher taxes in retirement, Roth contributions may make more sense. This is an active decision worth making, not the default.

TSP and Your FERS Pension — How They Work Together

Your FERS pension provides predictable income for life. Your TSP provides flexibility — it’s the piece you control most actively before and in retirement. The pension covers your baseline; the TSP covers everything above it.

One common mistake: withdrawing too aggressively from TSP early in retirement and depleting it before later years when healthcare costs tend to rise. A withdrawal strategy — not just an accumulation strategy — matters.

Two Actions to Take Right Now

1. Log into tsp.gov and check your current contribution rate and fund allocation. If you haven’t looked in more than a year, something has probably drifted from where you want it.
2. Confirm you’re contributing at least 5% to capture the full government match. If you’re not, every pay period you’re under 5% is a permanent loss — the match doesn’t accumulate retroactively.

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Sources: Federal News Network, March 2026; tsp.gov. This article is for educational purposes only and does not constitute financial, legal, or retirement advice.