TSP fund allocation has gotten complicated with all the C/S/I/F/G comparisons, Lifecycle fund questions, and risk tolerance debates flying around. As someone who changed TSP allocations in response to news headlines early in my investing career and reliably underperformed by doing so, I learned exactly what each fund does and what a sensible allocation actually looks like. Today I will share it all with you.
The Five TSP Funds and What They Do
The Thrift Savings Plan offers five individual investment funds and a series of Lifecycle funds that blend them. The G Fund holds short-term U.S. Treasury securities — capital-guaranteed, never loses value, pays modest interest. The F Fund holds U.S. investment-grade bonds. The C Fund tracks the S&P 500 index. The S Fund tracks all publicly traded U.S. companies not in the S&P 500, weighted toward small and mid-cap stocks. The I Fund tracks international developed market stocks.
What Most Advisors Recommend for Long-Term Growth
For service members with 15+ years until retirement, the C, S, and I funds provide the equity growth exposure that drives long-term wealth accumulation. The G Fund’s capital guarantee comes at the cost of return — over 20-30 years, parking money in the G Fund dramatically underperforms a stock-heavy allocation.
That’s what makes the C/S/I combination endearing to younger service members who understand market volatility — short-term drops are temporary for someone with decades until they touch the money, and the long-term compounding advantage is significant. A common allocation for someone 20+ years from retirement: 60-70% C Fund, 20-30% S Fund, 10-20% I Fund, minimal G or F.
Lifecycle Funds as an Alternative
The L Funds automatically shift toward more conservative allocations as the target year approaches. For service members who want a set-it-and-forget-it approach, the L Fund closest to their expected retirement date is a defensible default. The expense ratios across all TSP funds are extremely low — TSP is one of the lowest-cost retirement vehicles available in the U.S.
Rebalancing Without Overthinking It
Checking and rebalancing annually — or after significant market moves — is sufficient. I’m apparently someone who changed TSP allocations in response to news headlines early in my investing career before learning that timing the market is a reliable way to underperform it. Set the allocation, automate contributions, review once a year.
The One Allocation That’s Almost Always Wrong
Probably should have led with this, honestly: leaving TSP contributions in the G Fund because it “feels safe” costs enormous amounts of money over a 20-year career. The G Fund is appropriate for money you’ll need in 1-3 years. For a 25-year-old service member, it’s a drag on long-term wealth creation that compounds painfully. The risk of stock funds going down in a given year is real — the risk of G Fund returns not keeping up with inflation over 20 years is certain.
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