Picking from the TSP funds can feel like guessing. You have five core choices, plus the L Funds, and nobody tells you how much to put in each one. Pick too safe, and your money may not keep up with prices. Pick too bold, and a market drop can hurt right when you need the cash.
Here's the thing: there's no single best TSP allocation for everyone. The right mix depends on your age, your goals, and how well you sleep when the market falls. This guide shows you how to think about it, with sample mixes and real dollar amounts.
This is education, not personal financial advice. Your situation is your own.
The Basics: How to Invest TSP With the Five Core Funds
Let's break down the building blocks. Each of the TSP funds does a different job.
The Five Core TSP Funds
- G Fund (Government Securities): Your money is lent to the U.S. government. You can't lose principal, and the interest rate follows Treasury rates. It's the safest option, but it grows slowly.
- F Fund (Fixed Income): This tracks the Bloomberg U.S. Aggregate Bond Index, a big basket of bonds. It can go up or down, but usually moves less than stocks.
- C Fund (Common Stock): This tracks the S&P 500, which is 500 large U.S. companies.
- S Fund (Small Cap Stock): This tracks the Dow Jones U.S. Completion TSM Index, which covers small and mid-size U.S. companies. It's usually bumpier than the C Fund.
- I Fund (International Stock): This tracks the MSCI EAFE index, which covers companies in developed countries outside the U.S. and Canada.
Why the Mix Matters
Think of stocks (C, S, I) as the "growth engine." Think of G and F as the "shock absorbers." You need both, and your age and comfort with risk decide the balance.
TSP fund costs are also very low, around 5 cents per $100 invested per year, so you can build your own mix cheaply. You can confirm current fund details and returns at TSP.gov. For a look at how each fund has done, see our TSP fund performance comparison.
Best TSP Allocation by Age
Age matters because of time. The more years you have before you need the money, the more time you have to recover from a bad market. Here are sample mixes. They're starting points, not rules.
In Your 20s and 30s (25+ Years to Go)
You have time on your side, so many people in this group lean heavily toward stocks.
- Sample mix: 80–90% in stock funds (C, S, I) and 10–20% in G or F.
- Example: 55% C, 15% S, 20% I, 10% F.
Why so much in stocks? Your contributions buy shares at many different prices. When the market drops, you're buying cheap. That's a good thing when retirement is decades away.
In Your 40s (15 to 25 Years to Go)
You still need growth, but your balance is bigger now. A big drop would sting more in dollars.
- Sample mix: 70–80% stocks, 20–30% G and F.
- Example: 45% C, 10% S, 15% I, 15% F, 15% G.
In Your 50s (5 to 15 Years to Go)
This is the "danger zone" for many people. A major drop close to retirement leaves less time to bounce back. Planners call this sequence of returns risk, which simply means bad timing can hurt more than a bad average.
- Sample mix: 50–65% stocks, 35–50% G and F.
- Example: 40% C, 5% S, 10% I, 20% F, 25% G.
If you're 50 or older, you can also make extra "catch-up" contributions. Our guide to TSP contribution limits has the current numbers.
In Your 60s and Beyond
You may need to start pulling money out. But you could also live 25 or 30 more years, so don't drop stocks completely.
- Sample mix: 30–50% stocks, 50–70% G and F.
- Example: 30% C, 5% S, 10% I, 20% F, 35% G.
Many retirees keep one to three years of expected withdrawals in the G Fund. That way they don't have to sell stocks in a down market. For more on this, see our TSP withdrawal strategies for federal retirees.
TSP Fund Allocation by Risk Tolerance
Age is only half the story. Two 40-year-olds can feel very differently about risk. Here's an easy way to check yourself.
The "Sleep Test"
Imagine your balance drops 30% in a year. Does that make you:
- Calm? You may be an aggressive investor.
- Nervous but okay? You may be moderate.
- Ready to sell everything? You may be conservative.
Be honest here. The best plan is one you'll actually stick with. Many people panic and sell at the bottom, which locks in losses.
Three Sample Risk Profiles
| Profile |
Stocks (C/S/I) |
Bonds (F) |
G Fund |
| Aggressive |
85–100% |
0–10% |
0–5% |
| Moderate |
60–75% |
10–20% |
10–20% |
| Conservative |
30–45% |
20–30% |
30–45% |
How Bad Can It Get?
Stocks can fall hard. The C Fund lost about 37% in 2008. The G Fund never lost principal that year. That gap is the whole reason to mix funds.
Splitting Within Stocks
Once you choose a stock percentage, you still need to divide it up. A simple approach:
- C Fund: the largest slice, often about 60–70% of your stock money.
- S Fund: a smaller slice, around 10–20%.
- I Fund: a mid-size slice, around 20–30%.
This spreads your risk across large U.S. companies, smaller ones, and companies overseas. Not sure how much risk you can afford? Your pension and Social Security matter here. If those cover most of your bills, you can usually take more risk with your TSP. The FERS retirement calculator guide explains how those pieces fit together.
Practical Examples: Real Dollar Amounts
Let's see how this looks with real money. These are made-up people, but the math is real.
Example 1: The Young Soldier
Sgt. Rivera, age 28, balance $20,000. She's under the Blended Retirement System and adds $300 a month. She's comfortable with risk and wants growth. (Her BRS match is covered in our TSP guide for military members.)
Her mix: 60% C, 15% S, 20% I, 5% F.
- C Fund: $12,000
- S Fund: $3,000
- I Fund: $4,000
- F Fund: $1,000
If stocks fall 30%, her $19,000 in stocks drops by $5,700. That hurts, but she's adding money every month at lower prices.
Example 2: The Mid-Career Civilian
Marcus, age 45, GS-12, balance $150,000. He's a moderate investor.
His mix: 45% C, 10% S, 15% I, 15% F, 15% G.
- C Fund: $67,500
- S Fund: $15,000
- I Fund: $22,500
- F Fund: $22,500
- G Fund: $22,500
Stocks are 70% of his money, or $105,000. A 30% stock drop would cost him $31,500, about 21% of his total balance.
Example 3: The Near-Retiree
Linda, age 58, balance $600,000. She wants to protect what she has.
Her mix: 30% C, 5% S, 10% I, 20% F, 35% G.
- C Fund: $180,000
- S Fund: $30,000
- I Fund: $60,000
- F Fund: $120,000
- G Fund: $210,000
Her stocks total $270,000. A 30% stock drop costs her $81,000, or 13.5% of her total.
Now compare that to a 90% stock mix. Her stocks would be $540,000, and the same drop would cost $162,000, or 27% of her total. That's double the pain in the same market.
Want Your Own Numbers?
These examples are generic. The easiest way to get your exact numbers is the federal retirement calculator. It's free, and it helps you estimate what your retirement income might look like. Seeing how much your pension and Social Security cover can help you decide how much TSP risk makes sense.
Common Mistakes and Misconceptions
Most people don't get hurt by picking the "wrong" fund. They get hurt by these habits:
- Leaving everything in the G Fund. It feels safe, and it protects your principal. But over decades, it may not keep up with rising prices. Safe in dollars isn't always safe in buying power.
- Mixing up contributions and transfers. Changing your contribution allocation only affects future paychecks. To move money you already have, you need an interfund transfer. Many people change one and think they changed both.
- Chasing last year's winner. A fund that jumped last year may not repeat. Past results don't promise future ones.
- Never rebalancing. The TSP doesn't rebalance your individual funds for you. Over time, your mix drifts.
- Panic selling. Moving to the G Fund after a crash locks in your loss. Then you may miss the recovery.
- Doubling up by accident. If you own the L Fund and individual funds, you may be holding the same things twice. Our L Fund guide covers that choice.
Step-by-Step: Build Your Own TSP Fund Allocation
Ready to act? Here's a simple plan.
- Check your current mix. Log in at TSP.gov and look at your balance by fund.
- Find your age bracket. Use the sample mixes above as a starting range.
- Take the sleep test. Move toward more stocks if you're calm about drops, or fewer if you're not.
- Choose your stock percentage first. For example, 70%.
- Split your stock money. Try about 65% C, 15% S, and 20% I of that slice.
- Split the rest. Divide the remaining 30% between F and G.
- Set your contribution allocation. This covers your future paychecks.
- Make an interfund transfer. This moves your existing balance to match the plan.
- Rebalance once a year. Suppose you have $100,000 at 70% stocks and 30% G. Stocks grow 20%. You'd have about $84,000 in stocks and $30,000 in G, so stocks are now about 74% of the total. Rebalancing means moving a few percent back.
- Review after big life events. A job change, a marriage, or a retirement date is a good time to recheck.
Also consider whether your contributions should be Roth or traditional. Our Roth vs traditional TSP guide can help. The IRS has tax rules for both.
For news that may affect your federal money, sites like FedWeek, GovExec, and Federal Times are good places to keep up.
Bottom Line
There's no perfect TSP fund allocation. But there is a good one for you. Here's what to remember:
- Younger investors usually lean toward stocks (C, S, I) because they have time to recover.
- Older investors usually add more G and F to protect against big drops.
- Your comfort with risk matters as much as your age. Take the sleep test.
- Your pension and Social Security affect how much risk you can afford.
- Rebalance once a year and avoid panic moves.
- Don't ignore the G Fund, but don't hide in it forever either.
Ready for numbers that fit your life? Try the federal retirement calculator to see your personal results, then use the steps above to set your mix. For more on pay and benefits, visit our pay info and benefits guide pages. If your situation is complex, talk with a qualified financial planner.