If you'd rather not pick and rebalance your own mix of the G, F, C, S, and I funds, the TSP's Lifecycle ("L") Funds do it for you. They're a simple, low-effort way to invest appropriately for your age — and they're the default for many service members.
Each L Fund is a ready-made blend of the five core funds, mixed for a particular target retirement date. You pick the fund whose date is closest to when you expect to start withdrawing money, and the TSP handles the rest.
The magic is automatic rebalancing along a glide path. When your target date is far away, the fund holds mostly stocks (C, S, I) to pursue growth. As the date approaches, it gradually and automatically shifts toward the safer G and F funds to protect what you've built. You never have to log in and adjust anything — it de-risks on a schedule.
The funds come in five-year increments — L Income, L 2030, L 2035, L 2040, and so on, up to the L 2070s. Pick the one matching roughly when you'll need the money:
If you want simplicity and "set it and forget it," an L Fund is hard to beat. If you enjoy controlling your allocation and will actually rebalance over time, building your own mix of core funds gives you more precision. Many people reasonably choose the L Fund and move on with their lives.
Illustrative example of how an L Fund's blend of stocks (C/S/I) versus safer funds (G/F) changes as the target date approaches:
| Years to target date | Roughly stocks (C/S/I) | Roughly G/F |
|---|---|---|
| 30+ years out | ~90% | ~10% |
| 15 years out | ~70% | ~30% |
| 5 years out | ~50% | ~50% |
| At / into retirement (L Income) | ~20–30% | ~70–80% |
Exact percentages are set by the TSP and adjusted over time; the point is the automatic drift from growth toward stability.
If you've used a target-date fund in a civilian 401(k), L Funds work the same way — a single, auto-rebalancing, age-appropriate portfolio. The difference is that L Funds are built only from the TSP's five ultra-low-cost core funds, so you get that simplicity without the higher fees some retail target-date funds carry.
Project your TSP growth in the calculator →Pick the fund whose date is closest to when you'll start withdrawing the money — which may be later than your military retirement if you won't tap the TSP until your 60s. Want more or less risk? Choose a later-dated (more aggressive) or earlier-dated (more conservative) fund.
Yes. They're designed as a one-decision, hands-off option that diversifies and de-risks automatically — a sensible default for anyone who doesn't want to manage investments.
Generally no. Mixing an L Fund with individual funds can unintentionally skew your overall allocation and defeats the L Fund's purpose. Pick one approach.
No. L Funds are built from the same low-cost core TSP funds, so their costs stay among the lowest available — you don't pay extra for the automatic management.
Related reading: TSP funds explained (G/F/C/S/I) · How the TSP 5% match works · Roth vs. Traditional TSP