TSP L Funds (Lifecycle) Explained: Glide Path, Allocations, and What Your FERS Pension Changes

TSP L Funds are target-date funds that automatically manage your allocation across all five individual TSP funds, gradually shifting from growth to income as your retirement date approaches. They're the default investment for most new TSP enrollees — and the right choice for many federal employees. But the L Fund glide path is designed for a generic investor with no pension. If you have a FERS annuity, the math changes. Here's what the L Funds actually hold, how the glide path works, and how to decide whether an L Fund or a custom allocation serves your FERS retirement better.

What L Funds are

The TSP Lifecycle Funds — L Funds — are each a diversified blend of the five core TSP investment funds: the G, F, C, S, and I Funds. Rather than holding individual funds yourself, an L Fund participant owns a single fund that holds all five underneath, with the Federal Retirement Thrift Investment Board (FRTIB) managing the blend automatically.¹

The defining feature is the glide path: every L Fund except L Income automatically shifts its allocation quarterly, moving a small percentage from equity funds (C, S, I) into the G Fund. The farther the target date is in the future, the more aggressive the current allocation. As years pass, the quarterly shifts gradually reduce equity exposure and increase the G Fund's share, until the fund eventually reaches its target date and merges into L Income.

L Income itself does not shift — it maintains a relatively stable, conservative allocation appropriate for participants who are actively withdrawing funds.

Auto-enrollment default: Federal employees who are automatically enrolled in TSP and don't make an active fund election are placed in the L Fund whose target date is closest to the year they turn 62. This is the FRTIB's "appropriate" default, but it is not a recommendation for every employee's situation — particularly FERS employees with pensions who may be able to afford more equity exposure than the default glide path provides.

The complete L Fund lineup (2026)

As of 2026, the TSP offers eleven Lifecycle Funds:¹

Fund	Who it's for	Approx. total equity (May 2026)	Expense ratio
L Income	Currently withdrawing; no future target date	~22%	0.035%
L 2030	Withdrawals starting around 2030	~57%	0.039%
L 2035	Withdrawals starting around 2035	~65%	~0.040%
L 2040	Withdrawals starting around 2040	~72%	~0.040%
L 2045	Withdrawals starting around 2045	~76%	~0.040%
L 2050	Withdrawals starting around 2050	~80%	0.041%
L 2055	Withdrawals starting around 2055	~99%	~0.041%
L 2060	Withdrawals starting around 2060	~99%	~0.041%
L 2065	Withdrawals starting around 2065	~99%	0.041%
L 2070	Withdrawals starting around 2070	~99%	~0.041%
L 2075	Withdrawals starting around 2075	~99%	0.038%

Two significant changes happened in 2025:²

L 2025 retired into L Income on June 30, 2025. If you held L 2025, your balance was automatically transferred to L Income. L Income is now the terminal fund for all retired L Funds.
L 2075 was added in early 2025, extending the lineup for the youngest federal employees — those just entering service who won't retire until the 2070s.

How the glide path works

The FRTIB adjusts each L Fund's target allocation every quarter. The adjustment is a small, predictable shift: typically moving a fraction of a percent from equity funds (C, S, I) into the G Fund. Over decades, these small quarterly steps produce a smooth transition from an almost entirely equity portfolio to a predominantly G Fund portfolio.

The mechanics are worth understanding in detail:

The equity mix is fixed within each L Fund: The ratio of C Fund to S Fund to I Fund remains roughly constant regardless of the L Fund's age. The equity portion is approximately split 70% domestic (C + S) to 30% international (I), consistent across all L Funds. What changes is how much of the total portfolio is in equity at all.
The F Fund stays roughly constant: The F Fund allocation remains small (~5–6%) across all L Funds at all stages. The F Fund's role is modest bond diversification, not a primary holding.
The G Fund absorbs the shift from equities: As equity percentage declines over time, the G Fund is the primary recipient. By L Income, the G Fund represents the large majority of the portfolio (~74%). This matters for FERS employees: the G Fund's principal-guaranteed Treasury yields exist nowhere in an IRA, making L Income's dominant G Fund position genuinely valuable in retirement.

L Fund	Approx. G	Approx. F	Approx. C	Approx. S	Approx. I
L Income	~74%	~4%	~10%	~4%	~8%
L 2030	~37%	~6%	~26%	~9%	~22%
L 2040	~22%	~6%	~33%	~12%	~27%
L 2050	~14%	~6%	~36%	~13%	~31%
L 2055–2075	~0–1%	~1%	~46%	~18%	~35%

Weights are approximate as of May 2026. The FRTIB publishes exact monthly allocations at tsp.gov/publications/tsplf14.pdf. Allocations shift quarterly.

Why L Fund costs are so low

L Funds don't have separate expense layers on top of the underlying funds. Each L Fund's expense ratio is a weighted average of the expense ratios of the five individual funds it holds in proportion to how much of each it owns.³ Because the G and F Funds have very low costs (around 0.035%), and because L Income and conservative L Funds hold a lot of G Fund, they actually have lower total expense ratios than aggressive L Funds (which hold more I Fund — the most expensive at 0.054%).

In practice, the cost difference between L Income (0.035%) and L 2065 (0.041%) is negligible. A $500,000 TSP balance pays $175–$205/year in total expenses regardless of which L Fund you use. By comparison, a typical retail target-date fund charges 0.10–0.75% for equivalent or lower diversification.

The FERS pension changes the L Fund math

Target-date funds are designed for a generic investor whose only retirement income is their investment portfolio. For that person, the glide path makes sense: as retirement approaches, you have less time to recover from a market drop, so you reduce equity risk.

FERS employees are not that generic investor.

Your FERS pension is a bond that already lives in your retirement income. A federal employee retiring at 60 with a $72,000/year FERS annuity has the equivalent of a large, inflation-adjusted bond generating guaranteed income for life. If that pension covers 80–90% of living expenses, the TSP's entire job may be to grow the remaining gap and cover discretionary spending.

That means you may be able to stay in more aggressive TSP funds — more C, S, and I, less G — than the L Fund's glide path assumes. The L Fund doesn't know you have a pension. It's designed for someone who needs their portfolio to cover everything.

Concrete illustration: A 55-year-old DOD employee plans to retire at 62 with a FERS pension of $65,000/year (covering rent, utilities, and food) plus Social Security at 67 of $28,000/year. Their TSP balance of $900,000 needs to cover only discretionary spending — travel, gifts, home maintenance — perhaps $30,000/year. At the 4% rule, a $750,000 TSP balance supports $30K/year in perpetuity. She has $900K. She doesn't need to de-risk aggressively. The L 2030 fund will have her at ~57% equity by 2030 — but a case can be made for staying at 80% equity through and into retirement, given her pension + SS floor.

This doesn't mean "ignore the L Fund and go 100% C Fund." It means: understand the glide path's assumption, then decide if your actual income picture justifies a more aggressive stance than the default. A fee-only advisor who specializes in FERS planning can run this analysis with your specific numbers.

When L Funds are the right choice

The L Fund's simplicity is its primary feature. If you want a reasonable, professionally-managed allocation that you never have to touch, an L Fund does that. Specific situations where an L Fund is a strong default:

New to TSP, haven't thought through allocation yet: An L Fund is far better than leaving money in the default G Fund through inaction, which is the alternative for many employees who don't actively elect a fund.
You find individual fund allocation decisions stressful or confusing: Choosing between C, S, and I funds and rebalancing annually takes effort. The L Fund eliminates that. The small cost of suboptimal allocation versus your specific FERS situation is usually worth the simplicity and the discipline it enforces.
You don't have a FERS pension (CSRS employees, certain temporary employees): Without a pension floor, the L Fund's conservative glide path near retirement is more appropriate, because your TSP may need to fund most of your retirement.
You're early career and don't want to manage allocations: An L 2055 or L 2060 at 99% equity is functionally equivalent to a custom C+S+I allocation — you're getting nearly full equity exposure without the manual management.

When a custom allocation might beat the L Fund

The L Fund's glide path is not optimized for any specific situation. Custom allocations may outperform for federal employees in these scenarios:

Large FERS pension covers most expenses: If your pension + SS floor covers 85%+ of living costs, your TSP is primarily a supplemental growth vehicle. Staying in more equity than the L Fund prescribes — potentially into retirement — is defensible.
G Fund access is your reason to stay in TSP: If your primary reason to keep money in TSP after retirement is the G Fund's principal-guaranteed Treasury yields, you may want to self-manage a G Fund + equity split rather than let the L Fund's quarterly shift move you away from it prematurely.
You want to run a bucket strategy: Some retirement planners build a 2–3 year income bucket in the G Fund with the remainder in C+S+I. The L Fund's fixed glide path doesn't accommodate this bucket approach; you'd need individual fund control to implement it.
You want pure U.S. equity (no international): Some federal employees prefer to hold only C and S Funds, avoiding the I Fund's currency exposure. The L Fund includes I Fund whether you want it or not. If you have a deliberate reason to exclude international equities, a custom C+S allocation lets you do that; an L Fund does not.

How to pick the right L Fund: retirement date vs. withdrawal date

Most guidance tells you to pick the L Fund closest to your retirement date. That's often wrong for federal employees.

The correct L Fund is the one closest to when you plan to start drawing down your TSP balance — which may be years or decades after you leave federal service.

Consider: a VA physician retires at 57 (MRA+30) with a FERS pension of $95,000/year plus a spouse's Social Security. Their combined income exceeds expenses before touching TSP. They plan to let TSP grow untouched until age 73, when RMDs require withdrawals. The withdrawal date is 73, not 57. That's a 16-year difference in target date selection — an L 2045 or L 2050 rather than an L 2030. The difference in glide path is enormous: L 2030 at 57% equity vs. L 2050 at 80% equity. Over 16 years of additional growth, that allocation difference compounds significantly.

The withdrawal-date rule: Choose the L Fund matching the year you expect to begin drawing down your TSP — not the year you retire. If you'll live off pension + Social Security for years after federal service, your effective TSP withdrawal date could be 10–20 years after your last federal paycheck.

L Funds vs. retail target-date funds after a rollover

When federal employees retire and consider rolling TSP funds to an IRA, one comparison is the L Fund vs. a retail target-date fund (Vanguard Target Retirement, Fidelity Freedom Index, etc.).

Feature	TSP L Fund	Vanguard Target Retirement (IRA)
Expense ratio	0.035–0.041%	0.08%
Safe fixed-income option	G Fund (principal guaranteed, Treasury yields)	Bond index only (no principal guarantee)
International exposure	I Fund (ex US, ex China/HK)	Total international (includes China)
Customization	None; can only select target date	None; can only select target date
Rule of 55 access	Yes — TSP distributions from separation at 55+ are penalty-free	No — IRA distributions before 59½ incur 10% penalty
In-plan Roth conversion	Available since Jan 2026	N/A (IRA already has Roth)

The primary TSP advantage for a retiree using an L Fund is the G Fund component in the glide path's fixed-income portion. As the L Fund shifts toward conservative, that shift lands in the G Fund — something no IRA target-date fund can replicate. Retail target-date funds shift into a bond index, which carries both interest-rate risk and default risk that the G Fund does not.

L Fund allocation and the IFT limit

TSP allows two unrestricted interfund transfers per calendar month. After the second IFT, any additional transfers must move money into the G Fund only.⁴

For L Fund participants, this limit mostly doesn't apply — the FRTIB's quarterly rebalancing is automatic and does not count against your IFT limit. You can move into or out of an L Fund (or switch between L Funds) as part of your two monthly IFTs.

Where the IFT limit matters for L Fund participants: if you decide you want to exit the L Fund and manage individual funds yourself, that exit uses one of your two monthly IFTs. If you then change your mind and want to return to an L Fund in the same month, that return uses the second. You can't reverse course a third time until the next month.

2025 L Fund performance in context

The 2025 TSP returns were exceptional across the board, primarily driven by the C Fund (+17.85%) and especially the I Fund (+32.45%).⁵ L Fund returns reflected how much equity each fund held:

Aggressive L Funds (L 2055–2075, ~99% equity): Returns roughly in line with a blend of C, S, and I Fund performance — likely in the 18–22% range given the I Fund's outsized contribution.
Moderate L Funds (L 2040–2050, 72–80% equity): Solid returns blended down by the G Fund allocation, roughly 14–18%.
Conservative L Funds (L 2030, ~57% equity): Approximately 11–14%, depending on exact G/F allocations.
L Income (~22% equity): Primarily G Fund return (~4–5%) blended with modest equity returns, likely in the 7–9% range.

These figures are approximations derived from the known individual fund returns and approximate L Fund weights. For exact historical L Fund returns, tsp.gov/fund-performance/ is the authoritative source.

L Fund common mistakes

Matching the L Fund to retirement date instead of withdrawal date. If you retire at 57 but won't touch TSP until RMDs kick in at 73, picking L 2030 (targeting your 2030 retirement) leaves you in a ~57% equity fund when you could reasonably stay at 80% equity for 16 more years of growth. The withdrawal date is the correct anchor.
Treating the L Fund as a substitute for a FERS retirement strategy. The L Fund manages your TSP allocation. It doesn't coordinate with your FERS pension timing, Social Security claiming date, FEHB decision, survivor annuity election, or Roth conversion window. Those decisions require a complete retirement income plan, not just a target-date fund selection.
Moving out of the L Fund when markets drop and back in when they recover. The quarterly shift is designed to work over decades. Selling an L Fund in a market downturn — then re-entering after recovery — captures losses and misses gains. This is the same behavioral mistake that hurts retail investors in Vanguard target-date funds, and it happens in TSP too. If you can't tolerate the L Fund's equity exposure during a downturn, the right fix is switching to a more conservative L Fund, not exiting and re-entering.
Not understanding what changes and what doesn't. When you hold an L Fund, the FRTIB changes your allocation automatically every quarter. Your TSP account statements will show the same L Fund name, but the underlying G/F/C/S/I percentages will have shifted slightly. Many participants don't realize this — and some misinterpret the quarterly shift as a "fund change" when nothing has changed except the weights.
Ignoring the G Fund in L Income. Federal employees who retire and move to L Income often focus on the ~22% equity component for growth. But the dominant ~74% G Fund allocation is not just "not losing money" — it's earning intermediate-term Treasury yields with full principal protection, something that doesn't exist in any IRA. L Income's G Fund holding is one of the primary reasons some retirees should consider staying in TSP rather than rolling to an IRA.
Selecting L Income too early. L Income is appropriate when you are actively withdrawing TSP funds to cover regular living expenses. If you're retired but living off FERS + Social Security and not yet touching TSP, L Income's ~22% equity allocation is likely too conservative for your actual situation. A more aggressive L Fund (matching your actual withdrawal date) keeps more of your balance in growth assets during what may be a long period before you need the money.

Is your L Fund matched to your actual situation?

Choosing the right L Fund — or deciding whether a custom allocation serves you better — depends on your FERS pension amount, Social Security timing, planned TSP withdrawal date, and how much of your retirement income the portfolio actually needs to cover. Most federal employees who've run this analysis with a specialist find that the default L Fund is either too conservative (if they have a large pension floor) or too aggressive (if they're close to needing full TSP distributions). The correct answer is rarely the default.

Related guides

Lifecycle Funds — tsp.gov. Official description of all L Funds, glide path structure, target allocation concept, and current fund lineup. L Fund allocations shift quarterly; verified May 2026.
Retirement of the L 2025 Fund and Launch of New L 2075 Fund — tsp.gov Bulletin 25-1. L 2025 merged into L Income on June 30, 2025; L 2075 added to the lineup in 2025.
TSP Fund Information May 2026 — tsp.gov. Expense ratios for all L Funds: L Income 0.035%, L 2030 0.039%, L 2050 0.041%, L 2065 0.041%, L 2075 0.038%. Each L Fund's ratio reflects the weighted costs of its underlying G/F/C/S/I holdings.
5 CFR Part 1601 — Participants' Choices of TSP Funds. Federal regulation governing interfund transfer rules: two unrestricted IFTs per calendar month; subsequent transfers restricted to the G Fund only.
TSP Performance Soars in 2025 — FedSmith. 2025 annual returns: I Fund +32.45%, C Fund +17.85%, S Fund +11.38%. L Fund returns derived from individual fund weights.

L Fund allocation weights are approximate as of May 2026 per TSP Fund Information May 2026. Exact weights shift quarterly; see tsp.gov/publications/tsplf14.pdf for current figures. Performance data through May 2026. Past performance does not predict future results.