The federal employee TSP guide

The Thrift Savings Plan (TSP) is a defined-contribution retirement savings plan for federal employees and uniformed services members. Created by the Federal Employees' Retirement System Act of 1986, it operates similarly to a private-sector 401(k) — you contribute from each paycheck, the agency may match your contributions, and your account grows through investment in a menu of funds.

Unlike the FERS pension, which is calculated by a fixed formula (service × salary × multiplier), your TSP balance depends entirely on how much you contribute, how long you contribute, and how your investment choices perform. Two employees with identical federal careers can retire with vastly different TSP balances based on contribution rates and fund allocation alone.

The TSP is administered by the Federal Retirement Thrift Investment Board (FRTIB) and has the lowest expense ratios of any large retirement plan in the United States — typically 0.04% to 0.06% annually, compared to 0.5%–1.5% for many private-sector 401(k)s. Over a 30-year career, the difference in fees alone can amount to tens of thousands of dollars.

For a typical federal career employee, TSP is the largest single component of retirement income — often representing 40–55% of total retirement income when combined with the pension and Social Security. Getting TSP right matters enormously.

The IRS sets annual limits on how much you can contribute to your TSP through salary deferrals. Agency contributions (automatic 1% and matching contributions) do not count toward these limits.

The super catch-up provision, introduced by SECURE 2.0 effective January 2025, allows employees ages 60 through 63 to contribute 150% of the standard catch-up limit — the highest contribution window of any age group. If you are in this window, it is worth maximizing.

Contribution limits typically increase by $500 increments annually with inflation adjustments from the IRS. Check TSP.gov each year in late October or November for the updated limits.

Practical note on FERS employees: To capture the full agency match, you only need to contribute 5% of your basic pay — far below the annual elective deferral limit for most employees. Increasing contributions beyond 5% is always beneficial, but the match itself requires only 5%.

FERS employees receive two types of agency contributions to their TSP:

1. Automatic 1% contribution: Your agency deposits 1% of your basic pay each pay period into your TSP — even if you contribute nothing yourself. This contribution is immediate; it does not require any action on your part. However, it is subject to a vesting schedule: you must have 3 years of service (2 years for Congressional employees) to keep it if you leave before then.
2. Matching contributions: For the first 3% of your basic pay you contribute, the agency matches dollar-for-dollar. For the next 2% you contribute, the agency matches at 50 cents per dollar. This gives you a total of up to 4% in matching contributions when you contribute at least 5%.

Contributing less than 5% is leaving guaranteed compensation on the table. The return on a matched contribution — before any investment growth — is 100% for the first 3% and 50% for the next 2%. No other low-risk financial move available to federal employees comes close to that.

Below are dollar amounts for the agency match at several common federal salary levels, assuming a 5% employee contribution:

Over a 30-year career at $100,000 salary (assuming no raises for simplicity), capturing the full agency match generates $150,000 in agency contributions alone — before any investment returns. At a 6% average annual return, those agency contributions alone would grow to over $395,000 by retirement.

This is why the universal recommendation for FERS employees is to contribute at least 5% of basic pay to the TSP as early as possible — regardless of what fund you choose.

The TSP offers both traditional (pre-tax) and Roth (after-tax) contribution options. You can split your contributions between the two in any proportion.

For most mid-career federal employees, a blend of traditional and Roth contributions provides the most flexibility in retirement. Traditional TSP reduces your tax bill today; Roth TSP creates a tax-free pool you can draw from strategically to manage your taxable income in retirement (e.g., staying below thresholds that affect Medicare premiums or Social Security taxation).

Note that agency matching contributions always go into the traditional TSP account, regardless of your election. So every FERS employee with a TSP will have some traditional balance.

The TSP offers five individual funds and a series of Lifecycle (L) funds that blend the five core options:

The G Fund is unique: It earns a return tied to the average interest rate of all U.S. Treasury securities with maturities of 4 years or more, but it has no market risk — your principal never declines. This makes it very attractive for short-time-horizon investors (those within a few years of retirement), but its real return after inflation is often near zero or negative in low-rate environments.

For long time horizons: The C Fund, S Fund, and a global stock mix (C/S/I combination) have historically produced far higher returns than the G or F funds. Over 20 or 30 years, the difference between a 3% average return (G Fund) and a 9% average return (blended C/S/I) on the same contributions is enormous — often a 3x to 5x difference in final balance.

There is no "best" fund for everyone. Your allocation should reflect your time horizon to retirement, risk tolerance, and total retirement income picture (those with larger pensions can afford more TSP risk since the pension provides a guaranteed floor).

The Lifecycle (L) funds are target-date funds that automatically rebalance your TSP allocation over time. Each L Fund is named for an approximate retirement year (L 2025, L 2030, L 2035, L 2040, L 2045, L 2050, L 2055, L 2060, L 2065). You choose the fund closest to your expected retirement year and leave it alone.

How they work: L Funds start with a heavy equity allocation (mostly C, S, and I funds) when your retirement date is far away, and gradually shift toward more conservative holdings (G and F funds) as you approach retirement. This is called a "glide path."

What they are made of: Each L Fund is a blend of the five individual funds. For example, the L 2050 Fund (for those retiring around 2050) currently holds approximately 65% stocks (C/S/I) and 35% bonds/stable (G/F). The L Income Fund, designed for those already in retirement, holds approximately 74% G Fund.

Who should use L Funds: The L Funds are a reasonable default for employees who do not want to manage their own allocation. They provide built-in diversification and automatic rebalancing. They are not perfect — the glide path may be more conservative than necessary for employees with large pensions providing a retirement income floor — but they are far better than leaving contributions in the G Fund by default (which is what happens if you never make a fund election).

The default problem: New FERS employees are automatically enrolled at 5% of basic pay, directed into the age-appropriate L Fund. This automatic enrollment at exactly 5% captures the full agency match — which is intentional. If you never change your enrollment, you'll be in the right L Fund and will capture the full match, which is a reasonable outcome.

The TSP allows you to borrow from your account balance or make hardship withdrawals. These options exist for emergencies, but using them reduces the compounding growth of your retirement savings.

TSP Loans: You can borrow up to 50% of your vested account balance, up to $50,000. There are two types: general-purpose loans (repaid within 5 years) and residential loans (repaid within 15 years). You pay the loan back with interest into your own account — so the interest goes to you, not a lender. However, the funds taken out lose their investment growth during the loan period, and if you leave federal service before repaying, the outstanding balance is treated as a taxable distribution (with potential early withdrawal penalties if you are under 59½).

In-service withdrawals: Age-based withdrawals are available once you turn 59½ — you can take partial or full withdrawals from your TSP while still employed. Hardship withdrawals (before 59½) are also available for specific financial emergencies, but they are subject to ordinary income tax and a 10% early withdrawal penalty.

The most common TSP mistake is withdrawing or not repaying a loan after leaving federal service, which triggers an unexpected tax bill. If you are within 5 years of retirement, consider avoiding TSP loans entirely.

Once you separate from federal service, you have multiple options for how to take money out of your TSP. These are not mutually exclusive — you can combine them.

• Installment payments: Receive fixed monthly, quarterly, or annual payments from your TSP. You choose the amount or set a period (e.g., 20 years). This is the most common approach.
• Single lump-sum withdrawal: Take some or all of your account at once. Fully taxable in the year received if traditional TSP; watch for bracket impact on large lump sums.
• TSP Life Annuity: Purchase a guaranteed lifetime annuity from MetLife through the TSP program. Provides lifetime income but you give up control of the principal. Generally less flexible than keeping the balance in TSP and taking installments.
• Transfer/rollover: Roll your TSP to an IRA or another employer plan. Gives you more investment choices but higher fees and loss of TSP's extremely low expense ratios.

Required Minimum Distributions (RMDs): You must begin taking distributions from traditional TSP balances by April 1 of the year following the year you turn 73 (under SECURE 2.0). If you are still working at 73, you can delay RMDs until you separate. Roth TSP balances are not subject to RMDs during your lifetime.

The FERS estimator models TSP growth and withdrawal amounts alongside your pension and Social Security, so you can see how different contribution rates and withdrawal strategies affect your total retirement income.

Here is the priority order for TSP decisions, from highest to lowest impact:

1. Contribute at least 5% immediately. Capture the full agency match. If you are contributing less than 5%, you are forfeiting guaranteed compensation. This is the highest-return action available.
2. Increase contributions as income grows. Every pay raise is an opportunity to raise your TSP contribution. Ideally, contribute 10–15% of basic pay (employee plus agency) over your career.
3. Avoid the G Fund as a default. If you joined the TSP before the automatic enrollment era, or if you changed your election to the G Fund at some point, review your current allocation. The G Fund loses purchasing power over long time horizons in inflationary environments.
4. Use L Funds or a simple C/S/I blend. For most employees, a simple three-fund portfolio (C, S, I in roughly 60/20/20 split) or the age-appropriate L Fund is sufficient. Don't over-engineer your allocation.
5. Consider Roth contributions mid-career. If you have 20+ years until retirement, the tax-free growth on Roth contributions is valuable. A traditional/Roth blend provides flexibility in retirement.
6. Max out super catch-up at ages 60–63. The $34,750 total contribution limit in this window is the highest available. If you can afford it, it is worth taking advantage of.
7. Review your beneficiary designation. TSP beneficiary designations are separate from your will and override it. Verify your designation is current, especially after marriage, divorce, or the death of a named beneficiary.