Learn How the Thrift Savings Plan Works

What the Thrift Savings Plan Is and Who Can Participate

The Thrift Savings Plan (TSP) is a retirement savings program created by the federal government for people who work in federal service. Think of it as a long-term savings account specifically designed to help federal employees, military members, and certain other government workers save money for retirement.

The TSP operates similarly to a 401(k) plan that private companies offer to their employees. However, the TSP is run by the Federal Retirement Thrift Investment Board, a government agency that manages the program's operations and investments. The main purpose is to provide a way for federal workers to set aside money during their working years so they have resources when they retire.

Several groups of people can participate in the TSP. Federal civilian employees under the Federal Employees Retirement System (FERS) can participate. Military members on active duty, in the Reserve, or in the National Guard can also open a TSP account. Members of the uniformed services, such as the Coast Guard and Public Health Service, have access as well. Some federal employees under the Civil Service Retirement System (CSRS) can make what are called "after-tax" contributions, though their participation works differently than FERS participants.

The program has grown significantly since its creation in 1986. As of 2023, the TSP held approximately $850 billion in assets and served roughly 6 million participants. This makes it one of the largest retirement plans in the United States by asset size. The program's popularity stems from its low fees, investment options, and the ability to build retirement savings over time with contributions taken directly from paychecks.

Practical Takeaway: If you are a federal employee, military member, or work for certain government agencies, you likely have the option to participate in the TSP. Understanding that the TSP functions as a long-term retirement savings vehicle is the first step toward making informed decisions about your financial future.

How Contributions Work and Where the Money Comes From

The TSP operates on a contribution system where you decide how much money to set aside from your paycheck for retirement savings. Each pay period, a portion of your salary can be directed into your TSP account. This money comes directly from your gross pay before federal income taxes are calculated, which means you pay less in taxes now. This is called a "pre-tax" or "traditional" contribution.

The amount you can contribute has annual limits set by the Internal Revenue Service. In 2024, federal employees and military members can contribute up to $23,500 per year from their regular salary. If you are age 50 or older, you can make additional "catch-up" contributions of up to $7,500 per year, bringing your total possible contribution to $31,000 annually. These limits apply across all of your TSP accounts combined if you have more than one.

In addition to your own contributions, you may receive matching contributions from your employer. If you are a federal civilian employee under FERS, your agency will match a portion of what you contribute. Specifically, if you contribute 3 percent of your salary, your agency contributes 3 percent. If you contribute 4 percent, your agency contributes 4 percent. If you contribute 5 percent or more, your agency still only contributes 4 percent. This matching money is essentially free money that your employer adds to your account, and it can significantly boost your retirement savings over time.

Military members receive employer contributions differently. Active duty service members receive automatic contributions from the Department of Defense even if they choose not to contribute their own money. In 2024, the automatic contribution is 1 percent of base pay. Additionally, service members who contribute their own money receive a matching contribution from the Department of Defense, similar to the civilian matching formula. For military members, the match can reach 5 percent if you contribute at least 5 percent of your salary.

You also have the option to make "Roth" contributions to the TSP. With Roth contributions, you contribute money that has already been taxed, but the growth and withdrawals in retirement are tax-free. Some people find this option valuable because they expect to be in a higher tax bracket in retirement. You can split your contributions between traditional and Roth if you wish.

Practical Takeaway: To maximize your TSP benefits, contribute enough to receive your full employer match. For federal employees, this means contributing at least 5 percent of your salary. This is often considered one of the most important steps in building retirement savings because you are receiving additional money from your employer at no additional cost to you.

Understanding the TSP Investment Funds and How Your Money Grows

Once money is in your TSP account, it does not sit idle in a savings account earning minimal interest. Instead, your contributions are invested in funds that aim to grow over time. The TSP offers several investment options, called funds, that you choose based on your age, risk tolerance, and retirement timeline.

The core investment options include five individual funds. The Government Securities Investment Fund (G Fund) invests in U.S. Treasury securities and is considered the most conservative option with lower risk but also lower expected growth. The Fixed Income Index Investment Fund (F Fund) invests in a broad range of bonds and fixed-income securities. The Common Stock Index Investment Fund (C Fund) tracks the performance of large U.S. companies. The Small Capitalization Stock Index Investment Fund (S Fund) focuses on smaller U.S. companies. The International Stock Index Investment Fund (I Fund) invests in stocks of companies outside the United States.

In addition to these five individual funds, the TSP offers Lifecycle Funds, often called L Funds. These funds are designed for people who want a simpler option. Each L Fund contains a mix of the five individual funds, and the mix changes automatically as you get closer to retirement. For example, the L 2050 Fund is designed for people expecting to retire around 2050. When you are far from retirement, the fund contains more stocks for growth potential. As you approach your retirement target year, the fund automatically shifts to contain more conservative investments. This automatic rebalancing saves you from having to manually adjust your investments as you age.

The TSP charges very low fees compared to many investment options available outside the federal system. The expense ratios for the individual funds range from approximately 0.02 percent to 0.06 percent annually. This means that on an investment of $10,000, you might pay between $2 and $6 per year in fees. These low fees are one of the significant advantages of the TSP, as lower fees mean more of your money remains invested and working toward growth.

Historical performance of the funds varies depending on market conditions. From 2000 to 2023, the C Fund (large U.S. companies) averaged around 9 percent annual returns, though individual years varied significantly. The S Fund (small companies) averaged slightly higher returns but with more volatility. The I Fund (international stocks) showed similar long-term returns to the C Fund but with different year-to-year performance patterns. The F Fund and G Fund provided lower but more stable returns. Past performance does not predict future results, but these historical patterns show how different fund options have performed over extended periods.

Practical Takeaway: Choose your investment mix based on how many years remain until you retire. Younger workers typically benefit from more stock-based investments like the C Fund, S Fund, or I Fund because they have time to recover from market downturns. Workers closer to retirement often choose more conservative options like the G Fund or F Fund. The L Funds offer a straightforward option that adjusts automatically based on your target retirement year.

Monitoring Your Account and Making Changes

Once your TSP account is established and contributions are flowing in, you can track the progress of your savings. The TSP provides online access through its website where you can log in with your account credentials. From your account dashboard, you can see your current account balance, view how much you have contributed year-to-date, and examine your investment holdings and their current values.

The TSP sends periodic statements to account holders. Federal employees and military members receive quarterly statements showing their account balance and how their investments have performed during that quarter. These statements break down your contributions, employer contributions, investment earnings, and any fees or losses. Additionally, the TSP website provides detailed transaction history so you can see every contribution made and track investment performance over time.

You have the ability to change your contribution amount at any time during the year. If you receive a raise, you might increase your contributions to take advantage of the