The Thrift Savings Plan is a retirement account for federal employees and military members, not a regular savings account

The Thrift Savings Plan (TSP) is a retirement savings account run by the federal government specifically for people who work for the federal government, the military, or certain other federal agencies. It functions like a 401(k) — you contribute money from your paycheck before taxes, choose how that money is invested, and withdraw it in retirement. The account itself is not a place to park money for emergencies or near-term goals the way a savings account is.

TSP is administered by the Federal Retirement Thrift Investment Board, a separate agency from the Treasury or Social Security. If you are a federal employee or service member, your employer automatically sets up a TSP account for you — you do not have to open one separately. If you are self-employed or work in the private sector, you cannot open a TSP account at all.

The key difference from a regular savings account: your money goes into investment funds (stocks, bonds, or a mix), not into a cash balance. The account grows through your contributions and investment returns, but you cannot withdraw the money without penalty until you reach retirement age, with very limited exceptions.

Key Takeaways

  • TSP is only available to federal employees, military members, and certain other federal workers — private sector employees cannot open one.
  • Money you contribute is deducted from your paycheck before income tax is calculated, which lowers your taxable income for that year.
  • You choose how your money is invested among five core funds and several target-date funds, and you can change your choice once per month.
  • Withdrawing money before age 59½ typically results in a 10 percent penalty plus income tax, unless you meet specific exceptions like a hardship withdrawal or separation from federal service.
  • TSP has lower fees than most private retirement accounts because it is government-run and not designed to make profit.

How money moves into your TSP account

When you are hired as a federal employee or service member, your agency or military branch automatically enrolls you in TSP. You choose a contribution rate — the percentage of your paycheck that goes into the account — through your agency's payroll system. That amount is deducted from your gross pay before federal income tax is calculated.

Your agency also makes a matching contribution if you contribute at least 3 percent of your salary. The match works like this: if you contribute 3 percent, the agency adds 3 percent; if you contribute 4 percent, the agency adds 4 percent; if you contribute 5 percent or more, the agency still adds only 4 percent. This is information programs, so most financial advisors recommend contributing at least 5 percent to capture the full match.

The money lands in your TSP account within a few business days of your paycheck being processed. You then direct where that money is invested by choosing from the available funds. If you do not make a choice, the money goes into a default target-date fund based on your age.

The five core funds and how to choose between them

TSP offers five core investment funds, each holding a different type of security. The Government Securities Investment Fund (G Fund) holds U.S. Treasury bonds and is the most conservative — your money does not grow much, but it does not lose value either. The Fixed Income Index Investment Fund (F Fund) tracks a broad bond index and offers slightly more growth potential than the G Fund with slightly more risk.

The Common Stock Index Investment Fund (C Fund) tracks the S&P 500 and represents large U.S. companies. The International Stock Index Investment Fund (I Fund) holds stocks from companies outside the United States. The Small Cap Stock Index Investment Fund (S Fund) focuses on smaller U.S. companies and is the most volatile of the five.

Most people do not pick individual funds. Instead, they choose a target-date fund, which automatically mixes these five funds based on how many years until you turn 65. A target-date fund for someone retiring in 2050 holds more stocks now and gradually shifts toward bonds as 2050 approaches. You can change your fund choice once per calendar month, and the change takes effect the next business day.

When you can and cannot withdraw money

The standard rule is that you cannot withdraw TSP money until you separate from federal service or reach age 59½. If you withdraw before then, you owe a 10 percent penalty on top of income tax on the amount you take out. A $10,000 withdrawal at age 45 could cost you $1,000 in penalty plus $2,000 to $3,000 in federal income tax, depending on your tax bracket.

TSP does allow in-service withdrawals for specific hardships: medical expenses, funeral costs, home repairs from a disaster, or payments to avoid eviction or foreclosure. You must document the hardship and show that you have no other resources to cover it. The process takes several weeks, and you still owe income tax on the withdrawal, though not the 10 percent penalty.

If you separate from federal service — you leave your job, retire, or are laid off — you can withdraw your money without the 10 percent penalty, though you still owe income tax. You can also leave the money in TSP and let it grow, or roll it into an IRA or another retirement account. If you are separated and under age 59½, you have the option to take substantially equal periodic payments (SEPP), which lets you withdraw a calculated amount each year without the penalty.

TSP fees and why they matter over time

TSP charges an annual administrative fee of around $25 to $35 per account, regardless of your balance. Individual funds charge expense ratios — the annual cost to manage that fund — that range from 0.02 percent to 0.06 percent of your balance. These are among the lowest fees in the retirement account industry.

For comparison, a private 401(k) or IRA might charge 0.5 to 1.5 percent in annual fees. Over 30 years, the difference compounds. A $100,000 balance growing at 7 percent annually costs you roughly $2,000 in fees with TSP but $15,000 to $30,000 with a typical private account. That difference comes directly out of your retirement savings.

How TSP differs from a Roth account

TSP contributions reduce your taxable income in the year you make them — you pay tax on that money later, in retirement, when you withdraw it. This is called a traditional account structure. The federal government also offers a Roth TSP option, where you contribute money that has already been taxed, and then withdrawals in retirement are tax-free.

Which is better depends on whether you expect to be in a higher or lower tax bracket in retirement. If you think you will earn less in retirement than you do now, traditional TSP makes sense because you will pay tax at a lower rate. If you think you will have substantial other income in retirement, Roth TSP may save you money. You can split your contributions between both types, and you can change your choice each year.

What happens to TSP if you leave federal service

Your TSP account belongs to you, not your employer. If you leave federal service, the money stays in TSP unless you move it. You can leave it there indefinitely, withdraw it all at once, take monthly payments, or roll it into an IRA. You do not have to decide when ready — you have until April 1 of the year after you turn 73 to begin withdrawals, and you can change your mind about how to withdraw it.

If you die before withdrawing all your money, your designated beneficiary inherits the account. The beneficiary can take a lump sum, roll it into their own IRA, or take payments over time. TSP does not charge a fee to transfer the account to a beneficiary.

Frequently Asked Questions

Can I borrow money from my TSP account?

Yes. You can take a loan against your TSP balance and repay it through payroll deductions. The loan term is typically one to five years, and you pay interest (currently around 4 percent). If you leave federal service before repaying the loan, the unpaid balance is treated as a withdrawal and you owe income tax and potentially the 10 percent penalty on it.

What happens if I do not contribute to TSP?

You will not receive the agency match, which is essentially information programs. You are not required to contribute, but most financial advisors recommend contributing at least 5 percent to capture the full match. If you contribute nothing, you forfeit that benefit.

Can I move money from TSP to an IRA or 401(k)?

Yes, you can roll your TSP balance into a traditional IRA or a Roth IRA (if you have Roth TSP money). You can also roll it into a 401(k) if your new employer's plan accepts rollovers. The rollover is not taxed as long as you move the money directly from TSP to the new account.

Is TSP the same as Social Security?

No. TSP is a retirement savings account you build with your own contributions and your employer's match. Social Security is a separate federal benefit based on your work history. Federal employees receive both, though some receive a reduced Social Security benefit if they did not pay into it for most of their career.