Yes, your TSP will continue to grow after you retire. Separating from federal service ends your payroll contributions, but every dollar already in the account stays invested and keeps earning market returns. As long as your vested balance is at least $200, the Thrift Savings Plan keeps your account open indefinitely and treats you the same as any other participant when it comes to investment choices and account access.1Thrift Savings Plan. TSP Summary – Withdrawals After You Separate Whether the balance actually rises year after year depends on your fund choices, how the markets perform, and how much you withdraw, including the mandatory withdrawals the IRS will eventually require.
How the Account Grows Without New Contributions
Growth after separation comes from two sources: market performance and reinvested earnings. Dividends from the stock funds and interest from the bond and government securities funds get folded back into your balance automatically, so gains compound on top of prior gains.
The math is straightforward. A $500,000 balance earning 5% adds roughly $25,000 in the first year. The next year’s return is calculated on $525,000, producing a larger dollar gain, and so on. Over a twenty-year retirement, compounding can offset a meaningful share of the withdrawals you take for living expenses, provided you do not pull out more than the account is earning.
Costs matter here too. The TSP’s net administrative expense ratios in 2025 were 0.033% to 0.034% across all individual funds, or about 34 cents per year for every $1,000 invested.2The Thrift Savings Plan (TSP). Expenses and Fees That is well below what most private-sector plans charge, and every fraction of a percent you do not pay in fees stays in the account compounding for you.
You Still Control the Investments
Retirement does not lock your allocation in place. Your money remains spread across whichever TSP funds you selected before separating, and you can change that mix at any time by logging in to My Account on tsp.gov. The TSP distinguishes between fund transfers, which move existing balances between funds, and reallocations, which change where future earnings go.3The Thrift Savings Plan (TSP). How to Change Your TSP Investments
You get two unrestricted transfers or reallocations per calendar month. After using both, any additional move that month can only shift money into the G Fund.3The Thrift Savings Plan (TSP). How to Change Your TSP Investments It is enough room to rebalance as conditions change without inviting short-term trading.
If you prefer a hands-off approach, the Lifecycle (L) Funds blend the five individual funds and automatically shift toward a more conservative mix each quarter as the target date approaches.4The Thrift Savings Plan (TSP). Lifecycle Funds The L Income Fund is built for retirees already drawing on their accounts, and when any dated L Fund reaches its target, its balance rolls into L Income. Many retirees gradually move a larger share into the G Fund or F Fund as they age, preserving capital they expect to spend soon while letting the rest ride in stock funds.
Required Minimum Distributions Will Eventually Shrink It
The IRS will not let tax-deferred money grow untouched forever. Federal law requires you to begin Required Minimum Distributions once you reach a certain age or retire, whichever comes later.5Office of the Law Revision Counsel. 26 USC 401 – Qualified Pension, Profit-Sharing, and Stock Bonus Plans The age depends on when you were born:
- Born 1951 through 1959: RMDs begin at age 73.
- Born 1960 or later: RMDs begin at age 75, effective for those reaching age 74 after December 31, 2032.5Office of the Law Revision Counsel. 26 USC 401 – Qualified Pension, Profit-Sharing, and Stock Bonus Plans
If you keep working for the federal government past that age, the clock does not start until the calendar year you actually separate. Someone who retires at 76 owes a first RMD for that retirement year, not retroactively for age 73.
How the Amount Is Calculated
The IRS divides your traditional TSP balance as of December 31 of the prior year by a life expectancy factor from the Uniform Lifetime Table.6Internal Revenue Service. Retirement Topics – Required Minimum Distributions (RMDs) A different table applies if your sole beneficiary is a spouse more than ten years younger. The result is the minimum you must withdraw that year. You can always take more, but not less.
Each RMD removes shares from the account. A $20,000 withdrawal from a $400,000 balance means future returns compound on $380,000 instead. As the life expectancy divisor shrinks with age, the required percentage grows, and RMDs become the main force working against continued growth.
Deadlines and Penalties
Your first RMD can be delayed until April 1 of the year after you reach the applicable age (or retire, if later). Delaying, though, creates a pileup: you owe two RMDs in that second year, which can push you into a higher tax bracket.7Internal Revenue Service. Retirement Plan and IRA Required Minimum Distributions FAQs Every subsequent RMD is due by December 31.
Miss an RMD or withdraw too little, and the IRS imposes a 25% excise tax on the shortfall. The penalty drops to 10% if you correct the mistake within two years.7Internal Revenue Service. Retirement Plan and IRA Required Minimum Distributions FAQs
The Roth TSP Exception
If any part of your TSP is in a Roth balance, one important rule works in your favor. Starting with tax year 2024, Roth TSP balances are no longer subject to required minimum distributions during your lifetime under the SECURE 2.0 Act.8The Thrift Savings Plan (TSP). SECURE 2.0 and the TSP Only your traditional balance counts toward the annual RMD calculation, and only traditional withdrawals satisfy the requirement.
Roth money can therefore sit in the TSP and compound without forced withdrawals eating into it. For a retiree who does not need every dollar right away, the Roth balance becomes the most efficient growth engine in the account.
Adding to Your Balance After Retirement
You cannot make new payroll contributions once you separate, but you can still increase the balance by rolling in money from other retirement accounts. The TSP accepts direct rollovers from traditional IRAs and from other employer plans such as 401(k)s, 403(b)s, and 457(b)s.9Office of the Law Revision Counsel. 5 USC 8432 – Contributions Roth money from a Roth 401(k), Roth 403(b), or Roth 457(b) can roll into your Roth TSP balance.10The Thrift Savings Plan (TSP). Move Money Into the TSP
One boundary catches people off guard: the TSP does not accept rollovers from a Roth IRA.10The Thrift Savings Plan (TSP). Move Money Into the TSP Roth IRA savings have to stay in a Roth IRA. The old paper forms are gone; rollover requests now start inside My Account on tsp.gov.11The Thrift Savings Plan (TSP). Forms and Resources Consolidating outside accounts puts more money under the TSP’s low expense ratios and gives compounding a bigger base to work on.
Keeping Growth Ahead of Withdrawals
The practical question for most retirees is whether market growth can outpace RMDs and living-expense withdrawals. In strong market years it easily can. In flat or down years the balance will shrink faster than expected. The levers you control are your fund allocation, the timing and size of any voluntary withdrawals beyond your RMD, and whether you roll in outside accounts to maximize the compounding base. Retirees who keep some stock exposure, hold voluntary withdrawals modest in the early years, and take advantage of the Roth TSP’s RMD exemption tend to preserve their balances the longest.