Your TSP can keep growing after retirement if it stays invested, but the amount depends on your balance, withdrawals, fund mix, fees, and market returns. A rough example from a public calculator discussion shows that $300,000$300,000$300,000 growing at 10% a year with no contributions could reach $500,000$500,000$500,000 in about 5.36 years, but real retirement growth is usually slower because you are also drawing money out.

What drives growth

  • Investment returns: Higher stock exposure can mean more growth, but also more volatility.
  • Withdrawals: Taking money out reduces how much remains invested.
  • Fees and taxes: These can lower net growth over time.
  • Inflation: Even if the balance rises, buying power may not rise as fast.

Simple way to estimate it

You can think of post-retirement TSP growth like this:

  • Start with your current balance.
  • Subtract expected yearly withdrawals.
  • Apply an assumed annual return to what remains.

For example, if your account earns 6% but you withdraw 4%, the net growth is very different from a no-withdrawal scenario. A TSP growth calculator can model this more realistically than a simple rule of thumb.

Practical range

A cautious planning range many retirees use is:

  • Conservative: 3% to 4% annual return.
  • Moderate: 5% to 6%.
  • Aggressive: 7%+ with higher market risk.

That means your TSP might grow a little, stay roughly flat, or decline over time depending on how much you withdraw. The key question is whether your withdrawal rate is lower than your long-run return after fees and inflation.

Example

If you retire with $400,000$400,000$400,000:

  • At 5% growth, it may rise to about $420,000$420,000$420,000 after one year before withdrawals.
  • If you withdraw $20,000$20,000$20,000 that year, the ending balance could be much lower.
  • Over several years, the compounding effect becomes very sensitive to withdrawal size.

Best next step

The most accurate answer comes from your own numbers: current TSP balance, expected withdrawals, and fund allocation. I can estimate your TSP growth after retirement with a simple projection if you share those numbers.