Tsp charges you very lower fees compared to any other investment firm. Higher expenses are a massive drag on your investment return.
Here is an example
Let’s assume that you have 250000 invested, adding 18000 yearly and expecting an 8% gain. Tsp charges you 0.038 % of your account balance/year while the other firm charges you around 0.85 % or more.
You will end up paying 782,557.84 more in fees over 30 years when choosing non-TSP firms
Click on the image to see it larger.
Here is a link to the calculator so you can run your own numbers.
If you are not lucky enough to have TSP, then Vanguard is your next best option
Most of us lost money because we did not begin to invest. So any start is a good move.
Best book to read before you start investing.
I like audiobook versions of this book