Solo 401k has been mentioned, and that is a good option if you have or could create some self employment earned income in order to qualify. I would also add that even if this is not the case today, investing in a 401k might still be a great idea ... in addition to the benefits already mentioned, if/when you do part ways with your current employer, then at that point the 401k could be rolled either into a solo 401k or if you don't qualify for that then into a IRA LLC with checkbook control, and then invested in REI, notes, etc. This is exactly what I did ... in fact it was a Roth IRA LLC, so tax free rental income and capital gains ... worked out great for me. So, the idea would be to build it up while you are employed with them, then later when you are not roll it into self directed and invest it in RE or whatever else you like in a tax advantaged manner. RE notes are a great option for those IMO ... even though I bought rental property, and it turned out great, if I had to do over again i'd likely lean towards notes with self directed retirement funds. Also, some employers offer self directed options where you can choose individual stocks .... maybe not with a TSP, but if you have this option then research dividend growth investing (DGI) ... similar to rental properties you can live off the stock dividends, never have to sell, and be less reliant on what happens to stock prices. Also like rental properties you can choose stocks with higher immediate dividend yield but slower growth, or lower immediate yield and higher growth in earnings, which in turn leads to higher capital gains and dividend growth ... you can also buy REITs in these plans.