Birchtree said:
Go 75% C fund and 25% I fund for the next three years and don't worry about all the volatility - you are not vulnerable.
TSPGirl,
Only you know whether or not you are vulnerable. Based on historical returns:
L 2040 fund - 10.1% annual return with a 95% chance that your returns will fall in the range of +38.5% and -18.1%. Could you stand losing 18% of your money in one year?
75% C and 25% I - 10.8% annual return with a 95% chance that your returns will fall in the range of 44.6% and -23%. Again, could you stand to lose 23% of your retirement in one year without panicking? I don't know if I could.
Both these portfolios are risky. However, the L2040 offers the advantage of being invested in all 5 funds. Consequently, whichever fund does the best, you'll have a piece of the action. I'd say there's at least a one in three chance that the S Fund will offer superior returns to the C & I funds over the next three years.
Another portfolio evaluation criteria is to select the portfolio with the highest Sharpe Ratio. Essentially, the Sharpe Ratio is a way of quantifying how much return you get for each extra unit of risk. The Sharpe Ratio for the L 2040 fund is .40. The Sharpe Ratio for the suggested 75/25, C/I fund portfolio is .43.
If the L 2040 fund is too risky, try the L 2030 fund.
Incidentally, the L 2040 fund would have returned 7.9% last year. The proposed 75/25 allocation returned 6.3%.
Finally, this thread contains a list of the top returns from last year. The L2040 fund is number nine on the list.
http://www.tsptalk.com/mb/showthread.php?t=2542