As an early retired federal employee, I'm becoming more and more interested in the G Fund within the TSP as a way to support a very long, risk-free retirement. The G Fund is interesting to me because while it does not provide a high return relative to stocks/etc., it provides a 100% risk free (short of the U.S. Government going out of business, which I am not interested in discussing or debating) and non-volatile return that has consistently outpaced inflation since its inception in 1987. The rate of return is set to keep pace with medium-term U.S. treasury bonds, and can never be negative. These are the historical returns per the TSP web site:
1-Year = 2.31%
3-Year = 1.89%
5-Year = 2.18%
10-Year = 3.19%
Since 1987 = 5.43%
It seems that the G Fund generally outpaces inflation by about 2% over the long run. Therefore, assuming a 2% real return, you could construct the following rock solid withdrawal rates, drawing your account down to Zero, with no volatility along the way and no risk of ever losing principal (other than the principal you withdraw).
30 Year Withdrawal to Zero: 4.5%
35 Year Withdrawal to Zero: 4%
40 Year Withdrawal to Zero: 3.7%
Some might say, "Big Deal" about the above withdrawal rates and compare them to the standard 3-4% SWR. But the "big deal" about this (to me, at least) is that you can get a 3.7 - 4.5% SWR with zero exposure to market ups and downs, zero chance of running out of money no matter what future market conditions might prevail, and zero risk of inflation eroding your purchasing power (because the G fund should always stay ahead of inflation by about 2%, by definition). The only risk is outliving your forecast withdrawal period (for example, if you greatly outlive your life expectancy in the examples above). If you live under the life expectancy, you leave an inheritance to your heirs (unlike the basic TSP annuities).
I think I'm going to follow the TSP Lifecycle "Income" fund very closely, which is 80% G Fund and the other 20% divided between bonds and stocks (F, C, S, and I funds). Even though that Income Fund is geared towards people closer to traditional retirement age, I see no reason not to take advantage of the kick-ass G Fund as an early retiree. Why take higher risks with a bunch of exposure to stocks when you can guarantee outpacing inflation and never lose principal along the way?
In my case, I'll start withdrawing around age 54 (living off other non-TSP assets in the meantime) and target a 35-year withdrawal. On the unlikely chance I live past age 89, I'll have plenty of income available from the pension and Soc. Sec.
Thoughts? And is this the same as other Treasury Funds that anyone can purchase, or is the G Fund "special"?