D, as your basic FERS annuity you will get 1% of your high-3 multiplied by years of service. (This is the 1% they take out every check.) After 30 years, you have 30%. You will get SS which will be about 20-25%. Adding, we get 50-55% from these two sources.
To get to 80%, we need 80 minus 50=30% from your TSP. Assuming you want to leave the principle amount intact, and use only the interest or earnings, and that thiswill be about 5% annually,that gives us the equation 5% of TSP = 30% of your high-3. Thus, TSP = 6 times high-3.
That means if you have six years income in your TSP on the date you retire, you will have reached your goal. If you think earnings will be better, say 8% rather than 5%, then four years income will suffice.
Right now I have twotimes my base pay in my TSP. My goal is to get that up to four, but my income keeps increasing!
Dave
PS -- If you are contributing 15% of your base pay now, and then maybe some additional catch-up contributions later on, you already AREliving on 80% of your pay, and thus will suffer no diminution of life style.
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