calteg said:
SKJSS (formerly Klayfish) said:
In reply to OHSCrifle :
How do you determine that number?
Oversimplified answer:
Create a detailed budget, approximating your monthly spending in retirement
Multiply that x12 to get yearly spending (again, in retirement)
Multiply that x25. 1/25 = 4% so multiplying by 25 gives you your nest egg needed to sustain 4% withdrawal rate
Now that you have a target "nest egg" number, you can use one of the many calculators online to determine if your current investments are likely to get you there. Essentially you're answering the following: With X years to retirement, assuming average market returns, will my current investment of Y get to my nest egg number if I contribute $0 going forward?
The famous 4.0% Rule referenced above assumes that you begin retirement at age 65. For an earlier retirement, you'll need to reduce the draw rate slightly.
Here's one 4.0% Rule chart for various timelines, draw rates, & allocation mixes:
If your objective is simply to avoid running out of money before you die, a start is to visit the Social Security Administration's Actuarial Table.
What isn't available is the standard deviation on life expectancy...for a 60 year old male, it's 9.1 years...I know that because I'm a 60 year old male statistician.
If you take the life expectancy for your age and gender from the table and add 9.1 years, there's ~83.5% chance you won't live longer than that and if you add 18.2 years, there's ~97.5 chance you won't live longer than that.
Of course, the standard deviation varies as a function of age and gender and we're not considering the shape of the distribution. But, if you start with this estimate and push the number up or down in consideration of family longevity, life style, and current health, you'll get the numbers almost as tight as they can get.