Here's how to calculate how much money you need 'for the rest of your life' after retire - Deepstash
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How much money would you need to retire today and never have to work again?

If you’re planning to retire at 65, that figure may seem distant and amorphous. You’re saving as much as you can today so that you can enjoy life as much as possible when you eventually leave your job.


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For adherents to the financial independence, retire early , or FIRE, movement, that figure is much more concrete. “Your FIRE number is the amount of money you need to live on for the rest of your life,” says Grant Sabatier , creator of financial site Millennial Money and the author of “Financial Freedom.”

For many aspiring early retirees, calculating that number comes with an easy shorthand: “The way you calculate your FIRE number is multiplying your expected annual expenses by 25x,” says Sabatier, who reached financial independence at 30 . “Meaning if you spend $40,000 a year, multiplying that $40,000 by 25 would get you to a million dollars.”


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As with any other one-step financial calculation, the FIRE number math is based on several assumptions and will vary based on your financial situation. Here’s what retirement experts say you need to know to figure out how much money you’ll need to retire.


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The math behind the FIRE number calculation

The FIRE number calculation is rooted in the so-called “4% rule,” which was popularized in an influential 1998 research report known as the “Trinity study.” Included in the research was an examination of past market performance to determine a safe withdrawal rate in retirement.

The conclusion: In 99% of cases, retirees could withdraw 4% per year, adjusted for inflation, from a portfolio of stocks and bonds without running out of money.

When calculating your FIRE number, remember that the multiple of 25 is really just an easier way of dividing by a 4% withdrawal rate. Returning to to Sabatier’s earlier example, if you intend to spend $40,000 a year in retirement, divide by 0.04 to get to your million dollars.


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Additional Notes

Additional Notes

As Sabatier points out, some more recent studies suggest it may be wiser to aim for a lower withdrawal rate if you’re hoping for an extended retirement. Researchers at Morningstar peg the safe withdrawal rate at somewhere between 3.3% and 4%, accounting for factors such as relatively low yields in the bond market and relatively high valuations on stocks (which tend to dampen future returns).

If you do calculate your FIRE number and find yourself getting overwhelmed by a huge number, remember that you don’t have to get there all at once, says Sabatier.


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