As mentioned earlier, a helpful rule of thumb is the "4% rule," which says your retirement savings will need to be large enough for you to withdraw 4% per year. In other words, your nest egg needs to be 25 times the amount you'll withdraw the first year. In each successive year, your withdrawal amount may be increased by inflation.
In the previous example, we used this concept to show that someone anticipating $50,000 in annual living expenses would need to accumulate $1.25 million. If your expectations for annual expenses in retirement aren't quite so frugal -- the median U.S. household income is now closer to $80,000 per year -- you may need to accumulate even more.
Let's use $1.25 million as a starting point, along with the next question: When do you want to retire?
If someone who's 25 wants to retire at 40 with a $1.25 million nest egg, they'd have to stick $83,000 per year in a savings account at current interest yields. Needless to say, that's out of reach for many people who don't earn a significant income.
However, there are ways to boost how much you save and to maximize how much your savings grow so you're not doing all the hard work on your own. And remember, FIRE is far from an all-or-nothing proposition. Even reaching 50% of your FI goal is a tremendous accomplishment and will earn you a significant amount of financial flexibility.
Of course, these are simple numbers to illustrate the point: Saving a lot of money is much harder than growing wealth by investing a portion of that savings over the long term. And, perhaps a more salient point: Investing as much money as you can -- as soon as possible -- will pave the way toward financial freedom.
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