“Enough” is perhaps the centrally important concept to early retirement.

Calculating it with some degree of accuracy is critical for everyone, especially when we’re talking about much longer retirements than most traditional retirement advice is based on.

If you already have your “enough” number in mind, then consider this a method of pressure testing your thinking to ensure you have adequate wiggle room built in. And if you’re just starting your planning, this will help you think about the key factors that determine how much you’ll want to save before you pull the plug.

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