Compound interest doesn't stop when you retire. Keeping part of your savings invested can help your money last longer and reduce the risk of outliving it.
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Younger investors are in the "accumulation phase". Retirees shift to the preservation phase, where the goal is to keep earning returns while protecting capital.
Even in retirement, your investments can keep compounding if you:
Say you retire with $500,000 and withdraw $20,000 a year. With no growth at all, the money would run out in 25 years.
Keep it invested at 5% a year instead and, because you're withdrawing less than it earns, the balance keeps growing rather than running down. In practice inflation, fees and market ups and downs make things less smooth, which is why many retirees plan around a conservative withdrawal rate.
Even in retirement, compound interest can stretch your savings further. Keeping money invested sensibly and withdrawing at a sustainable rate can help you enjoy retirement with less financial stress.