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The age and tenure of 401(k) participants who contributed to the same plan over an eight-year period had a significant impact on their account balance over time, according to an analysis conducted by the Employee Benefit Research Institute. The longitudinal analysis, which studied 401(k) participants who were consistent contributors to a plan from 2010-2018, highlights the 'accumulation effect' of ongoing 401(k) participation.
Over the term of the study, the average balance of 401(k) plans of consistent participants increased 183 percent from $63,756 to $181,492, resulting in a compound annual average growth rate of 13.9 percent.
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