401(k) plan
US /ˌfɔːr əʊ wʌn ˈkeɪ plæn/
UK /ˌfɔːr əʊ wʌn ˈkeɪ plæn/

1.
plan 401(k)
a retirement savings plan in the US that allows employees to invest a portion of their salary before taxes are taken out, with the employer often matching a portion of the contributions
:
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I need to increase my contributions to my 401(k) plan.
Je dois augmenter mes cotisations à mon plan 401(k).
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Many companies offer a matching contribution to their employees' 401(k) plans.
De nombreuses entreprises offrent une contribution de contrepartie aux plans 401(k) de leurs employés.