Darren is eligible to contribute to a traditional 401(k) in 2018. He forgot to contribute before year-end. If he contributes before April 15, 2019, he is allowed to treat the contribution as though he made it during 2018.

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Quizplus · Accepted Answer

This is true. The IRS allows for contributions to a traditional 401(k) to be made up until the filing deadline, including extensions, to count towards the previous year's contribution limit. So if Darren missed the deadline to contribute for 2018, he can still make a contribution up until April 15, 2019 and have it count towards his 2018 contribution limit.

Darren Is Eligible to Contribute to a Traditional 401(k) in 2018