Level 1
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Retirement tax questions

 
Level 2
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Retirement tax questions

Unfortunately, you can’t do this.  Elective deferrals for the 2017 tax year aren’t allowed after December 31, 2017. 

Employer-sponsored 401(k) plans are administered on a calendar-year basis, and contributions must be made within the calendar year.  Any contributions made after 2017 will apply to tax year 2018.