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Can I make a 401(k) contribution for the 2017 tax year in March 2018, and is that contribution deductible for the 2017 tax year?

What are the deadlines for making contributions to a 401(k)? Now that it is March 2018, can I make a contribution to my 401(k) for tax year 2017? If I can make a 401(k) contribution for the 2017 tax year, will that contribution be deductible for the 2017 tax year?

401(k), Taxes
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March 2018

Unlike IRA's, 401k contributions must be made by the end of the year.  Therefore, you can't make a 2017 401k contribution in March 2018.  Again, you can make a Traditional or Roth IRA contribution until April 17, 2018, for the 2017 tax year.

Thanks for the question!

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