I work part time for a company that has a 401k for me. I am still working for them. I will be 72 in April of this year. When and how much must I withdraw from the 401k?

[HelenC12]

Contact your 401(k) institution or administrator. They usually send you the Required Minimum Distribution (RMD) automatically or you may have to request it. 

Please see the following: IRS Retirement Plan and IRA Required Minimum Distributions FAQs.

[TomD8]

You may qualify for an exception from taking RMDs from your current employer-sponsored retirement account, such as a 401(k), 403(b), or small-business account, if:
- You're still working
- You do NOT own more than 5% of the business you work for
- You have an employer-sponsored retirement account with the business you work for.
If you meet all the criteria above, you may delay taking an RMD from the account until April 1 of the year after you retire. Keep in mind that this does not apply to IRAs or other accounts you may hold with companies you no longer work for.