The answers in this thread are correct. I’m an HR Manager and, for us, 401k contributions are taken out of bonuses. You need to get with your HR department if you want to make a change to that whether you want to turn it on/off or adjust the contribution percentage.
This needs to be done a couple of days before payroll runs (or in this case when the bonus is paid out).
This post was edited on 8/25 at 8:57 am