Before your employment ends, you'd have to set up an account with a company that offers rollover 401k or IRA accounts involving Bitcoin.

When your employment ends, they're pretty quick to ask where you want your funds moved. If you open one up ahead of time, you'll have the information to provide without having to scramble for it.

Then, you'll fill out the paperwork and have it moved over.

You'll get tax docs at the end of the year for both the closing out of the 401k you have now and the deposit and opening of the one you moved it to.

It feels wrong to close it out because we've had it drilled into our heads for decades, and we don't touch the money, so closing it out is always a mistake. It's the messaging behind it.

Someone can show you the math why this is, but future accumulated math doesn't always match boots-on-the-ground needs today.

I also want to say you can have payroll stop the current contributions to it and you can potentially withdraw or move the funds once that completes without having to end your employment. You'll have to check.