As far as I know, you cannot set one up by yourself as a W2 employee. Your group/company would need to set one up, and then the big hurdle becomes plan participation. This is why some plans lock in your contributions for the year or a few years. Cash balance plans have all sorts of federal regulations regarding discrimination testing and plan participation. If you don’t have enough people willing to put money in, or your company doesn’t want to make a contribution on behalf of most employees, then you can’t set one up. This is probably why it’s much easier to set up as a 1099.