It won't be optional. The IRS doesn't like the complexity of not pooling the funds and opting in and out annually. This begs the question, can it be done fully funded by the company? 16% discretionary and up to the pilot after the cap just as we have now so you can continue to manage 401k and current percentage as we always have. On top of that 4% contributed automatically as an imputed income benefit. It could work like a conventional pension owned by the individual and managed by a third party with no further employer obligation beyond funding.