Currently, I'm investing in my company's pre-tax retirement savings plan. I presently have a low income tax liability because I have 5 dependants (spouse and 4 children). My concern is how much I will be taxed when collecting during retirement. Due to my present low tax liability, is it worthwhile to invest 0-100% of my retirement investment to the after-tax plan? I would feel comfortable knowing the amount building the the plan is 100% covered from a tax perspective. Let me know your thoughts.