My employer has a mandatory retirement plan, which automatically holds 5% of my paycheck and sends it to a 403b based account with TIAA. In addition, employees can withold an additional amount via a separate supplemental plan (which is a separate account in TIAA, but also a 403b based account).
I want to max out my 19k allowance for 2019 by contributing as much as I can to the supplemental plan. Should I take into account the mandatory amount already contributed? Or because it is mandatory it is technically not an ELECTIVE deferral and I can contribute the full 19k via my supplemental plan.
