All-
I know that our union has provided us with ample smoke to help break down how our MBCBP would work. I have been reading about these plans in an effort to keep an open mind and educate myself. The IRS document below provides a GREAT explanation starting on page 9 of how a real life example would work for a 35 year old participant.

They do a better job here than any ALPA email I’ve read yet on the topic!

https://www.irs.gov/pub/irs-tege/epchd1104.pdf