The iampf is a complete disaster. every 8 years if has to hose the members to keep it solvent. It created a b scale in 2003 for the unborn, then abolished the A scale in 20l11 (effective 20l4), and just using the current math, as represented on the annual funding statements, its going to have to do something again in 2019. Of course the problem is that out of over 200,000 participants, only 75,000 are paying into it. When it makes changes, the funding usually boost to around 110% and the I Am Management group claims its fully funded. The problem is that it lose 2% a year and is now down to 101% funded (as of 2015). Once if gets into the mid 90s it will boost the fund again. Guess who pays?
Defined benefit plans are a complete disaster and dinosaur. Nobody in their right mind would want to be in one.