I don't think that if the plan has an effective date of 6/1/18, you can go back to 1/1/18 to use the entire years compensation. Anyone who satisfied eligibility as of the plan effective date enters 6/1 and compensation is used from that date. If I wanted to use the entire year compensation, I used a 1/1/ effecitve date. Does anyone else have thoughts about being able to use/not use comp before effective date of plan?