Well they base the limit on projected income. For MDs they use projected income after residency and they have a figure of over 200gs. For PAs there is no real data on this so they took the minimum amount that the Govt is allowing PAs to be paid (75gs) and used that. This is not appropriate, however, as the majority of PAs make much more than that and the limit based on income should really be about 100gs. But it will take time for RBC to have confidence in this.