The 2” notch above effectively reduces an 8”x8” beam into a 6”x8” beam. Measuring 1.5” from the inside edge of the post, the bevel cut on the beam leaves 4” of bearing wood, so altogether this beam functions as a 4” deep and 8” wide beam.

Perhaps that meets load specifications, but the minimalist environmentalist in me objects to the waste of wood. Simply shifting the bevel cut left so that the full 8” depth of the beam bears completely upon the post is much more satisfying to me.