S corporations will pay the highest average effective tax rate in 2013 (31.6% of their income), reveals a study from the National Federation of Independent Business and the S Corporation Association.

Pecking order: The study, by Quantria Strategies, compares the tax burden different business entities will shoulder in 2013. After S corps, partnerships will pay the next highest effective tax rate (29.4%), followed by C corporations (17.8%) and sole proprietorships (15.1%).

This is only the second time the tax burden of S corps and other pass-through entities has been measured.

Speaking of S corps: In pass-through entity valuation, confusion remains despite voluminous dedication to a single, simple approach. Perhaps no expert has dedicated more research, thought, and experience to this pursuit than Nancy Fannon (Meyers, Harrison & Pia). On September 12 in S Corps … What a Long, Strange Trip It's Been, Fannon joins BVR to examine how academic research, appraisal experience, and judicial opinion can be synthesized to create an effective, reliable, and defensible technique for pass-through entity valuation.