> To simplify the US tax system, we first need to solve how we equitably fund local governments.

I agree differences between states drive much of the complication, with local jurisdiction taxes, such as in Ohio, adding much more complication. My political views fall more to the right than many HN participants, so I am slow to support the Federal government mandating sales tax changes. Do you have an opinion on the Streamlined Sales Tax Governing Board? streamlinedsalestax.org