Comment: Hopefully this tax has an exclusion for S-corp businesses owned by a family as all profits are passed through on a K-1 to the individual's income and taxed as personal income already.  Imposing a tax on these small single individual / family businesses is essentially taxing them twice!  I'd simply shut down my S-corp and go to some other tax entity if that's the case though it would be unnecessarily time consuming.   

Also, keep in mind that if a business is selling goods that can also be purchased online the price difference could be enough to cause them to lose more buyers to internet purchases.