Obviously the interest in bitcoin will decrease if it's heavily taxed, and nations that tax bitcoin transactions heavily will see less use of bitcoins. (politics.stackexchange.com)
On a political level one or two big countries taxing bitcoin could, theoretically, drop the bitcoin's value by a disproportionate amount. (politics.stackexchange.com)
That taxation question is an open one, and statement suggests that that private - sector input will be solicited and that approaches in use by other governments — the U.S. Internal Revenue Service taxes bitcoin as a form of property, for example — are up for consideration as well. (links2exchange.net)