I don't think so. Not being taxable is the one of the thing I like about bitcoin. The government can't get to us, the bank can't to us. Everything here is done by user to user.
Bitcoin may not be taxable directly, but the profits earned with it definitely are. In most countries you will have to pay an income tax on such earnings. Whether they will be able to catch you for tax evasion if you don't pay this tax is another matter, but in the US you'd better not look that way. The IRS is no fun to play with.