Well, the article points out that tax preparers are lobbying in favour of taxes being complex and hard to file.
Given a choice between a simple tax system that gave you a $100 rebate for doing nothing; and a complex tax system that gave you a $90 rebate if you brought their software or a $30 rebate if you did nothing; the tax preparer would prefer the latter system even though doing so would increase the tax their customers pay.
