“Now that the Affordable Care Act has made health care a tax issue, no one can understand it,†H&R Block flatly tells taxpayers in a video that resides on its dedicated Obamacare web site. A former IRS Commissioner agrees, and cautions that the new tax requirements will be a “shock to the system,†especially afflicting low-income earners who have never itemized on their tax return.The tax preparation giant — with 24 million tax clients worldwide — reports that the Obamacare tax rules now constitute “the biggest tax code change in the last 20 years.â€The company is so concerned, it has...