Taxpayers accustomed to filing a simplified 1040EZ will not be able to do so if they received health insurance tax credits this year. Some highlights: -- You may have heard that the IRS cannot use liens and levies to collect the law's penalty on people who remain uninsured. But there is no limitation on collection efforts in cases where consumers got too big a tax credit. If your refund isn't large enough to cover the repayment, you will have to write the IRS a check. "They are not messing around," Brandes said. For families, the cap is double the amount...