W-2's in 2011 will include Obamacare Health care costs as income
that is excludable from the employee's gross income (excluding the value of contributions to flexible spending arrangements)."
It doesn't matter if you're retired. Your gross income WILL go up by the amount of insurance your employer paid for. So you’ll be required to pay taxes on a larger sum of money that you actually received. Take the tax form you just finished for
2009 and see what $15,000.00 or $20,000.00 additional gross income does to your tax debt. That's what you'll pay next year. For many it puts you into a much higher bracket. This is how the government is going to buy insurance for fifteen (15) percent that don't have insurance and it's only part of the tax increases, but it's not really a "tax increase" as such, it a redefinition of your taxable income.
But also adjust your tax withholding, or increase your savings, so that you aren't surprised and put in a jam when your federal income taxes are due on April 15, 2012.