http://finance.yahoo.com/news/13M-get-unexpected-tax-bill-apf-514145692.html?x=0
There was an article covering this back a ways, but figured I'd pass this along since now's when it's about to actually hit. For dual income homes (whether that's two people each working one job or one person working two or a SS person who works) this could be a problem come Jan 1st. If you're a DI home be prepared. You may owe on your taxes.