Tick, tock...tick, tock... Second by second, we get closer to plunging over the fiscal cliff. The hefty dollar tax impact of this witch's brew of tax hikes and federal government spending cuts is spelled out in a new analysis by the Tax Foundation. The conservative tax-reform group dissects the fallout from expiration of Bush and, yes, Obama tax cuts. The latter cuts included such things as the American Opportunity Tax Credit. That expanded the