From ThinkProgress:
In fact, the Economic Policy Institute found that Romney’s plans would actually lead to a net loss of jobs over the first two years of his administration, and the losses could grow even larger if Romney were to stick to his promise of reaching a balanced budget.
EPI had to make assumptions about Romney’s plan because of its lack of specificity, but according to its analysis, Romney’s plan to lower taxes and cut spending would cause a net loss of 554,000 jobs over the next two years if Romney abandons his plan to pay for the massive tax cuts he has promised. But if he maintains his promise to balance the budget while also providing the huge tax cuts, his plan would “lead to employment losses of 608,000 in 2013 and roughly 1.3 million in 2014″
(7)