An employee pushes shopping carts outside a Costco Wholesale warehouse store in Hawthorne, California, on August 27.
Mandatory Credit:	Patrick T. Fallon/AFP/Getty Images via CNN Newsource

An employee pushes shopping carts outside a Costco Wholesale warehouse store in Hawthorne, California, on August 27.
Mandatory Credit: Patrick T. Fallon/AFP/Getty Images via CNN Newsource

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Think all your overtime pay will be tax free? Think again

Many Americans who work overtime will get a break on their taxes for the next few years — but it may not be as hefty as they think.