(CNN) — 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.

Congressional Republicans sought to fulfill President Donald Trump’s “no tax on overtime” campaign promise in their One Big, Beautiful Bill , which Trump signed into law in July. But the measure doesn’t actually exempt all overtime pay from federal income taxes.

Notably, only the earnings in excess of one’s standard hourly wage will be tax free. In other words, for those who earn time-and-a-half when working overtime, only the “half” will not be subject to tax.

“When you first hear that overtime won’t be taxed, most people would think it’s the whole amount in that bucket,” said Tom O’Saben, director of tax content and government relations at th

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