A bonus you receive from an employer is not considered a luxury. Luxury tax is something that may be imposed in certain countries on a non essential luxury item, such as an expensive car or jewelry.
Your bonus check is considered by the IRS to be supplemental wages. In other words, it is a larger one time lump sum payment than what you would get on your normal paycheck. Most employers tax supplemental pay using a flat federal withholding rate of 25% although they could also continue to figure withholding based on how you have filled out your current W-4 form.
In addition to the federal withholding, SS and Medicare taxes will still apply for a total of 7.65%. So if your employer chooses the 25% federal withholding method and then withholds another 7.65% to cover SS and Medicare taxes, they should withhold a total of around $1,306 from this bonus.
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Thank you jenny