I see the same thing with my bonus. I get a separate bonus check, but dated the same as my last paycheck in December. I always figured they withheld Fed taxes on it as if it were a regular paycheck. But if that were my regular paycheck, I would be in a much higher tax bracket so I expect the withholding to be significantly higher for the bonus check.
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2010 Platinum Graphite 370z Roadster:Touring/Sport
2013 Subaru BRZ Limited
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