Got a 15k promotion increase in salary

I recently got a 15k promotion increase in salary, but my bi-weekly paycheck increase (after taxes, 401k, etc.) comes out to an increase of 291 dollars, or 7k a year. Is that right? So taxes took out half of that increase...?

Also, I got a bonus of 4950, but in reality I got 2,477 which is also around half.

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