Unexpected Christmas Bonus

I was notified that I will be getting an unexpected Christmas bonus of $500 on my next paycheck. Problem with bonuses is I would like to know how much of the bonus I am going to have after taxes. Just as I have found and use a payroll adjustments tool CalcXML Payroll Adjustments. I have also found a Bonus calculator to answer my question: How much will my company bonus net after taxes? The answer is at CalcXML with their Net Bonus Calculator. With this tool I was able to see how much of my bonus I am actually going to get and can plan to use it accordingly.