Possible Duplicate:
My bonus is taxed at a higher rate than my regular paychecks, so should I contribute 100% of my bonus to 401k?
Is there any tax advantage that I can gain if I invest my bonus into my 401k account, instead of using it as normal salary? For tax purposes, my status is married filing jointly with the tax bracket of 28% (according to 2010 tax brackets.)
The reason I am asking this is because if I want to use it as normal salary, the bonus will be taxed with the highest tax bracket of my income and adding the FICA & local taxes to that would take away a very big chunk of it (~35-40%).