<prompt> Human: This is a tax question.Hypothetical Scenario:Lets say I planned to contribute 5000 to my 401k this year. Lets also say I was guaranteed a 5000 bonus this year. Assumptions:I pay a significantly higher income tax rate on my bonus income rather than my regular income. Bonus is close to 50 tax so lets just use that as the rate.Questions:Does the bonus income hit my 401k pretax? So Id be getting the full 5000 in my 401k instead of the 2500 that Id be paid otherwise?When I withdraw funds from my 401k upon retirement, I need to pay taxes on the income, correct? Does the nature of the contributed income affect the taxes I need to pay? Meaning if all of my 401k contributions were 100 bonus related income, id need to pay more in taxes than if 100 of my 401k contributions were regular income?Anything I am missing here?edit: formatting  <response>: I pay a significantly higher income tax rate on my bonus income rather than my regular income.That is not correct. Your tax withholding is higher for your bonus check, but at the end of the year, you pay taxes based on your total income for the year. Does the bonus income hit my 401k pretax? So Id be getting the full 5000 in my 401k instead of the 2500 that Id be paid otherwise?Your 401k withdrawals are pre-tax, so your contribution as always is based on your gross pre-tax income. Meaning if all of my 401k contributions were 100 bonus related income, id need to pay more in taxes than if 100 of my 401k contributions were regular income?There is no difference between bonus and regular income. 