<prompt> Human: Hello, I was curious if anyone had any advice regarding increasing the amount of contributions to a 401k retirement account while working overtime for a specific pay period. I ask this because I lose quite a bit of money to taxes while working above 40 hours during a mandatory overtime shift. Essentially, will increasing my contribution from 5 to 10 during this pay period be worth it in regards to taxes. FYI my company does a match at 4 for 5.  <response>: Your taxes are withheld at a higher rate when you work overtime because the payroll system thinks thats an average paycheck for you and youll get that same check every pay period all year. Your tax liability changes very little from one pay period of overtime, and youll get this money refunded after filing your tax return. 