<prompt> Human: My company has 401k after working there a year. My first paycheck to have 401k withholdings will be on October 15th. Id like to reach the max investment for the year 17,500, but this is impossible to do, even if I contribute 100 of my paycheck. What I want to know is this: Can I write a check for 17,500 from my savings to directly go into my 401k? Or, does it have to directly come from my paycheck?  <response>: 401k contributions must be made from your paycheck. 