<prompt> Human: Would it be risky to use all 24 pay periods to max my 401k if the last one is so late in Dec 28th? Contributions usually take a few days to hit my account, but Im assuming the money is sent the 28th and would therefore be fine?Assistant: I believe the official pay date is what matters.Human: Awesome. Happen to have a link for that?  <response>: Its all about pay date. When you receive your W2 it will include this last contribution regardless of when the funds actually get invested. 