<prompt> Human: The 401k plans of my current employer are managed via Fidelity and the website allows me to configure how much of my monthly salary Id like to use for 401k contributions.Id like to max out the yearly 17,500 limit, but the percentage of salary configuration makes this somewhat hard, especially as changes to the contribution arent active immediately, but only after a few paychecks.The ideal setup for me would be if my employer just contributes 100 of my paychecks to the 401k plan each year, until the 17,500 limit is reached at which point the contribution switches to 0. Is something like this possible?Or can I manually transfer money to my 401k plan and then get back the paid tax for that money on my next tax return?  <response>: I calculated what would max me out, and at end of year, if my last contribution would have brought me over the limit, the system in use by payroll automatically prevented this from happening, so I never had to worry about it. Ask at work if this is true. I would expect this is a common question and they probably have things set up to take care of this. Though you may be surprised to learn that you are in a minority by actually reaching the max. Also, if you get raises, be sure to adjust your contrib percentage down to avoid maxing out early, if you work where they match only to paychecks you make contributions from, to maximize your match. 