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Can expense ratios on investment options in a 401(k) plan contain part of the overall 401(k) plan fees?
There are several things being mixed up in the questions being asked. The expense ratio charged by the mutual fund is built into the NAV per share of the fund, and you do not see the charge explicitly  mentioned as a deduction  on your 401k statement (or in the statement received from the mutual fund in a non-401k situation). The expense ratio is listed in the fund's prospectus, and should also have been made available to you in the literature about the new 401k plan that your employer is setting up. Mutual fund fees (for things like having a small balance, or for that matter, sales charges if any of the funds in the 401k are load funds, God forbid) are different. Some load mutual funds waive  the sales charge load for 401k participants, while some may not. Actually, it all depends on how hard the employer negotiates with the 401k administration company who handles all the paperwork and the mutual fund company with which the 401k administration company negotiates.  (In the 1980s, Fidelity Magellan (3% sales load) was a hot fund, but my employer managed to get it as an option in our plan with no sales load: it helped that my employer was large and could twist arms more easily than a mom-and-pop outfit or Solo 401k plan could). A long long time ago in a galaxy far far away, my first ever IRA contribution of $2000 into a  no-load mutual fund resulted in a $25 annual maintenance fee, but the law allowed the payment of this fee separately from the $2000 if the IRA owner wished to do so. (If not, the $25 would reduce the IRA balance (and no, this did  not count as a premature distribution from the IRA). Plan expenses are what the 401k administration company charges the employer for running the plan (and these expenses are not necessarily peanuts; a 401k plan is not something that needs just a spreadsheet -- there is lots of other paperwork that the employee never gets to see). In some cases, the employer pays the entire expense as a cost of doing business; in other cases, part is paid by the employer and the rest is passed on to the employees.  As far as I know, there is no mechanism for the employee to pay these expenses outside the 401k plan (that is, these expenses are (visibly) deducted from the 401k plan balance). Finally, with regard to the question asked: how are plan fees divided among the investment options? I don't believe that anyone other than the 401k plan administrator or the employer can answer this. Even if the employer simply adopts one of the pre-packaged plans offered by a big 401k administrator (many brokerages and mutual fund companies offer these), the exact numbers depend on which pre-packaged plan has been chosen. (I do think the answers the OP has received are rubbish).