You are correct. The Maximize function for an individual 401(k) contribution does not account for elective deferrals or Roth contributions to other 401(k) plans. You can select the Maximize function for a SEP or profit sharing plan to allow TurboTax to calculate the maximum employer contribution to the individual 401(k) and then explicitly enter the permissible amount of individual elective deferral or Roth contribution, taking into account those at your other employer.
