No, with regard to the $18,000 limit (plus $6,000 catch-up if age 50 or over), TurboTax's Individual 401(k) Maximize function cannot account for elective deferrals or Roth contributions that you made to another employer's plan. You'll have to manually calculate and enter your permissible elective deferral or Roth contribution to your Individual 401(k), then indicate that you made a contribution to a Keogh plan and mark the Profit Sharing Keogh Maximize box to allow TurboTax to calculate only the permissible employer contribution.
