snowman wrote:There is a contribution form on their website you can download and you fill it out every time you make a contribution. Keep a copy for your records.
1. At this point in time, deposits into solo 401k can only be made via paper check (mail it or in person at your local branch).
2. Fidelity does not care about your SE taxes.
Call Fidelity rep, they will walk you through the process.
+1. I was using Fidelity's solo-401k until 2011 (since 2005). You always had to fill a contribution form with a paper check. Also, although the form asks for employee contributions and employer contributions separately, Fidelity were not actually keeping track of it.
I have been using Vanguard's Individual 401k since 2012, which has a quite functional interface to make online contributions and keeps history of past contributions (with per employee, employer/employee breakdown). Of course, it has other limitations like not accepting rollover IRA's (Fidelity allows it).
Regardless, Fidelity or Vanguard don't care about your SE taxes.