No, there are no Roth income limits. A significant advantage to a Solo 401(k) and 401(k)s that offer Roth contributions.
The contributions must come from your self-employed income.
No, you can make as big of an after-tax contribution as you wish to the Solo 401(k) as long as you stay under the contribution limit. However, keep in mind all matching contributions must be pre-tax.
To make Roth contributions, you must have a trust and then trust bank account for ONLY Roth contributions. You must not commingle Roth and Traditional dollars.
Functionally, you will open two trusts and two bank accounts connected to those trusts at our partner bank. You must name the accounts appropriately. You will be working with our support team, so please call if you have any questions or concerns.