2024 Roth Solo 401(k) Contribution Deadline (Employee Salary Deferral)

I have a client that has an existing Roth Solo 401(k) plan. The plan was first established for tax year 2023. When is the deadline for her to make her 2024 Roth employee salary deferral into her Solo 401(k) (up to $30,500). Is it 4/15/2025? She is a sole prop and files a schedule C.



The SE employee contribution for 2024 must be made by 4/15/2025. The employer contribution deadline is also 4/15, but 10/15 with a filed extension.

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